{"id":45,"date":"2023-10-14T21:23:01","date_gmt":"2023-10-14T13:23:01","guid":{"rendered":"https:\/\/leezp.top\/?p=45"},"modified":"2024-10-15T13:38:24","modified_gmt":"2024-10-15T05:38:24","slug":"%e4%bd%bf%e7%94%a8python%e5%81%9a%e7%ac%94%e8%af%95%e9%a2%98%e7%9a%84%e6%8a%80%e5%b7%a7%ef%bc%88%e7%89%9b%e5%ae%a2%e7%bd%91acm%e6%a8%a1%e5%bc%8f%ef%bc%89","status":"publish","type":"post","link":"https:\/\/leezp.top\/?p=45","title":{"rendered":"Python\u57fa\u7840\u77e5\u8bc6\uff08\u673a\u8bd5\u590d\u4e60\u7528\uff09"},"content":{"rendered":"\n

\u7528Python\u505a\u673a\u8bd5\u9898\u7684\u4e00\u4e9b\u57fa\u7840\u77e5\u8bc6<\/p>\n\n\n\n

\u8f93\u5165\u8f93\u51fa\u90e8\u5206<\/h2>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
import<\/span> sys<\/span><\/span>\n<\/span>\n# \u5b9a\u884c\u8f93\u5165<\/span><\/span>\nfor<\/span> i <\/span>in<\/span> <\/span>range<\/span>(n):<\/span><\/span>\n    line = sys.stdin.readline().strip() <\/span># \u6bcf\u6b21\u4ec5\u8bfb\u53d6\u4e00\u884c\uff0c\u522b\u5fd8strip\u53bb\u9664\u6700\u540e\u56de\u8f66<\/span><\/span>\n    <\/span><\/span>\n# \u4e0d\u5b9a\u884c\u8f93\u5165<\/span><\/span>\nfor<\/span> line <\/span>in<\/span> sys.stdin: <\/span>#\u4f1a\u4e00\u76f4\u8bfb\u5230\u8f93\u5165\u7ed3\u675f\uff0c\u522b\u5fd8strip\u53bb\u9664\u6700\u540e\u56de\u8f66<\/span><\/span>\n    str_in = line.strip()<\/span><\/span>\n<\/span>\n# input\u8f93\u5165<\/span><\/span>\nfor<\/span> i <\/span>in<\/span> <\/span>range<\/span>(n):<\/span><\/span>\n    str_item = <\/span>input<\/span>().strip()  <\/span># input()\u8bfb\u53d6\u5230\u7a7a\u683c\u548c\u56de\u8f66\u90fd\u8ba4\u4e3a\u662f\u5206\u9694\u7b26\uff0c\u522b\u5fd8strip\u53bb\u9664\u6700\u540e\u56de\u8f66<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u6570\u636e\u5904\u7406\u90e8\u5206<\/h2>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
# \u79fb\u9664\u5b57\u7b26\u4e32\u5934\u5c3e\u6307\u5b9a\u7684\u5b57\u7b26\u6216\u5b57\u7b26\u5e8f\u5217(\u9ed8\u8ba4\u4e3a\u7a7a\u683c\u6216\u6362\u884c\u7b26)\uff0c\u8fd4\u56de\u751f\u6210\u7684\u65b0\u5b57\u7b26\u4e32<\/span><\/span>\nstr1 = str_in.strip()<\/span><\/span>\n# \u53bb\u9664\u9996\u5c3e\u5b57\u7b26\u4e3201<\/span><\/span>\nstr2 = str_in.strip(<\/span>"01"<\/span>);  <\/span><\/span>\n<\/span>\n# \u901a\u8fc7\u6307\u5b9a\u5206\u9694\u7b26\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5207\u7247\uff0c\u8fd4\u56de\u5206\u5272\u540e\u7684\u5b57\u7b26\u4e32\u5217\u8868<\/span><\/span>\nstr_list = str_in.split(<\/span>" "<\/span>) <\/span><\/span>\n<\/span>\n# \u4f7f\u7528map\u5bf9\u5217\u8868\u8fdb\u884c\u5904\u7406,\u4f1a\u6839\u636e\u63d0\u4f9b\u7684\u51fd\u6570\u5bf9\u6307\u5b9a\u5e8f\u5217\u505a\u6620\u5c04\uff0c\u5728Python3\u4e2d\u8fd4\u56de\u8fed\u4ee3\u5668\uff0c\u6545\u9700\u8981\u518d\u8f6c\u6362\u6210\u5217\u8868<\/span><\/span>\nint_list1 = <\/span>list<\/span>(<\/span>map<\/span>(<\/span>int<\/span>,str_list))<\/span><\/span>\n# \u4e5f\u53ef\u4ee5\u4f7f\u7528lambda\u8868\u8fbe\u5f0f\u6765\u8fdb\u884c\u66f4\u590d\u6742\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u8f6c\u6362\u4e3a\u6574\u6570\u540e\u518d\u5e73\u65b9<\/span><\/span>\nint_list2 = <\/span>list<\/span>(<\/span>map<\/span>(<\/span>lambda<\/span> <\/span>x<\/span>:<\/span>int<\/span>(x)**<\/span>2<\/span>, str_list))<\/span><\/span>\n<\/span>\n# \u8fdb\u5236\u8f6c\u6362\uff1a\u5176\u4ed6\u8fdb\u5236\u5b57\u7b26\u4e32\u8f6c\u5341\u8fdb\u5236<\/span><\/span>\nint1 = <\/span>int<\/span>(<\/span>'0xA'<\/span>,<\/span>16<\/span>) <\/span># 10<\/span><\/span>\nint2 = <\/span>int<\/span>(<\/span>'1001'<\/span>,<\/span>2<\/span>) <\/span># 9<\/span><\/span>\nint3 = <\/span>int<\/span>(<\/span>'17'<\/span>,<\/span>8<\/span>) <\/span># 15<\/span><\/span>\n<\/span>\n# \u8fdb\u5236\u8f6c\u6362\uff1a\u5341\u8fdb\u5236\u8f6c\u5176\u4ed6\u8fdb\u5236\u5b57\u7b26\u4e32<\/span><\/span>\nstr_hex = <\/span>hex<\/span>(<\/span>15<\/span>) <\/span># 0xf<\/span><\/span>\nstr_bin = <\/span>bin<\/span>(<\/span>2<\/span>) <\/span># 0b10<\/span><\/span>\nstr_oct = <\/span>oct<\/span>(<\/span>7<\/span>) <\/span># 0o7<\/span><\/span>\n<\/span>\n#\u5bf9\u6570<\/span><\/span>\nimport<\/span> math<\/span><\/span>\nmath.log(<\/span>2.7<\/span>) <\/span>#\u5e95\u6570\u9ed8\u8ba4e<\/span><\/span>\n<\/span>\n# ASCII\u7801\u4e0e\u5b57\u7b26\u76f8\u4e92\u8f6c\u6362: ord()\u83b7\u53d6ASCII\u7801\uff0cchr()\u8f6c\u5b57\u7b26<\/span><\/span>\nprint<\/span>(<\/span>"a\u7684ASCII\u7801\u4e3a"<\/span>, <\/span>ord<\/span>(<\/span>'a'<\/span>))<\/span><\/span>\nprint<\/span>(<\/span>"101\u5bf9\u5e94\u7684\u5b57\u7b26\u4e3a"<\/span>, <\/span>chr<\/span>(<\/span>101<\/span>))<\/span><\/span>\n<\/span>\n# \u6d6e\u70b9\u6570\u8f6c\u6574\u578b<\/span><\/span>\n<\/span>\n# int \u54110\u53d6\u6574<\/span><\/span>\nint<\/span>(-<\/span>0.5<\/span>)  <\/span># 0<\/span><\/span>\nint<\/span>(-<\/span>0.9<\/span>) <\/span># 0<\/span><\/span>\nint<\/span>(<\/span>0.5<\/span>)  <\/span># 0<\/span><\/span>\nint<\/span>(<\/span>0.9<\/span>) <\/span># 0<\/span><\/span>\n<\/span>\n<\/span>\n# round \u56db\u820d\u516d\u5165\uff0c\u4e94\u5411\u5076\u53d6\u6574<\/span><\/span>\nround<\/span>(<\/span>0.5<\/span>)  <\/span># 0<\/span><\/span>\nround<\/span>(<\/span>0.6<\/span>)  <\/span># 1<\/span><\/span>\nround<\/span>(<\/span>1.5<\/span>)  <\/span># 2<\/span><\/span>\nround<\/span>(-<\/span>2.5<\/span>) <\/span># -2<\/span><\/span>\nround<\/span>(-<\/span>1.4<\/span>) <\/span># -1<\/span><\/span>\nround<\/span>(-<\/span>1.6<\/span>) <\/span># -2<\/span><\/span>\n<\/span>\nimport<\/span> math<\/span><\/span>\n# math.floor \u5411\u4e0b\u53d6\u6574\uff08\u5411\u6570\u8f74\u8d1f\u65b9\u5411\uff09\uff08\u4e0e\u6574\u9664\u7b26\u53f7\/\/\u4e00\u6837\uff09<\/span><\/span>\nmath.floor(<\/span>0.9<\/span>)  <\/span># 0<\/span><\/span>\nmath.floor(-<\/span>0.9<\/span>)  <\/span># -1<\/span><\/span>\n<\/span>\n# math.ceil \u5411\u4e0a\u53d6\u6574\uff08\u5411\u6570\u8f74\u6b63\u65b9\u5411\uff09<\/span><\/span>\nmath.ceil(<\/span>0.3<\/span>) <\/span># 1<\/span><\/span>\nmath.ceil(<\/span>0.5<\/span>)  <\/span># 1<\/span><\/span>\nmath.ceil(-<\/span>0.5<\/span>)  <\/span># 0<\/span><\/span>\nmath.ceil(-<\/span>0.9<\/span>)  <\/span># 0<\/span><\/span>\n<\/span>\n<\/span>\n# \u8f93\u5165\u65f6\u8f6c\u6362\u793a\u4f8b1\uff1a\u5c06\u5b57\u7b26\u4e32\u201c1 2 3 4\u201d\u8f6c\u6362\u4e3a\u6574\u578b\u5217\u8868<\/span><\/span>\nfor<\/span> line <\/span>in<\/span> sys.stdin:<\/span><\/span>\n    a = <\/span>list<\/span>(<\/span>map<\/span>(<\/span>int<\/span>,line.strip().split(<\/span>" "<\/span>))) <\/span># [1, 2, 3, 4]<\/span><\/span>\n    <\/span><\/span>\n# \u8f93\u5165\u65f6\u8f6c\u6362\u793a\u4f8b2\uff1a\u5c06\u5b57\u7b26\u4e32\u201c1 2 3 4\u201d\u5185\u7684\u6570\u5b57\u5e73\u65b9\u540e\uff0c\u8f6c\u6362\u4e3a\u5341\u516d\u8fdb\u5236\uff0c\u5f97\u5230\u5217\u8868<\/span><\/span>\nfor<\/span> line <\/span>in<\/span> sys.stdin:<\/span><\/span>\n    a = <\/span>list<\/span>(<\/span>map<\/span>(<\/span>lambda<\/span> <\/span>x<\/span>:<\/span>hex<\/span>(<\/span>int<\/span>(x)**<\/span>2<\/span>),line.strip().split(<\/span>" "<\/span>))) <\/span><\/span>\n    <\/span>#['0x1', '0x4', '0x9', '0x10']<\/span><\/span>\n    <\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u6392\u5e8f<\/h2>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
#Python3\u4e2dlist.sort()\u548csorted()\u4e2d\u7684cmp\u53c2\u6570\u5df2\u7ecf\u88ab\u79fb\u9664\uff0c\u6b64\u5904\u5373\u4e3aPython3<\/span><\/span>\n<\/span>\n#list.sort()\u6ca1\u6709\u8fd4\u56de\u503c\uff0c\u81ea\u8eab\u6392\u5e8f<\/span><\/span>\nlist_in.sort(<\/span>key<\/span>=<\/span>None<\/span>, <\/span>reverse<\/span>=<\/span>False<\/span>) <\/span><\/span>\n<\/span>\n#sorted()\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\uff0c\u53c2\u6570\u63a5\u53d7\u4efb\u4f55\u53ef\u8fed\u4ee3\u5bf9\u8c61<\/span><\/span>\nsorted_list = <\/span>sorted<\/span>(list_in, <\/span>key<\/span>=<\/span>None<\/span>, <\/span>reverse<\/span>=<\/span>False<\/span>)  <\/span><\/span>\n<\/span>\n#\u6309key\u6392\u5e8f\u4f7f\u7528\u4f8b\u5b50\uff1a<\/span><\/span>\nlist1.sort(<\/span>key<\/span>=<\/span>lambda<\/span> <\/span>x<\/span>:x[<\/span>1<\/span>])<\/span><\/span>\nlist1_sorted = <\/span>sorted<\/span>(list1, <\/span>key<\/span>=<\/span>lambda<\/span> <\/span>x<\/span>:x[<\/span>1<\/span>])<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5bb9\u5668\u76f8\u5173<\/h2>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
#\u5217\u8868<\/span><\/span>\na = [<\/span>123<\/span>,<\/span>"abc"<\/span>] <\/span>#\u53ef\u4ee5\u6709\u4e0d\u540c\u7c7b\u578b\u7684\u5143\u7d20<\/span><\/span>\ndp = [[<\/span>0<\/span> <\/span>for<\/span> i <\/span>in<\/span> <\/span>range<\/span>(<\/span>3<\/span>)] <\/span>for<\/span> j <\/span>in<\/span> <\/span>range<\/span>(<\/span>3<\/span>)] <\/span>#\u521b\u5efa\u4e8c\u7ef4\u5217\u8868[[0, 0, 0], [0, 0, 0], [0, 0, 0]]<\/span><\/span>\nlist<\/span>.append(x)\t<\/span>#\u628a\u4e00\u4e2a\u5143\u7d20\u6dfb\u52a0\u5230\u5217\u8868\u7684\u7ed3\u5c3e<\/span><\/span>\nlist<\/span>.index(x)\t<\/span>#\u8fd4\u56de\u5217\u8868\u4e2d\u7b2c\u4e00\u4e2a\u503c\u4e3a x \u7684\u5143\u7d20\u7684\u7d22\u5f15\u3002\u5982\u679c\u6ca1\u6709\u5339\u914d\u7684\u5143\u7d20\u5c31\u4f1a\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\u3002<\/span><\/span>\nlist<\/span>.count(x)\t<\/span>#\u8fd4\u56de x \u5728\u5217\u8868\u4e2d\u51fa\u73b0\u7684\u6b21\u6570\u3002<\/span><\/span>\nlist<\/span>.sort()\t<\/span>#\u5bf9\u5217\u8868\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\u3002<\/span><\/span>\nlist<\/span>.reverse()\t<\/span>#\u5012\u6392\u5217\u8868\u4e2d\u7684\u5143\u7d20\u3002<\/span><\/span>\nlist<\/span>.pop() <\/span>#\u8fd4\u56de\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002\u5143\u7d20\u968f\u5373\u4ece\u5217\u8868\u4e2d\u88ab\u79fb\u9664\u3002\u53ef\u4ee5\u548cappend\u914d\u5408\u5b8c\u6210\u6808\u529f\u80fd<\/span><\/span>\nlist<\/span>.remove(x) <\/span>#\u7528\u4e8e\u79fb\u9664\u5217\u8868\u4e2d\u67d0\u4e2a\u503c\u7684\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u3002x\u662f\u503c\uff0c\u4e0d\u662f\u7d22\u5f15\u3002<\/span><\/span>\nlist<\/span>.insert(index, obj) <\/span>#\t\u5c06\u5bf9\u8c61\u63d2\u5165\u5217\u8868\u6307\u5b9a\u4f4d\u7f6e\uff0cindex = 0\u5c31\u662f\u63d2\u5165\u5728\u6700\u524d\u9762<\/span><\/span>\nfor<\/span> i, v <\/span>in<\/span> <\/span>enumerate<\/span>([<\/span>'tic'<\/span>, <\/span>'tac'<\/span>, <\/span>'toe'<\/span>]): <\/span>#\u6309\u7d22\u5f15\u904d\u5386\u5217\u8868<\/span><\/span>\n  <\/span>print<\/span>(i, v)<\/span><\/span>\n<\/span>\n#\u96c6\u5408<\/span><\/span>\n#\u521b\u5efa<\/span><\/span>\nset1 = {<\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>, <\/span>4<\/span>}<\/span># \u76f4\u63a5\u4f7f\u7528\u5927\u62ec\u53f7\u521b\u5efa\u96c6\u5408<\/span><\/span>\nset2 = <\/span>set<\/span>([<\/span>4<\/span>, <\/span>5<\/span>, <\/span>6<\/span>, <\/span>7<\/span>])  <\/span># \u4f7f\u7528 set() \u51fd\u6570\u4ece\u5217\u8868\u521b\u5efa\u96c6\u5408\uff0c\u5373\u4ece\u5217\u8868\u8f6c\u6362\u4e3a\u96c6\u5408<\/span><\/span>\nset3 = <\/span>set<\/span>() <\/span>#\u6ce8\u610f\uff1a\u521b\u5efa\u4e00\u4e2a\u7a7a\u96c6\u5408\u5fc5\u987b\u7528 set() \u800c\u4e0d\u662f { }\uff0c\u56e0\u4e3a { } \u662f\u7528\u6765\u521b\u5efa\u4e00\u4e2a\u7a7a\u5b57\u5178\u3002<\/span><\/span>\n#\u6dfb\u52a0\u5143\u7d20<\/span><\/span>\nset1.add(<\/span>5<\/span>)<\/span><\/span>\n#\u79fb\u9664\u5143\u7d20\uff0c\u5982\u679c\u5143\u7d20\u4e0d\u5b58\u5728\u4f1a\u53d1\u751f\u9519\u8bef<\/span><\/span>\ns.remove(x)<\/span><\/span>\n#\u79fb\u9664\u5143\u7d20\uff0c\u4e0d\u5b58\u5728\u4e0d\u4f1a\u62a5\u9519<\/span><\/span>\ns.discard(x) <\/span><\/span>\n#set\u904d\u5386\u53ef\u4f7f\u7528\u7b80\u5355\u7684for in<\/span><\/span>\nfor<\/span> i <\/span>in<\/span> s:<\/span><\/span>\n  <\/span>print<\/span> i<\/span><\/span>\n<\/span>\n#\u5b57\u5178<\/span><\/span>\nknights = {<\/span>'gallahad'<\/span>: <\/span>'the pure'<\/span>, <\/span>'robin'<\/span>: <\/span>'the brave'<\/span>}<\/span><\/span>\nfor<\/span> k, v <\/span>in<\/span> knights.items(): <\/span>#\u4f7f\u7528dict.items() \u6309\u952e\u503c\u904d\u5386\u5b57\u5178<\/span><\/span>\n  <\/span>print<\/span>(k, v)<\/span><\/span>\n  <\/span><\/span>\n#deque\u53cc\u7aef\u961f\u5217<\/span><\/span>\nfrom<\/span> collections <\/span>import<\/span> deque<\/span><\/span>\nqueue1 = deque([<\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>])<\/span><\/span>\nqueue1.append(<\/span>4<\/span>)  <\/span>#\u53f3\u7aef\u5165\u961f<\/span><\/span>\nqueue1.popleft() <\/span>#\u5de6\u7aef\u5f39\u51fa\u5e76\u8fd4\u56de\u503c\uff0c\u6ca1\u6709\u5143\u7d20\u4f1a\u62a5\u9519<\/span><\/span>\nqueue1.pop() <\/span>#\u53f3\u7aef\u5f39\u51fa\u5e76\u8fd4\u56de\u503c\uff0c\u6ca1\u6709\u5143\u7d20\u4f1a\u62a5\u9519<\/span><\/span>\n<\/span>\n#\u5b57\u7b26\u4e32<\/span><\/span>\n#\u6b63\u5411\u67e5\u627efind:\u8fd4\u56de\u8fd4\u56de\u5b57\u7b26\u4e32\u3010\u7b2c\u4e00\u6b21\u3011\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u6ca1\u6709\u5339\u914d\u9879\u5219\u8fd4\u56de-1<\/span><\/span>\nstr<\/span>.find(<\/span>str<\/span>, <\/span>beg<\/span>=<\/span>0<\/span>, <\/span>end<\/span>=<\/span>len<\/span>(string))<\/span><\/span>\n#\u53cd\u5411\u67e5\u627erfind\uff1a\u8fd4\u56de\u8fd4\u56de\u5b57\u7b26\u4e32\u3010\u6700\u540e\u4e00\u6b21\u3011\u51fa\u73b0\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u6ca1\u6709\u5339\u914d\u9879\u5219\u8fd4\u56de-1<\/span><\/span>\nstr<\/span>.rfind(<\/span>str<\/span>, <\/span>beg<\/span>=<\/span>0<\/span>, <\/span>end<\/span>=<\/span>len<\/span>(string))<\/span><\/span>\n<\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
\u5f02\u5e38\u5904\u7406<\/h2>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
try<\/span>:<\/span><\/span>\n  <\/span># \u53ef\u80fd\u51fa\u9519\u7684\u4ee3\u7801<\/span><\/span>\nexcept<\/span>(Exception1, Exception2, ... ) <\/span>as<\/span> e:<\/span><\/span>\n  <\/span># \u53d1\u751f\u5f02\u5e38\u65f6\u6267\u884c<\/span><\/span>\nelse<\/span>:<\/span><\/span>\n  <\/span># \u6b63\u786e\u65f6\u6267\u884c<\/span><\/span>\nfinally<\/span>:<\/span><\/span>\n  <\/span># \u65e0\u8bba\u5bf9\u9519\u90fd\u6267\u884c<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
<\/span>\n# \u4e07\u80fd\u5f02\u5e38\u5904\u7406 try + except Exception as e<\/span><\/span>\n<\/span>\n# \u4f8b\u5b50<\/span><\/span>\nfrom<\/span> collections <\/span>import<\/span> deque<\/span><\/span>\nqueue1 = deque()<\/span><\/span>\ntry<\/span>:<\/span><\/span>\n    queue1.pop()<\/span><\/span>\nexcept<\/span> <\/span>Exception<\/span> <\/span>as<\/span> e:<\/span><\/span>\n    <\/span>print<\/span>(e)           <\/span>#pop from an empty deque<\/span><\/span>\n    <\/span><\/span>\n# \u5f53\u4e0d\u9700\u8981\u83b7\u53d6\u5f02\u5e38\u4fe1\u606f\u65f6\uff0c\u53ef\u4ee5\u4e0d\u52a0as<\/span><\/span>\ntry<\/span>:<\/span><\/span>\n    value = <\/span>int<\/span>(<\/span>input<\/span>(<\/span>"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6574\u6570: "<\/span>))<\/span><\/span>\nexcept<\/span> <\/span>ValueError<\/span>:<\/span><\/span>\n    <\/span>print<\/span>(<\/span>"\u8f93\u5165\u65e0\u6548\uff0c\u8bf7\u8f93\u5165\u4e00\u4e2a\u6574\u6570"<\/span>)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u9762\u5411\u5bf9\u8c61\u57fa\u7840<\/h2>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
class<\/span> <\/span>Tree<\/span>:<\/span><\/span>\n   <\/span>#\u7c7b\u53d8\u91cf\uff0c\u5373\u9759\u6001\u53d8\u91cf\uff0c<\/span><\/span>\n   <\/span>#\u8d4b\u503c\u65f6\uff0c\u9700\u8981\u901a\u8fc7Tree\u6765\u6253\u70b9\u8d4b\u503c\u624d\u80fd\u6b63\u786e\u4f7f\u7528<\/span><\/span>\n   <\/span>#\u82e5\u4f7f\u7528\u5b9e\u4f8btree\u6253\u70b9\u6765\u8d4b\u503c\uff0c\u5219tree\u5bf9\u8c61\u81ea\u5df1\u751f\u6210\u4e86\u4e00\u4e2a\u53d8\u91cfcount\u5e76\u8d4b\u503c\uff0c\u5e76\u6ca1\u6709\u66f4\u6539\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u3002<\/span><\/span>\n   <\/span>#\u4f46\u8bbf\u95ee\u65f6\uff0c\u4f7f\u7528\u7c7b\u540d\u548c\u5b9e\u4f8b\u5747\u53ef<\/span><\/span>\n   treeCount = <\/span>0<\/span> <\/span><\/span>\n <\/span><\/span>\n   <\/span>def<\/span> <\/span>__init__<\/span>(<\/span>self<\/span>, <\/span>val<\/span>, <\/span>left<\/span>, <\/span>right<\/span>): <\/span>#\u6784\u9020\u51fd\u6570<\/span><\/span>\n      <\/span>self<\/span>.val = val<\/span><\/span>\n      <\/span>self<\/span>.left = left<\/span><\/span>\n      <\/span>self<\/span>.right = right<\/span><\/span>\n      Tree.treeCount += <\/span>1<\/span><\/span>\n   <\/span><\/span>\n   <\/span>#\u5b9a\u4e49\u6210\u5458\u51fd\u6570\u65f6\u522b\u5fd8\u4e86\u52a0\u4e00\u4e2aself\u53c2\u6570\u3002\u5982\u679c\u4e0d\u52a0\uff0c\u4e00\u822c\u7528\u88c5\u9970\u5668@staticmethod\u4fee\u9970\uff0c\u53d8\u4e3a\u9759\u6001\u51fd\u6570<\/span><\/span>\n   <\/span>def<\/span> <\/span>displayCount<\/span>(<\/span>self<\/span>): <\/span><\/span>\n     <\/span>print<\/span> (<\/span>"Total Tree <\/span>%d<\/span>"<\/span> % Tree.treeCount)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u53c2\u6570\u4f20\u9012\u4e0e\u6df1\u62f7\u8d1d<\/h2>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
#\u53c2\u6570\u4f20\u9012\uff1a\u53ef\u53d8\u7c7b\u578b\u4e0e\u4e0d\u53ef\u53d8\u7c7b\u578b<\/span><\/span>\n#1\u3001\u4e0d\u53ef\u53d8\u7c7b\u578b\uff1a\u503c\u4f20\u9012\uff0c\u5982\u6574\u6570\u3001\u5b57\u7b26\u4e32\u3001\u5143\u7ec4\u3002<\/span><\/span>\n#2\u3001\u53ef\u53d8\u7c7b\u578b\uff1a\u5f15\u7528\u4f20\u9012\uff0c\u5982 \u5217\u8868\uff0c\u5b57\u5178\u3002<\/span><\/span>\n<\/span>\n<\/span>\n#\u6d45\u62f7\u8d1d\uff0c\u53ea\u62f7\u8d1d\u7236\u5bf9\u8c61\uff0c\u4e0d\u4f1a\u62f7\u8d1d\u5bf9\u8c61\u7684\u5185\u90e8\u7684\u5b50\u5bf9\u8c61\u3002<\/span><\/span>\nb = a.copy()<\/span><\/span>\n#\u6df1\u62f7\u8d1d\uff0c\u5b8c\u5168\u62f7\u8d1d\u4e86\u7236\u5bf9\u8c61\u53ca\u5176\u5b50\u5bf9\u8c61\u3002<\/span><\/span>\nimport<\/span> copy<\/span><\/span>\nc = copy.deepcopy(a)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
 \u4ee5\u4e0b\u4e3a\u516b\u80a1\uff08\u5ba2\u89c2\u9898\u7528\uff09<\/h2>\n\n\n\n
Python\u8bed\u8a00\u7c7b\u578b<\/h2>\n\n\n\n
Python \u662f\u5f3a\u7c7b\u578b<\/strong>\u7684\u52a8\u6001\u811a\u672c\u8bed\u8a00\u3002<\/p>\n\n\n\n
\n
\u5f3a\u7c7b\u578b\uff1a\u4e0d\u5141\u8bb8\u4e0d\u540c\u7c7b\u578b\u76f8\u52a0\u3002
\u52a8\u6001\uff1a\u4e0d\u4f7f\u7528\u663e\u793a\u6570\u636e\u7c7b\u578b\u58f0\u660e\uff0c\u4e14\u786e\u5b9a\u4e00\u4e2a\u53d8\u91cf\u7684\u7c7b\u578b\u662f\u5728\u7b2c\u4e00\u6b21\u7ed9\u5b83\u8d4b\u503c\u7684\u65f6\u5019\u3002
\u811a\u672c\u8bed\u8a00\uff1a\u4e00\u822c\u4e5f\u662f\u89e3\u91ca\u578b\u8bed\u8a00\uff0c\u8fd0\u884c\u4ee3\u7801\u53ea\u9700\u8981\u4e00\u4e2a\u89e3\u91ca\u5668\uff0c\u4e0d\u9700\u8981\u7f16\u8bd1\u3002<\/p>\n<\/blockquote>\n\n\n\n
\u4f5c\u8005\uff1a\u7f16\u7a0b\u6587\u9752\u674e\u72d7\u86cb
\u94fe\u63a5\uff1ahttps:\/\/www.nowcoder.com\/discuss\/378581336049594368<\/a>
\u6765\u6e90\uff1a\u725b\u5ba2\u7f51<\/p>\n\n\n\n
\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/h2>\n\n\n\n
Python\u4e2d\u5206\u4e3a\u516d\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
\u53ef\u53d8\u7c7b\u578b\uff08\u53c8\u53eb\u52a8\u6001\u6570\u636e\u7c7b\u578b\uff0c\u652f\u6301\u589e\u5220\u6539\u64cd\u4f5c\uff09\uff1a\u5217\u8868(list)\u3001\u5b57\u5178(dictionary)\u3001\u96c6\u5408(set)<\/p>\n\n\n\n
\u4e0d\u53ef\u53d8\u7c7b\u578b\uff08\u53c8\u53eb\u9759\u6001\u6570\u636e\u7c7b\u578b\uff0c\u6ca1\u6709\u589e\u5220\u6539\u64cd\u4f5c\uff09\uff1a\u6570\u5b57(number)\u3001\u5b57\u7b26\u4e32(string)\u3001\u5143\u7ec4(tuple)<\/p>\n\n\n\n
\u6570\u5b57\u7c7b\u578b(Numbers)\uff1a<\/h3>\n\n\n\n
\u6570\u5b57\u7c7b\u578b\u4e0b\u8fd8\u53ef\u5206\u4e3a\u6574\u6570(int)\u3001\u6d6e\u70b9\u6570(float)\u3001\u590d\u6570(complex)\u3001\u5e03\u5c14(bool)<\/p>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
age = <\/span>22<\/span>        <\/span># \u6574\u6570\u578b\uff0c\u53ef\u4ee5\u901a\u8fc7print(sys.maxsize)\u67e5\u770b\u6700\u5927\u53d6\u503c\u8303\u56f4<\/span><\/span>\nprint<\/span>(age)      <\/span># \u8f93\u51fa\uff1a22<\/span><\/span>\n<\/span>\nweight = <\/span>116.65<\/span> <\/span># \u6d6e\u70b9\u578b<\/span><\/span>\nprint<\/span>(weight)   <\/span># \u8f93\u51fa\uff1a116.65<\/span><\/span>\n<\/span>\nc1 = <\/span>1<\/span> + <\/span>2<\/span>j<\/span><\/span>\nc2 = <\/span>2<\/span> + <\/span>3<\/span>j<\/span><\/span>\nprint<\/span>(c1+c2)    <\/span># \u8f93\u51fa\uff1a(3+5j)\uff0c\u590d\u6570\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\u51e0\u4e4e\u7528\u4e0d\u5230\uff0c\u8bf7\u81ea\u884c\u4e86\u89e3<\/span><\/span>\nprint<\/span>(<\/span>complex<\/span>(<\/span>2<\/span>,<\/span>1<\/span>)) <\/span># \u8f93\u51fa\uff1a(2+1j)<\/span><\/span>\n<\/span>\n<\/span>\nprint<\/span>(<\/span>True<\/span> == <\/span>1<\/span>)  <\/span># \u8f93\u51fa\uff1aTrue<\/span><\/span>\nprint<\/span>(<\/span>False<\/span> == <\/span>0<\/span>) <\/span># \u8f93\u51fa\uff1aTrue<\/span><\/span>\n# True==1\uff0cFalse==0 \uff0c\u56e0\u6b64True \u548c False \u53ef\u4ee5\u548c\u6570\u5b57\u76f8\u52a0<\/span><\/span>\nprint<\/span>(<\/span>True<\/span> + <\/span>1<\/span>)   <\/span># \u8f93\u51fa\uff1a2<\/span><\/span>\nprint<\/span>(<\/span>False<\/span> - <\/span>2<\/span>)  <\/span># \u8f93\u51fa\uff1a-2<\/span><\/span>\n<\/span>\n# \u2193\u5176\u5b9e\u5e03\u5c14\u578b\u5c31\u662f\u6574\u6570\u578b\u7684\u5b50\u7c7b\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u7f6e\u51fd\u6570issubclass()\u5224\u65ad\uff0c\u8be5\u51fd\u6570\u662f\u7528\u4e8e\u5224\u65ad\u4e00\u4e2a\u7c7b\u578b\u5bf9\u8c61\u662f\u5426\u662f\u53e6\u4e00\u4e2a\u7c7b\u578b\u5bf9\u8c61\u7684\u5b50\u7c7b<\/span><\/span>\nprint<\/span>(<\/span>issubclass<\/span>(<\/span>bool<\/span>, <\/span>int<\/span>)) <\/span># \u8f93\u51fa\uff1aTrue<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u5b57\u7b26\u4e32(String)<\/h3>\n\n\n\n
\u5b57\u7b26\u4e32\u5fc5\u987b\u4f7f\u7528''<\/code>\u6216\"\"<\/code>\u62ec\u8d77\u6765\uff0c\u5bf9\u4e8e\u7279\u6b8a\u5b57\u7b26\u53ef\u4ee5\u4f7f\u7528\u53cd\u659c\u6760\\<\/code>\u8fdb\u884c\u8f6c\u4e49<\/a>\uff0c\u7528+<\/code>\u62fc\u63a5\u591a\u4e2a\u5b57\u7b26\u4e32\uff0c \u7528*<\/code>\u590d\u5236\u5b57\u7b26\u4e32\uff0c\u5b57\u7b26\u4e32\u8fd8\u652f\u6301\u7d22\u5f15\u622a\u53d6(\u53c8\u53eb\u5207\u7247)<\/p>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
name = <\/span>"ZhangSan"<\/span>   <\/span># \u5b57\u7b26\u4e32\u578b\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528\u5355\u62ec\u53f7<\/span><\/span>\nprint<\/span>(name)         <\/span># \u8f93\u51fa\uff1aZhangSan<\/span><\/span>\nprint<\/span>(name * <\/span>2<\/span>)    <\/span># \u8f93\u51fa\u5b57\u7b26\u4e32\u4e24\u6b21\uff0c\u4e5f\u53ef\u4ee5\u5199\u6210 print (2 * name)\uff0c\u8f93\u51fa\uff1aZhangSanZhangSan<\/span><\/span>\nprint<\/span>(name +<\/span>'-123'<\/span>)<\/span># \u62fc\u63a5\u5b57\u7b26\u4e32\uff0c\u8f93\u51fa\uff1aZhangSan-123<\/span><\/span>\nprint<\/span>(name +<\/span>'<\/span>\\'<\/span>123<\/span>\\'<\/span>'<\/span>)<\/span># \u62fc\u63a5\u5b57\u7b26\u4e32\u5e76\u5c06\u5355\u5f15\u53f7\u8f6c\u4e49\uff0c\u8f93\u51fa\uff1aZhangSan'123'<\/span><\/span>\n<\/span>\nprint<\/span>(name[<\/span>0<\/span>:-<\/span>1<\/span>])  <\/span># \u8f93\u51fa\u7b2c\u4e00\u4e2a\u81f3\u5012\u6570\u7b2c\u4e8c\u4e2a\u7684\u5b57\u7b26\uff0c\u622a\u53d6\u65f6\u987e\u5934\u4e0d\u987e\u5c3e\uff0c\u8f93\u51fa\uff1aZhangSa<\/span><\/span>\nprint<\/span>(name[<\/span>0<\/span>])     <\/span># \u8f93\u51fa\u7b2c\u4e00\u4e2a\u5b57\u7b26\uff0c\u8f93\u51fa\uff1aZ<\/span><\/span>\nprint<\/span>(name[-<\/span>1<\/span>])    <\/span># \u8f93\u51fa\u6700\u540e\u4e00\u4e2a\u5b57\u7b26\uff0c\u8f93\u51fa\uff1an<\/span><\/span>\nprint<\/span>(name[<\/span>2<\/span>:])    <\/span># \u8f93\u51fa\u4ece\u7b2c\u4e09\u4e2a\u5f00\u59cb\u4e4b\u540e\u7684\u6240\u6709\u5b57\u7b26\uff0c\u8f93\u51fa\uff1aangSan<\/span><\/span>\nprint<\/span>(name[<\/span>0<\/span>:-<\/span>1<\/span>:<\/span>2<\/span>]) <\/span># \u8f93\u51fa\u7b2c\u4e00\u4e2a\u81f3\u5012\u6570\u7b2c\u4e8c\u4e2a\u7684\u5b57\u7b26\uff0c\u6b65\u957f\u4e3a2\uff0c\u8f93\u51fa\uff1aZaga<\/span><\/span>\nprint<\/span>(name[<\/span>8<\/span>])\t\t<\/span># \u82e5\u5b57\u7b26\u4e0d\u5b58\u5728\uff0c\u5219\u4f1a\u629b\u51faIndexError: string index out of range<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
\u5217\u8868(List)<\/strong><\/h3>\n\n\n\n
\u5217\u8868\u662f\u4e00\u7ec4\u53ef\u91cd\u590d\u4e14\u6709\u5e8f\u7684\u6570\u636e\u96c6\u5408\uff0c\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u636e\u90fd\u53ef\u4ee5\u5b58\u5230\u5217\u8868\u4e2d\uff0c\u4f1a\u6839\u636e\u9700\u8981\u52a8\u6001\u5206\u914d\u548c\u56de\u6536\u5185\u5b58\uff0c\u662fPython\u4e2d\u4f7f\u7528\u6700\u9891\u7e41\u7684\u6570\u636e\u7c7b\u578b\uff0c\u5217\u8868\u540c\u6837\u4e5f\u652f\u6301\u7d22\u5f15\u622a\u53d6(\u53c8\u53eb\u5207\u7247)\uff0c\u5217\u8868\u4e2d\u7684\u5143\u7d20\u662f\u53ef\u53d8\u7684\uff0c\u80fd\u591f\u8fdb\u884c\u589e\u5220\u6539\u64cd\u4f5c<\/p>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
# \u5217\u8868\u521b\u5efa<\/span><\/span>\nl0 = []\t<\/span># \u521b\u5efa\u7a7a\u5217\u8868<\/span><\/span>\nl1 = [<\/span>"\u5f20\u4e09"<\/span>,<\/span>'lisi'<\/span>,<\/span>12<\/span>,[<\/span>"22"<\/span>,<\/span>"lisi"<\/span>,<\/span>"\u738b\u6b66"<\/span>],<\/span>"\u8d75\u67f3"<\/span>]  <\/span># \u76f4\u63a5\u4f7f\u7528\u4e2d\u62ec\u53f7\u521b\u5efa\u5217\u8868<\/span><\/span>\nl2 = <\/span>list<\/span>([<\/span>'lisi'<\/span>,<\/span>12<\/span>,(<\/span>"22"<\/span>,<\/span>"\u738b\u6b66"<\/span>),<\/span>"\u8d75\u67f3"<\/span>])  \t\t<\/span># \u6216\u8005\u8c03\u7528\u5185\u7f6e\u51fd\u6570list()\uff0c\u901a\u5e38\u7528\u4e8e\u8f6c\u6362\u4e3a\u5217\u8868\u65f6\u4f7f\u7528<\/span><\/span>\n<\/span>\n# \u5217\u8868\u4e2d\u6dfb\u52a0\u5143\u7d20<\/span><\/span>\nl3 = [<\/span>1<\/span>,<\/span>2<\/span>]<\/span><\/span>\nl4 = [<\/span>"\u58f9"<\/span>,<\/span>"er"<\/span>]<\/span><\/span>\nl3.append(<\/span>3<\/span>)\t\t<\/span># \u5728l3\u5217\u8868\u672b\u5c3e\u6dfb\u52a0\u5143\u7d203\uff0c\u8f93\u51fa\uff1a[1, 2, 3]<\/span><\/span>\nl3.append(l4)\t\t<\/span># \u5c06l4\u5217\u8868\u6dfb\u52a0\u5230l3\u5217\u8868\u672b\u5c3e\uff0c\u8f93\u51fa\uff1a[1, 2, ['\u58f9', 'er']]<\/span><\/span>\nl3.extend(<\/span>"3L"<\/span>)\t\t<\/span># \u5728l3\u5217\u8868\u672b\u5c3e\u81f3\u5c11\u6dfb\u52a0\u4e24\u4e2a\u5143\u7d20\uff0c\u8f93\u51fa\uff1a[1, 2, '3', 'L']<\/span><\/span>\nl3.extend(l4)\t\t<\/span># \u5c06l4\u5217\u8868\u6dfb\u52a0\u5230l3\u5217\u8868\u672b\u5c3e\uff0c\u7b49\u540c\u4e8el3+l4\uff0c\u8f93\u51fa\uff1a[1, 2, '\u58f9', 'er']<\/span><\/span>\nl3.insert(<\/span>1<\/span>,<\/span>"\u5f20\u73ca"<\/span>)  <\/span># \u5728l3\u5217\u8868\u4e2d\u7d22\u5f15\u4e3a1\u7684\u4f4d\u7f6e\u63d2\u5165\u5143\u7d20\uff0c\u8f93\u51fa\uff1a[1, '\u5f20\u73ca', 2]<\/span><\/span>\nl3.insert(<\/span>0<\/span>,l4)\t\t<\/span># \u5c06l4\u5217\u8868\u6dfb\u52a0\u5230l3\u5217\u8868\u5934\u90e8\uff0c\u8f93\u51fa\uff1a[['\u58f9', 'er'], 1, 2]<\/span><\/span>\n<\/span>\n\u6ce8\u610f\u4e09\u8005\u7684\u533a\u522b\uff1a<\/span><\/span>\nappend()\uff1a\u6307\u5728\u5217\u8868\u7684\u672b\u5c3e\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\uff0c\u65b0\u5143\u7d20\u4f1a\u89c6\u4e3a\u4e00\u4e2a\u6574\u4f53\u8ffd\u52a0\u5230\u5217\u8868\u672b\u5c3e<\/span><\/span>\nextend()\uff1a\u6307\u5728\u5217\u8868\u7684\u672b\u5c3e\u81f3\u5c11\u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20\uff0c\u65b0\u5143\u7d20\u4f1a\u5c06\u6574\u4f53\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u4e00\u4e2a\u4e00\u4e2a\u5730\u8ffd\u52a0\u5217\u8868\u672b\u5c3e\uff08\uff09 \u7c7b\u4f3c+\u53f7<\/span><\/span>\ninsert()\uff1a\u6307\u5728\u5217\u8868\u7684\u6307\u5b9a\u7d22\u5f15\u4f4d\u7f6e\u6dfb\u52a0\u5143\u7d20<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
\u5143\u7ec4(Tuple)<\/h3>\n\n\n\n
\u5143\u7ec4\u4e5f\u662f\u4e00\u7ec4\u53ef\u91cd\u590d\u4e14\u6709\u5e8f\u7684\u5bf9\u8c61\u96c6\u5408\uff0c\u4efb\u4f55\u7c7b\u578b\u7684\u6570\u636e\u90fd\u53ef\u4ee5\u5b58\u5230\u5143\u7ec4\u4e2d\uff0c\u4f46\u662f\u5143\u7ec4\u4e2d\u7684\u5143\u7d20\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u5143\u7ec4\u540c\u6837\u4e5f\u652f\u6301\u7d22\u5f15\u622a\u53d6(\u53c8\u53eb\u5207\u7247)<\/p>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
# \u521b\u5efa\u5143\u7ec4<\/span><\/span>\nt0 = ()\t\t<\/span># \u521b\u5efa\u7a7a\u5143\u7ec4<\/span><\/span>\nt1 = (<\/span>"\u5f20\u73ca"<\/span>,<\/span>"lisi"<\/span>,[<\/span>"\u674e\u601d"<\/span>,<\/span>12<\/span>,<\/span>"Python"<\/span>],(<\/span>"\u738b\u6b66"<\/span>,<\/span>"22"<\/span>))\t<\/span># \u76f4\u63a5\u4f7f\u7528\u5c0f\u62ec\u53f7\u521b\u5efa\u5143\u7ec4<\/span><\/span>\nt2 = (<\/span>1<\/span>,)\t\t\t\t\t\t<\/span># \u5f53\u5143\u7ec4\u53ea\u6709\u4e00\u4e2a\u5143\u7d20\u65f6\u9700\u8981\u5728\u540e\u9762\u52a0\u4e0a\u9017\u53f7<\/span><\/span>\nt3 = <\/span>tuple<\/span>((<\/span>"\u4f9d\u513f"<\/span>,<\/span>22<\/span>,<\/span>"Java"<\/span>))   <\/span># \u6216\u8005\u8c03\u7528\u5185\u7f6e\u51fd\u6570tuple()\uff0c\u901a\u5e38\u7528\u4e8e\u8f6c\u6362\u4e3a\u5143\u7ec4\u65f6\u4f7f\u7528<\/span><\/span>\n<\/span>\n# \u4fee\u6539\u5143\u7ec4\u4e2d\u7684\u53ef\u53d8\u5bf9\u8c61<\/span><\/span>\nt1[<\/span>2<\/span>][<\/span>1<\/span>] = <\/span>"\u5341"<\/span>\t\t   <\/span># \u5c0612\u6539\u4e3a10<\/span><\/span>\nt1[<\/span>2<\/span>].remove(<\/span>"Python"<\/span>)  <\/span># \u5220\u9664Python\u5143\u7d20<\/span><\/span>\nt1[<\/span>2<\/span>].pop()\t\t\t\t<\/span># \u5220\u9664\u6700\u540e\u4e00\u4e2a\u5143\u7d20<\/span><\/span>\nt1[<\/span>2<\/span>].clear()\t\t\t<\/span># \u6e05\u7a7a\u5217\u8868<\/span><\/span>\nt1[<\/span>2<\/span>].append(<\/span>"\u554a\u54c8"<\/span>)\t   <\/span># \u6dfb\u52a0\u4e00\u4e2a\u5143\u7d20<\/span><\/span>\n# \u62fc\u63a5\u5143\u7ec4<\/span><\/span>\nprint<\/span>(t2+t3)\t\t\t<\/span># \u8f93\u51fa\uff1a('1', '\u4f9d\u513f', 22, 'Java')<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
\u5b57\u5178(Dictionary)<\/strong><\/h3>\n\n\n\n
\u5b57\u5178\u662f\u4e00\u7ec4\u53ef\u53d8\u7684\u65e0\u5e8f\u7684\u5bf9\u8c61\u96c6\u5408\uff0c\u5b57\u5178\u4e2d\u7684\u5143\u7d20\u662f\u901a\u8fc7\u952e(Key) : \u503c(Value)\u6765\u4fdd\u5b58\u7684\uff0c\u4e00\u7ec4\u952e\u503c\u5bf9\u79f0\u4e3a\u4e00\u4e2a\u5143\u7d20\uff0c\u5176\u4e2d\u952e(Key)\u4e0d\u53ef\u91cd\u590d\uff0c\u5fc5\u987b\u552f\u4e00\uff0c\u800c\u503c(Value)\u662f\u53ef\u91cd\u590d\u7684\uff0c\u5b57\u5178\u4f1a\u6d6a\u8d39\u8f83\u5927\u5185\u5b58\uff0c\u662f\u4e00\u79cd\u4f7f\u7528\u7a7a\u95f4\u6362\u65f6\u95f4\u7684\u6570\u636e\u7c7b\u578b<\/p>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
# \u521b\u5efa\u5b57\u5178<\/span><\/span>\nd0 = {}\t\t<\/span># \u521b\u5efa\u7a7a\u5b57\u5178<\/span><\/span>\nd1 = {<\/span>"\u5f20\u73ca"<\/span>:<\/span>100<\/span>,<\/span>"\u674e\u601d"<\/span>:<\/span>120<\/span>,<\/span>"\u738b\u6b66"<\/span>:<\/span>110<\/span>}\t<\/span># \u4f7f\u7528\u82b1\u62ec\u53f7\u521b\u5efa\u5b57\u5178<\/span><\/span>\nd2 = <\/span>dict<\/span>(<\/span>name<\/span>=<\/span>"\u674e\u5c14"<\/span>,<\/span>weight<\/span>=<\/span>116<\/span>)\t\t   <\/span># \u8c03\u7528\u5185\u7f6e\u51fd\u6570dict()\u521b\u5efa\uff0c\u901a\u5e38\u7528\u4e8e\u8f6c\u6362\u4e3a\u5b57\u5178\u65f6\u4f7f\u7528<\/span><\/span>\n<\/span>\n# \u83b7\u53d6\u5b57\u5178\u4e2d\u7684\u5143\u7d20<\/span><\/span>\nprint<\/span>(d1[<\/span>"\u674e\u601d"<\/span>])\t\t\t<\/span># \u4f7f\u7528\u4e2d\u62ec\u53f7\u6839\u636eKey\u83b7\u53d6Value\u503c\uff0c\u8f93\u51fa\uff1a120<\/span><\/span>\nprint<\/span>(d1[<\/span>"\u5f20\u4e09"<\/span>])\t\t\t<\/span># \u82e5Key\u4e0d\u5b58\u5728\uff0c\u5219\u629b\u51faKeyError: '\u5f20\u4e09'<\/span><\/span>\n<\/span>\n# \u2193\u8fd8\u53ef\u4ee5\u4f7f\u7528get()\u65b9\u6cd5\u53d6\u503c\uff0c\u6b64\u65b9\u5f0f\u82e5Key\u4e0d\u5b58\u5728\u5219\u8fd4\u56deNone\uff0c\u4e0d\u4f1a\u629b\u51faKeyError\u5f02\u5e38\uff0c\u8fd8\u53ef\u4ee5\u8bbe\u7f6e\u9ed8\u8ba4Value<\/span><\/span>\nprint<\/span>(d1.get(<\/span>"\u5f20\u73ca"<\/span>))\t\t<\/span># \u4f7f\u7528get()\u65b9\u6cd5\u53d6\u503c\uff0c\u8f93\u51fa\uff1a100<\/span><\/span>\nprint<\/span>(d1.get(<\/span>"\u738b\u6b66"<\/span>,<\/span>98<\/span>))\t<\/span># \u82e5\u5bf9\u5e94Key\u4e0d\u5b58\u5728\u5219\u8f93\u51fa\u9ed8\u8ba4\u503c\uff0c\u5426\u5219\u8f93\u51fa\u5bf9\u5e94\u7684Value\u503c\uff0c\u6b64\u5904\u8f93\u51fa\uff1a110<\/span><\/span>\n<\/span>\n# \u2193\u4f7f\u7528keys()\u65b9\u6cd5\u83b7\u53d6\u6240\u6709Key<\/span><\/span>\nprint<\/span>(d1.keys())\t\t <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Key\uff0c\u8f93\u51fa\uff1adict_keys(['\u5f20\u73ca', '\u674e\u601d', '\u738b\u6b66'])<\/span><\/span>\nprint<\/span>(<\/span>list<\/span>(d1.keys()))\t <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Key\u5e76\u8f6c\u4e3a\u5217\u8868\uff0c\u8f93\u51fa\uff1a['\u5f20\u73ca', '\u674e\u601d', '\u738b\u6b66']<\/span><\/span>\nprint<\/span>(<\/span>tuple<\/span>(d1.keys()))\t <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Key\u5e76\u8f6c\u4e3a\u5143\u7ec4\uff0c\u8f93\u51fa\uff1a('\u5f20\u73ca', '\u674e\u601d', '\u738b\u6b66')<\/span><\/span>\n<\/span>\n# \u2193\u4f7f\u7528values()\u65b9\u6cd5\u83b7\u53d6\u6240\u6709Value\u503c<\/span><\/span>\nprint<\/span>(d1.values())\t\t <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Value\u503c\uff0c\u8f93\u51fa\uff1adict_values([100, 120, 110])<\/span><\/span>\nprint<\/span>(<\/span>list<\/span>(d1.values())) <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Value\u503c\u5e76\u8f6c\u4e3a\u5217\u8868\uff0c\u8f93\u51fa\uff1a[100, 120, 110]<\/span><\/span>\nprint<\/span>(<\/span>tuple<\/span>(d1.values()))<\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Value\u503c\u5e76\u8f6c\u4e3a\u5143\u7ec4\uff0c\u8f93\u51fa\uff1a(100, 120, 110)<\/span><\/span>\n<\/span>\n# \u2193\u4f7f\u7528items()\u65b9\u6cd5\u83b7\u53d6\u6240\u6709\u7684\u952e\u503c\u5bf9<\/span><\/span>\nprint<\/span>(d1.items())\t\t <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Key:Value\uff0c\u8f93\u51fa\uff1adict_items([('\u5f20\u73ca', 100), ('\u674e\u601d', 120), ('\u738b\u6b66', 110)])<\/span><\/span>\nprint<\/span>(<\/span>list<\/span>(d1.items()))\t <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Key:Value\u5e76\u8f6c\u4e3a\u5217\u8868\uff0c\u8f93\u51fa\uff1a[('\u5f20\u73ca', 100), ('\u674e\u601d', 120), ('\u738b\u6b66', 110)]<\/span><\/span>\nprint<\/span>(<\/span>tuple<\/span>(d1.items())) <\/span># \u83b7\u53d6\u5b57\u5178\u4e2d\u6240\u6709\u7684Key:Value\u5e76\u8f6c\u4e3a\u5143\u7ec4\uff0c\u8f93\u51fa\uff1a(('\u5f20\u73ca', 100), ('\u674e\u601d', 120), ('\u738b\u6b66', 110))<\/span><\/span>\n<\/span>\nfor<\/span> item <\/span>in<\/span> d1:\t\t\t <\/span># \u76f4\u63a5\u4f7f\u7528for\u5faa\u73af\u904d\u5386\uff0c\u904d\u5386\u5f97\u5230\u7684\u662fKey<\/span><\/span>\n    <\/span>print<\/span>(item)\t\t\t <\/span># \u8fd4\u56de\u5b57\u5178\u4e2d\u6240\u6709\u7684Key<\/span><\/span>\n<\/span>\nfor<\/span> k, v <\/span>in<\/span> knights.items(): <\/span># \u800c\u904d\u5386dict.items() \uff0c\u662f\u6309Key:Value\u904d\u5386\u5b57\u5178<\/span><\/span>\n    <\/span>print<\/span>(k, v)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u96c6\u5408(set)<\/strong><\/h3>\n\n\n\n
\u96c6\u5408\u662f\u4e00\u7ec4\u53ef\u53d8\u7684\u3001\u65e0\u5e8f\u7684\u4e14\u4e0d\u53ef\u91cd\u590d\u7684\u5143\u7d20\u5e8f\u5217<\/p>\n\n\n\n
Python<\/span><\/path><\/path><\/svg><\/span>
# \u521b\u5efa\u96c6\u5408<\/span><\/span>\ns0 = <\/span>set<\/span>()\t\t\t\t\t\t <\/span># \u521b\u5efa\u7a7a\u96c6\u5408\uff0c\u4e0d\u80fd\u76f4\u63a5\u4f7f\u7528\u82b1\u62ec\u53f7\uff0c\u82b1\u62ec\u53f7\u9ed8\u8ba4\u662f\u521b\u5efa\u5b57\u5178<\/span><\/span>\ns1 = {<\/span>"\u674e\u601d"<\/span>,<\/span>"\u5f20\u73ca"<\/span>,<\/span>"\u674e\u601d"<\/span>,<\/span>"\u738b\u6b66"<\/span>}\t<\/span># \u82b1\u62ec\u53f7\u4e2d\u5143\u7d20\u975e\u952e\u503c\u5bf9\u65f6\uff0c\u521b\u5efa\u7684\u662f\u96c6\u5408<\/span><\/span>\ns2 = <\/span>set<\/span>(<\/span>"\u674e\u5c14"<\/span>)\t\t\t\t\t<\/span># \u8c03\u7528\u5185\u90e8\u51fd\u6570set()\u521b\u5efa\uff0c\u901a\u5e38\u7528\u4e8e\u8f6c\u6362\u4e3a\u96c6\u5408\u65f6\u4f7f\u7528<\/span><\/span>\n#\u6dfb\u52a0\u5143\u7d20<\/span><\/span>\nset1.add(<\/span>5<\/span>)<\/span><\/span>\n#\u79fb\u9664\u5143\u7d20\uff0c\u5982\u679c\u5143\u7d20\u4e0d\u5b58\u5728\u4f1a\u53d1\u751f\u9519\u8bef<\/span><\/span>\ns.remove(x)<\/span><\/span>\n#\u79fb\u9664\u5143\u7d20\uff0c\u4e0d\u5b58\u5728\u4e0d\u4f1a\u62a5\u9519<\/span><\/span>\ns.discard(x) <\/span><\/span>\n#set\u904d\u5386\u53ef\u4f7f\u7528\u7b80\u5355\u7684for in<\/span><\/span>\nfor<\/span> i <\/span>in<\/span> s:<\/span><\/span>\n  <\/span>print<\/span> i<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
\u4f4d\u8fd0\u7b97\u7b26<\/h2>\n\n\n\n
    \n
  • & \u6309\u4f4d\u4e0e<\/li>\n\n\n\n
  • | \u6309\u4f4d\u6216<\/li>\n\n\n\n
  • ^ \u5f02\u6216<\/li>\n\n\n\n
  • ~ \u6309\u4f4d\u53d6\u53cd<\/li>\n\n\n\n
  • << \u5de6\u79fb<\/li>\n\n\n\n
  • >> \u53f3\u79fb<\/li>\n<\/ul>\n\n\n\n
    \"\"<\/div><\/figure>\n\n\n\n
    \u53d8\u91cf\u4f5c\u7528\u57df<\/h2>\n\n\n\n
    \u53d8\u91cf\u7684\u4f5c\u7528\u57df\u53ef\u4ee5\u5206\u4e3a\u56db\u79cd\uff1a\u5c40\u90e8\u4f5c\u7528\u57df\u3001\u5d4c\u5957\u4f5c\u7528\u57df\u3001\u5168\u5c40\u4f5c\u7528\u57df\u548c\u5185\u7f6e\u4f5c\u7528\u57df<\/strong>\uff0c\u8fd9\u56db\u79cd\u4f5c\u7528\u57df\u9075\u5faa LEGB \u539f\u5219\u3002<\/p>\n\n\n\n
    Python<\/span><\/path><\/path><\/svg><\/span>
    # 1. \u5c40\u90e8\u4f5c\u7528\u57df\uff08Local\uff09<\/span><\/span>\n# \u5c40\u90e8\u4f5c\u7528\u57df\u4e2d\u7684\u53d8\u91cf\u662f\u5728\u51fd\u6570\u5185\u90e8\u5b9a\u4e49\u7684\uff0c\u53ea\u80fd\u5728\u8be5\u51fd\u6570\u5185\u90e8\u8bbf\u95ee\u3002<\/span><\/span>\ndef<\/span> <\/span>my_function<\/span>():<\/span><\/span>\n    x = <\/span>10<\/span>  <\/span># \u5c40\u90e8\u53d8\u91cf<\/span><\/span>\n    <\/span>print<\/span>(x)  <\/span># \u8f93\u51fa: 10<\/span><\/span>\nmy_function()<\/span><\/span>\nprint<\/span>(x)  <\/span># \u62a5\u9519\uff0cx \u5728\u51fd\u6570\u5916\u90e8\u4e0d\u53ef\u8bbf\u95ee<\/span><\/span>\n<\/span>\n# 2. \u5d4c\u5957\u4f5c\u7528\u57df\uff08Enclosing\uff09<\/span><\/span>\n# \u5d4c\u5957\u4f5c\u7528\u57df\u662f\u6307\u51fd\u6570\u5185\u90e8\u7684\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u5916\u5c42\u51fd\u6570\u7684\u53d8\u91cf\uff0c\u4f46\u65e0\u6cd5\u4fee\u6539\u5b83\uff08\u9664\u975e\u4f7f\u7528 nonlocal \u5173\u952e\u5b57\uff09\u3002<\/span><\/span>\ndef<\/span> <\/span>outer_function<\/span>():<\/span><\/span>\n    x = <\/span>5<\/span>  <\/span># \u5916\u5c42\u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf<\/span><\/span>\n    <\/span>def<\/span> <\/span>inner_function<\/span>():<\/span><\/span>\n        <\/span>print<\/span>(x)  <\/span># \u5185\u5c42\u51fd\u6570\u53ef\u4ee5\u8bbf\u95ee\u5916\u5c42\u51fd\u6570\u7684\u5c40\u90e8\u53d8\u91cf<\/span><\/span>\n    inner_function()<\/span><\/span>\nouter_function()  <\/span># \u8f93\u51fa: 5<\/span><\/span>\n<\/span>\n# 3. \u5168\u5c40\u4f5c\u7528\u57df\uff08Global\uff09<\/span><\/span>\n# \u5168\u5c40\u53d8\u91cf\u662f\u5728\u51fd\u6570\u4e4b\u5916\u5b9a\u4e49\u7684\uff0c\u53ef\u4ee5\u5728\u6574\u4e2a\u6a21\u5757\u4e2d\u8bbf\u95ee\u3002\u5982\u679c\u5728\u51fd\u6570\u5185\u90e8\u8981\u4fee\u6539\u5168\u5c40\u53d8\u91cf\uff0c\u5fc5\u987b\u4f7f\u7528 global \u5173\u952e\u5b57\u3002<\/span><\/span>\nx = <\/span>20<\/span>  <\/span># \u5168\u5c40\u53d8\u91cf<\/span><\/span>\ndef<\/span> <\/span>my_function<\/span>():<\/span><\/span>\n    <\/span>print<\/span>(x)  <\/span># \u5728\u51fd\u6570\u5185\u90e8\u8bbf\u95ee\u5168\u5c40\u53d8\u91cf<\/span><\/span>\nmy_function()  <\/span># \u8f93\u51fa: 20<\/span><\/span>\n<\/span>\n# 4. \u5185\u7f6e\u4f5c\u7528\u57df\uff08Built-in\uff09<\/span><\/span>\n# \u5185\u7f6e\u4f5c\u7528\u57df\u5305\u542b Python \u89e3\u91ca\u5668\u5185\u7f6e\u7684\u53d8\u91cf\uff0c\u5982 len()\u3001range() \u7b49\u3002\u53ef\u4ee5\u5728\u4efb\u4f55\u5730\u65b9\u8bbf\u95ee\u8fd9\u4e9b\u5185\u7f6e\u7684\u51fd\u6570\u6216\u5e38\u91cf\u3002<\/span><\/span>\nprint<\/span>(<\/span>len<\/span>([<\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>]))  <\/span># \u5185\u7f6e\u51fd\u6570 len()\uff0c\u8f93\u51fa: 3<\/span><\/span>\n<\/span><\/code><\/pre><\/div>\n\n\n\n
    LEGB \u89c4\u5219<\/h3>\n\n\n\n
    Python \u53d8\u91cf\u4f5c\u7528\u57df\u7684\u67e5\u627e\u987a\u5e8f\u662f\uff1a<\/p>\n\n\n\n
      \n
    1. Local\uff08\u5c40\u90e8\u4f5c\u7528\u57df\uff09<\/strong>\uff1a\u5f53\u524d\u51fd\u6570\u5185\u5b9a\u4e49\u7684\u53d8\u91cf\u3002<\/li>\n\n\n\n
    2. Enclosing\uff08\u5d4c\u5957\u4f5c\u7528\u57df\uff09<\/strong>\uff1a\u5916\u90e8\u5d4c\u5957\u51fd\u6570\u7684\u53d8\u91cf\u3002<\/li>\n\n\n\n
    3. Global\uff08\u5168\u5c40\u4f5c\u7528\u57df\uff09<\/strong>\uff1a\u6a21\u5757\u9876\u7ea7\u5b9a\u4e49\u7684\u53d8\u91cf\uff08\u5373\u6574\u4e2a\u6587\u4ef6\uff09\u3002<\/li>\n\n\n\n
    4. Built-in\uff08\u5185\u7f6e\u4f5c\u7528\u57df\uff09<\/strong>\uff1aPython \u9884\u5b9a\u4e49\u7684\u53d8\u91cf\u548c\u51fd\u6570\uff0c\u5982 len<\/code>\u3001str<\/code>\u3002<\/li>\n<\/ol>\n\n\n\n
      \u67e5\u627e\u53d8\u91cf\u65f6\uff0cPython \u4f1a\u6309\u7167\u8fd9\u4e2a\u987a\u5e8f\u9010\u5c42\u67e5\u627e\uff0c\u76f4\u5230\u627e\u5230\u53d8\u91cf\u3002\u5982\u679c\u672a\u627e\u5230\uff0c\u5219\u629b\u51fa NameError<\/code>\u3002<\/p>\n\n\n\n
      \u6a21\u5757\u5bfc\u5165<\/h2>\n\n\n\n
      Python<\/span><\/path><\/path><\/svg><\/span>
      # \u5bfc\u5165\u65b9\u5f0f<\/span><\/span>\n# import <\/span><\/span>\n# import ... as ...<\/span><\/span>\n# from ... import ...<\/span><\/span>\n# from ... import *<\/span><\/span>\n# \u4f7f\u7528\u524d\u4e24\u79cd\u65b9\u5f0f \u9700\u8981\u4f7f\u7528\u6a21\u5757\u540d.\u7c7b\u540d.\u65b9\u6cd5<\/span><\/span>\n<\/span>\n# \u4f8b\u5b50\uff1a\u5bfc\u5165datetime\u6a21\u5757\u91cc\u7684datetime\u7c7b<\/span><\/span>\nfrom<\/span> datetime <\/span>import<\/span> datetime<\/span><\/span>\nprint<\/span>(datetime.now())<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      \u5b57\u5178\u952e\u503c<\/h2>\n\n\n\n
      Python\u7684\u5b57\u5178\uff08dict\uff09\u5e95\u5c42\u57fa\u4e8e\u54c8\u5e0c\u8868\uff0c\u503c\u53ef\u4ee5\u53d6\u4efb\u4f55\u6570\u636e\u7c7b\u578b\uff0c\u4f46\u952e\u5fc5\u987b\u662f\u4e0d\u53ef\u53d8\u7684<\/strong>\uff0c\u5982\u5b57\u7b26\u4e32\u3001\u6570\u5b57\uff0c\u751a\u81f3\u5143\u7ec4\u4e5f\u53ef\u4ee5<\/p>\n\n\n\n
      \u53ef\u53d8\u5bf9\u8c61\u4e0e\u4e0d\u53ef\u53d8\u5bf9\u8c61<\/h2>\n\n\n\n
      \u4e0d\u53ef\u53d8\u5bf9\u8c61: bool\uff0cint\uff0cfloat\uff0ctuple\uff0cstr\u2026<\/p>\n\n\n\n
      \u53ef\u53d8\u5bf9\u8c61: list\uff0cdict\uff0cset<\/p>\n\n\n\n
      \u51fd\u6570\u53ef\u53d8\u53c2\u6570\u4f20\u9012<\/h2>\n\n\n\n
      \u7528\u6765\u5904\u7406\u53ef\u53d8\u53c2\u6570\uff0c\u63a5\u6536\u53c2\u6570\u540e\uff0cargs\u4f1a\u53d8\u6210\u4e00\u4e2atuple\uff0ckwargs\u4f1a\u53d8\u6210\u4e00\u4e2adict<\/p>\n\n\n\n
      \u5143\u7ec4\u521d\u59cb\u5316<\/h2>\n\n\n\n
      \u4f7f\u7528\u62ec\u53f7\u7684\u65b9\u5f0f\u521d\u59cb\u5316\u5355\u5143\u7d20\u5143\u7ec4\u65f6\uff0c\u9700\u8981\u6dfb\u52a0\u4e00\u4e2a\u9017\u53f7\uff0c\u5426\u5219\u62ec\u53f7\u4f1a\u88ab\u8ba4\u4e3a\u662f\u8fd0\u7b97\u7b26\u3002<\/p>\n\n\n\n
      Python<\/span><\/path><\/path><\/svg><\/span>
      a=(<\/span>1<\/span>,) <\/span># \u6b63\u786e<\/span><\/span>\na=(<\/span>1<\/span>) <\/span># \u9519\u8bef<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      \u4e09\u5143\u8868\u8fbe\u5f0f<\/h2>\n\n\n\n
      condition_is_true if condition else condition_is_false<\/p>\n\n\n\n
      Python<\/span><\/path><\/path><\/svg><\/span>
      condition_is_true <\/span>if<\/span> condition <\/span>else<\/span> condition_is_false<\/span><\/span>\n# \u4f8b\u5b50<\/span><\/span>\nmax<\/span> = num <\/span>if<\/span> num><\/span>max<\/span> <\/span>else<\/span> <\/span>max<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      lambda\uff08\u533f\u540d\u51fd\u6570\uff09<\/h2>\n\n\n\n
      Python \u4f7f\u7528 lambda<\/strong> \u6765\u521b\u5efa\u533f\u540d\u51fd\u6570\u3002<\/p>\n\n\n\n
      lambda \u51fd\u6570\u662f\u4e00\u79cd\u5c0f\u578b\u3001\u533f\u540d\u7684\u3001\u5185\u8054\u51fd\u6570\uff0c\u5b83\u53ef\u4ee5\u5177\u6709\u4efb\u610f\u6570\u91cf\u7684\u53c2\u6570\uff0c\u4f46\u53ea\u80fd\u6709\u4e00\u4e2a\u8868\u8fbe\u5f0f\u3002<\/p>\n\n\n\n
      \u533f\u540d\u51fd\u6570\u4e0d\u9700\u8981\u4f7f\u7528 def<\/strong> \u5173\u952e\u5b57\u5b9a\u4e49\u5b8c\u6574\u51fd\u6570\u3002<\/p>\n\n\n\n
      lambda \u51fd\u6570\u901a\u5e38\u7528\u4e8e\u7f16\u5199\u7b80\u5355\u7684\u3001\u5355\u884c\u7684\u51fd\u6570\uff0c\u901a\u5e38\u5728\u9700\u8981\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7684\u60c5\u51b5\u4e0b\u4f7f\u7528\uff0c\u4f8b\u5982\u5728 map()\u3001filter()\u3001reduce() \u7b49\u51fd\u6570\u4e2d\u3002<\/p>\n\n\n\n
      Python<\/span><\/path><\/path><\/svg><\/span>
      # \u65e0\u8f93\u5165\u53c2\u6570<\/span><\/span>\nf = <\/span>lambda<\/span>: <\/span>"Hello, world!"<\/span><\/span>\nprint<\/span>(f())  <\/span># \u8f93\u51fa: Hello, world!<\/span><\/span>\n<\/span>\n# \u6709\u8f93\u5165\u53c2\u6570<\/span><\/span>\nx = <\/span>lambda<\/span> <\/span>a<\/span> : a + <\/span>10<\/span><\/span>\nprint<\/span>(x(<\/span>5<\/span>)) <\/span># \u8f93\u51fa\uff1a15<\/span><\/span>\nx = <\/span>lambda<\/span> <\/span>a<\/span>, <\/span>b<\/span> : a * b<\/span><\/span>\nprint<\/span>(x(<\/span>5<\/span>, <\/span>6<\/span>)) <\/span># \u8f93\u51fa\uff1a30<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      lambda \u51fd\u6570\u901a\u5e38\u4e0e\u5185\u7f6e\u51fd\u6570\u5982 map()\u3001filter() \u548c reduce() \u4e00\u8d77\u4f7f\u7528\uff0c\u4ee5\u4fbf\u5728\u96c6\u5408\u4e0a\u6267\u884c\u64cd\u4f5c\u3002\u4f8b\u5982\uff1a<\/p>\n\n\n\n
      Python<\/span><\/path><\/path><\/svg><\/span>
      numbers = [<\/span>1<\/span>, <\/span>2<\/span>, <\/span>3<\/span>, <\/span>4<\/span>, <\/span>5<\/span>]<\/span><\/span>\nsquared = <\/span>list<\/span>(<\/span>map<\/span>(<\/span>lambda<\/span> <\/span>x<\/span>: x**<\/span>2<\/span>, numbers))<\/span><\/span>\nprint<\/span>(squared)  <\/span># \u8f93\u51fa: [1, 4, 9, 16, 25]<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
      \u5e38\u89c1\u6a21\u5757\u4f7f\u7528<\/h2>\n\n\n\n
      sys\u6a21\u5757<\/h3>\n\n\n\n
        \n
      • sys.argv<\/strong>\uff1a\u53ef\u4ee5\u7528sys.argv<\/code>\u83b7\u53d6\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u547d\u4ee4\u884c\u53c2\u6570\u7684\u53c2\u6570\u5217\u8868(list)\u3002\n
          \n
        • sys.argv[0] \u5f53\u524d\u7a0b\u5e8f\u540d<\/li>\n\n\n\n
        • sys.argv[1] \u7b2c\u4e00\u4e2a\u53c2\u6570<\/li>\n\n\n\n
        • sys.argv[0] \u7b2c\u4e8c\u4e2a\u53c2\u6570<\/li>\n\n\n\n
        • …\u4ee5\u6b64\u7c7b\u63a8<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n
          \u53c2\u8003\u4ee3\u7801<\/p>\n\n\n\n
          Python<\/span><\/path><\/path><\/svg><\/span>
          # encoding: utf-8<\/span><\/span>\n# filename: argv_test.py<\/span><\/span>\nimport<\/span> sys<\/span><\/span>\n<\/span>\n# \u83b7\u53d6\u811a\u672c\u540d\u5b57<\/span><\/span>\nprint<\/span> <\/span>'The name of this program is: <\/span>%s<\/span>'<\/span> %(sys.argv[<\/span>0<\/span>])<\/span><\/span>\n# \u83b7\u53d6\u53c2\u6570\u5217\u8868<\/span><\/span>\nprint<\/span> <\/span>'The command line arguments are:'<\/span><\/span>\nfor<\/span> i <\/span>in<\/span> sys.argv:<\/span><\/span>\n    <\/span>print<\/span> i<\/span><\/span>\n# \u7edf\u8ba1\u53c2\u6570\u4e2a\u6570<\/span><\/span>\nprint<\/span> <\/span>'There are <\/span>%s<\/span> arguments.'<\/span>%(<\/span>len<\/span>(sys.argv)-<\/span>1<\/span>)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
          \u8f93\u51fa\u7ed3\u679c<\/p>\n\n\n\n
          Python<\/span><\/path><\/path><\/svg><\/span>
          The name of this program <\/span>is<\/span>: argv_test.py<\/span><\/span>\nThe command line arguments are:<\/span><\/span>\nargv_test.py<\/span><\/span>\narg1<\/span><\/span>\narg2<\/span><\/span>\narg3<\/span><\/span>\nThere are <\/span>3<\/span> arguments.<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
            \n
          • sys.platform<\/strong>\uff1a\u83b7\u53d6\u5f53\u524d\u6267\u884c\u73af\u5883\u7684\u5e73\u53f0\uff0c\u5982win32<\/code>\u8868\u793a\u662fWindows 32bit\u64cd\u4f5c\u7cfb\u7edf\uff0clinux2<\/code>\u8868\u793a\u662flinux\u5e73\u53f0\uff1b<\/li>\n\n\n\n
          • sys.path<\/strong>\uff1apath\u662f\u4e00\u4e2a\u76ee\u5f55\u5217\u8868\uff0c\u4f9bPython\u4ece\u4e2d\u67e5\u627e\u7b2c\u4e09\u65b9\u6269\u5c55\u6a21\u5757\u3002\u5728python\u542f\u52a8\u65f6\uff0csys.path<\/code>\u6839\u636e\u5185\u5efa\u89c4\u5219\u3001PYTHONPATH\u53d8\u91cf\u8fdb\u884c\u521d\u59cb\u5316\u3002<\/li>\n\n\n\n
          • sys.exit(n)<\/strong>\uff1a\u8c03\u7528sys.exit(n)<\/code>\u53ef\u4ee5\u4e2d\u9014\u9000\u51fa\u7a0b\u5e8f\uff0c\u5f53\u53c2\u6570\u975e0\u65f6\uff0c\u4f1a\u5f15\u53d1\u4e00\u4e2aSystemExit<\/code>\u5f02\u5e38\uff0c\u4ece\u800c\u53ef\u4ee5\u5728\u4e3b\u7a0b\u5e8f\u4e2d\u6355\u83b7\u8be5\u5f02\u5e38\u3002<\/li>\n<\/ul>\n\n\n\n
            os\u6a21\u5757<\/h3>\n\n\n\n
            os \u6a21\u5757\u5e38\u7528\u65b9\u6cd5 \u76f8\u5e94\u7684\u4f5c\u7528<\/p>\n\n\n\n
              \n
            • os.chdir(path) \u6539\u53d8\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55\uff0cpath\u5fc5\u987b\u4e3a\u5b57\u7b26\u4e32\u5f62\u5f0f\u7684\u76ee\u5f55<\/li>\n\n\n\n
            • os.getcwd() \u8fd4\u56de\u5f53\u524d\u5de5\u4f5c\u76ee\u5f55<\/li>\n\n\n\n
            • os.listdir(path) \u5217\u4e3e\u6307\u5b9a\u76ee\u5f55\u7684\u6587\u4ef6\u540d<\/li>\n\n\n\n
            • os.mkdir(path) \u521b\u5efapath\u6307\u5b9a\u7684\u6587\u4ef6\u5939,\u53ea\u80fd\u521b\u5efa\u4e00\u4e2a\u5355\u5c42\u6587\u4ef6\uff0c\u800c\u4e0d\u80fd\u5d4c\u5957\u521b\u5efa\uff0c\u82e5\u6587\u4ef6\u5939\u5b58\u5728\u5219\u4f1a\u629b\u51fa\u5f02\u5e38<\/li>\n\n\n\n
            • os.makedirs(path) \u521b\u5efa\u591a\u5c42\u76ee\u5f55 \uff0c\u53ef\u4ee5\u5d4c\u5957\u521b\u5efa<\/li>\n\n\n\n
            • os.move(file_name) \u5220\u9664\u6307\u5b9a\u6587\u4ef6<\/li>\n\n\n\n
            • os.rmdir(path) \u5220\u9664\u5355\u5c42\u76ee\u5f55\uff0c\u9047\u89c1\u76ee\u5f55\u975e\u7a7a\u65f6\u5219\u4f1a\u629b\u51fa\u5f02\u5e38<\/li>\n\n\n\n
            • os.removedirs(path) \u9010\u5c42\u5220\u9664\u591a\u5c42\u76ee\u5f55<\/li>\n\n\n\n
            • os.rename(old,new) \u6587\u4ef6old\u91cd\u547d\u540d\u4e3anew<\/li>\n\n\n\n
            • os.system(command) \u8fd0\u884c\u7cfb\u7edf\u7684\u547d\u4ee4\u7a97\u53e3<\/li>\n\n\n\n
            • os.walk(dir)\u4ee5\u9012\u5f52\u7684\u65b9\u5f0f\u904d\u5386\u6587\u4ef6\u5939\uff0c\u8fd4\u56de\u503c\u4e3a\u8fed\u4ee3\u5668\u5bf9\u8c61\uff0c\u6bcf\u4e2a\u5bf9\u8c61\u4e3a\u4e00\u4e2a\u4e09\u5143\u7ec4(dirpath, dirnames, filenames)\uff0cdirpath\u4e3a\u76ee\u5f55\uff0cdirnames\u4e3a\u8fd9\u4e2a\u76ee\u5f55\u4e0b\u7684\u5b50\u76ee\u5f55\u540d\uff0cfilenames\u4e3a\u8fd9\u4e2a\u76ee\u5f55\u4e0b\u7684\u6240\u6709\u6587\u4ef6\u540d<\/li>\n<\/ul>\n\n\n\n
              os.path \u6a21\u5757\u5e38\u7528\u65b9\u6cd5 \u76f8\u5e94\u7684\u4f5c\u7528<\/p>\n\n\n\n
                \n
              • abspath(path) \u8fd4\u56de\u6587\u4ef6\u6216\u76ee\u5f55\u7684\u7edd\u5bf9\u8def\u5f84<\/li>\n\n\n\n
              • basename(path) \u8fd4\u56depath\u8def\u5f84\u6700\u540e\u4e00\u4e2a\\\u540e\u7684\u5185\u5bb9\uff0c\u53ef\u4ee5\u4e3a\u7a7a<\/li>\n\n\n\n
              • dirname(path) \u8fd4\u56depath\u8def\u5f84\u6700\u540e\u4e00\u4e2a\\\u4e4b\u524d\u7684\u5185\u5bb9<\/li>\n\n\n\n
              • split(path) \u8fd4\u56de\u4e00\u4e2a\uff08head,tail\uff09\u5143\u7ec4\uff0chead\u4e3a\u6700\u540e\\\u4e4b\u524d\u7684\u5185\u5bb9\uff1btail\u4e3a\u6700\u540e\\\u4e4b\u540e\u7684\u5185\u5bb9\uff0c\u53ef\u4ee5\u4e3a\u7a7a<\/li>\n\n\n\n
              • splitext(path) \u8fd4\u56de\u6307\u5411\u6587\u4ef6\u7684\u8def\u5f84\u548c\u6269\u5c55\u540d<\/li>\n\n\n\n
              • exists(path) \u67e5\u8be2\u8def\u5f84path\u662f\u5426\u5b58\u5728<\/li>\n\n\n\n
              • isabs(s) \u5224\u65ad\u6307\u5b9a\u8def\u5f84s\u662f\u5426\u4e3a\u7edd\u5bf9\u8def\u5f84<\/li>\n\n\n\n
              • isdir(path) \u5224\u65adpath\u6307\u5411\u7684\u662f\u5426\u662f\u6587\u4ef6\u5939<\/li>\n\n\n\n
              • isfile(path) \u5224\u65adpath\u662f\u5426\u6307\u5411\u6587\u4ef6<\/li>\n\n\n\n
              • join(path,*path) \u5c06\u4e24\u4e2apath\u901a\u8fc7\\\u7ec4\u5408\u5728\u4e00\u8d77\uff0c\u6216\u5c06\u66f4\u591apath\u7ec4\u5408\u5728\u4e00\u8d77<\/li>\n\n\n\n
              • getatime(filename) \u8fd4\u56de\u6587\u4ef6\u7684\u6700\u8fd1\u8bbf\u95ee\u65f6\u95f4,\u8fd4\u56de\u7684\u662f\u6d6e\u70b9\u6570\u65f6\u95f4<\/li>\n\n\n\n
              • getctime(filename) \u8fd4\u56de\u6587\u4ef6\u7684\u521b\u5efa\u65f6\u95f4<\/li>\n\n\n\n
              • getmtime(filename) \u8fd4\u56de\u6587\u4ef6\u7684\u4fee\u6539\u65f6\u95f4<\/li>\n<\/ul>\n\n\n\n
                datetime\u6a21\u5757<\/h3>\n\n\n\n
                  \n
                • datetime.now() \u8fd4\u56de\u5f53\u524d\u7684\u65e5\u671f\u548c\u65f6\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n
                  Python<\/span><\/path><\/path><\/svg><\/span>
                  import<\/span> datetime<\/span><\/span>\nnow = datetime.datetime.now()<\/span><\/span>\nprint<\/span>(now)  <\/span># \u5982\uff1a2024-10-14 10:45:23.123456<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                    \n
                  • datetime.strptime() \u5c06\u5b57\u7b26\u4e32\u89e3\u6790\u4e3a datetime \u5bf9\u8c61\u3002\u9700\u8981\u6307\u5b9a\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n
                    Python<\/span><\/path><\/path><\/svg><\/span>
                    import<\/span> datetime<\/span><\/span>\ndate_string = <\/span>"2024-10-14 10:45:23"<\/span><\/span>\ndate_object = datetime.datetime.strptime(date_string, <\/span>"%Y-%m-<\/span>%d<\/span> %H:%M:%S"<\/span>)<\/span><\/span>\nprint<\/span>(date_object)  <\/span># 2024-10-14 10:45:23<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                      \n
                    • datetime.strftime() \u5c06 datetime \u5bf9\u8c61\u683c\u5f0f\u5316\u4e3a\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n
                      Python<\/span><\/path><\/path><\/svg><\/span>
                      import<\/span> datetime<\/span><\/span>\nnow = datetime.datetime.now()<\/span><\/span>\ndate_string = now.strftime(<\/span>"%Y-%m-<\/span>%d<\/span> %H:%M:%S"<\/span>)<\/span><\/span>\nprint<\/span>(date_string)  <\/span># \u5982\uff1a2024-10-14 10:45:23<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                        \n
                      • datetime.timedelta() \u7528\u4e8e\u65f6\u95f4\u7684\u52a0\u51cf\u6cd5\u64cd\u4f5c\u3002\u53ef\u4ee5\u8868\u793a\u65f6\u95f4\u7684\u5dee\u503c\uff0c\u5982\u5929\u6570\u3001\u5c0f\u65f6\u3001\u5206\u949f\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n
                        Python<\/span><\/path><\/path><\/svg><\/span>
                        import<\/span> datetime<\/span><\/span>\nnow = datetime.datetime.now()<\/span><\/span>\ndelta = datetime.timedelta(<\/span>days<\/span>=<\/span>5<\/span>)<\/span><\/span>\nfuture = now + delta  <\/span># 5\u5929\u540e<\/span><\/span>\nprint<\/span>(future)  <\/span># \u5982\uff1a2024-10-19 10:45:23<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                        time\u6a21\u5757<\/h3>\n\n\n\n
                          \n
                        • time.time() \u8fd4\u56de\u5f53\u524d\u65f6\u95f4\u7684\u65f6\u95f4\u6233\uff08\u4ece Unix \u7eaa\u5143\uff081970\u5e741\u67081\u65e5\uff09\u5f00\u59cb\u7684\u79d2\u6570\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
                          Python<\/span><\/path><\/path><\/svg><\/span>
                          import<\/span> time<\/span><\/span>\ntimestamp = time.time()<\/span><\/span>\nprint<\/span>(timestamp)  <\/span># \u5982\uff1a1697255179.123456<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                            \n
                          • time.sleep() \u4f7f\u7a0b\u5e8f\u6682\u505c\u6267\u884c\u6307\u5b9a\u7684\u79d2\u6570\u3002<\/li>\n<\/ul>\n\n\n\n
                            Python<\/span><\/path><\/path><\/svg><\/span>
                            import<\/span> time<\/span><\/span>\nprint<\/span>(<\/span>"Start"<\/span>)<\/span><\/span>\ntime.sleep(<\/span>2<\/span>)  <\/span># \u7a0b\u5e8f\u6682\u505c 2 \u79d2<\/span><\/span>\nprint<\/span>(<\/span>"End"<\/span>)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                              \n
                            • time.localtime() \u5c06\u65f6\u95f4\u6233\u8f6c\u6362\u4e3a\u7ed3\u6784\u5316\u7684\u672c\u5730\u65f6\u95f4\uff08struct_time \u5bf9\u8c61\uff09\u3002<\/li>\n<\/ul>\n\n\n\n
                              Python<\/span><\/path><\/path><\/svg><\/span>
                              import<\/span> time<\/span><\/span>\nlocal_time = time.localtime()<\/span><\/span>\nprint<\/span>(local_time)  <\/span># \u5982\uff1atime.struct_time(tm_year=2024, tm_mon=10, tm_mday=14, ...)<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                                \n
                              • time.strftime() \u6839\u636e\u683c\u5f0f\u5316\u5b57\u7b26\u4e32\u5c06 struct_time \u6216\u65f6\u95f4\u6233\u8f6c\u6362\u4e3a\u53ef\u8bfb\u7684\u65f6\u95f4\u5b57\u7b26\u4e32\u3002<\/li>\n<\/ul>\n\n\n\n
                                Python<\/span><\/path><\/path><\/svg><\/span>
                                import<\/span> time<\/span><\/span>\nformatted_time = time.strftime(<\/span>"%Y-%m-<\/span>%d<\/span> %H:%M:%S"<\/span>, time.localtime())<\/span><\/span>\nprint<\/span>(formatted_time)  <\/span># \u5982\uff1a2024-10-14 10:45:23<\/span><\/span><\/code><\/pre><\/div>\n\n\n\n
                                io\u548c\u8bfb\u5199\u6587\u4ef6<\/h2>\n\n\n\n
                                Python<\/span><\/path><\/path><\/svg><\/span>
                                f = <\/span>open<\/span>(filename, <\/span>mode<\/span>=<\/span>'r'<\/span>)<\/span><\/span>\n# file: \u6587\u4ef6\u8def\u5f84\uff08\u5b57\u7b26\u4e32\uff09\u3002\u53ef\u4ee5\u662f\u76f8\u5bf9\u8def\u5f84\u6216\u7edd\u5bf9\u8def\u5f84\u3002<\/span><\/span>\n# mode: \u6587\u4ef6\u6253\u5f00\u6a21\u5f0f\uff0c\u51b3\u5b9a\u4e86\u6587\u4ef6\u5982\u4f55\u88ab\u5904\u7406\u3002\u5e38\u89c1\u6a21\u5f0f\u6709\uff1a<\/span><\/span>\n'r'<\/span>: \u4ee5\u53ea\u8bfb\u6a21\u5f0f\u6253\u5f00\uff08\u9ed8\u8ba4\uff09\u3002<\/span><\/span>\n'w'<\/span>: \u4ee5\u5199\u5165\u6a21\u5f0f\u6253\u5f00\uff0c\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\u4f1a\u521b\u5efa\u6587\u4ef6\uff1b\u5982\u679c\u6587\u4ef6\u5b58\u5728\u5219\u6e05\u7a7a\u6587\u4ef6\u3002<\/span><\/span>\n'a'<\/span>: \u4ee5\u8ffd\u52a0\u6a21\u5f0f\u6253\u5f00\uff0c\u6570\u636e\u4f1a\u88ab\u5199\u5165\u5230\u6587\u4ef6\u672b\u5c3e\u3002<\/span><\/span>\n'b'<\/span>: \u4ee5\u4e8c\u8fdb\u5236\u6a21\u5f0f\u6253\u5f00\uff08\u53ef\u4ee5\u4e0e\u5176\u4ed6\u6a21\u5f0f\u4e00\u8d77\u4f7f\u7528\uff0c\u5982 <\/span>'rb'<\/span>\u3001<\/span>'wb'<\/span>\uff09\u3002<\/span><\/span>\n't'<\/span>: \u4ee5\u6587\u672c\u6a21\u5f0f\u6253\u5f00\uff08\u9ed8\u8ba4\uff0c\u4e0e\u5176\u4ed6\u6a21\u5f0f\u7ec4\u5408\u4f7f\u7528\uff0c\u5982 <\/span>'rt'<\/span>\uff09\u3002<\/span><\/span>\n'x'<\/span>: \u4ee5\u72ec\u5360\u521b\u5efa\u6a21\u5f0f\u6253\u5f00\uff0c\u6587\u4ef6\u4e0d\u5b58\u5728\u5219\u521b\u5efa\uff0c\u5b58\u5728\u5219\u5f15\u53d1\u9519\u8bef\u3002<\/span><\/span>\n'+'<\/span>: \u6253\u5f00\u6587\u4ef6\u8fdb\u884c\u66f4\u65b0\uff08\u8bfb\u548c\u5199\uff09\uff0c\u53ef\u4ee5\u4e0e\u5176\u4ed6\u6a21\u5f0f\u7ec4\u5408\u4f7f\u7528\uff0c\u5982 <\/span>'r+'<\/span>\u3001<\/span>'w+'<\/span> \u7b49\u3002<\/span><\/span>\n<\/span>\n# \u5e38\u89c1\u7528\u6cd5<\/span><\/span>\n# \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9<\/span><\/span>\nwith<\/span> <\/span>open<\/span>(<\/span>'example.txt'<\/span>, <\/span>'r'<\/span>) <\/span>as<\/span> file:<\/span><\/span>\n    content = file.read()<\/span><\/span>\n    <\/span>print<\/span>(content)<\/span><\/span>\n# \u5199\u5165\u6587\u4ef6<\/span><\/span>\nwith<\/span> <\/span>open<\/span>(<\/span>'example.txt'<\/span>, <\/span>'w'<\/span>) <\/span>as<\/span> file:<\/span><\/span>\n    file.write(<\/span>'Hello, World!'<\/span>)<\/span><\/span>\n# \u8ffd\u52a0\u5199\u5165\u6587\u4ef6<\/span><\/span>\nwith<\/span> <\/span>open<\/span>(<\/span>'example.txt'<\/span>, <\/span>'a'<\/span>) <\/span>as<\/span> file:<\/span><\/span>\n    file.write(<\/span>'<\/span>\\n<\/span>Appending this line.'<\/span>)<\/span><\/span>\n# \u9010\u884c\u8bfb\u53d6\u6587\u4ef6<\/span><\/span>\nwith<\/span> <\/span>open<\/span>(<\/span>'example.txt'<\/span>, <\/span>'r'<\/span>) <\/span>as<\/span> file:<\/span><\/span>\n    <\/span>for<\/span> line <\/span>in<\/span> file:<\/span><\/span>\n        <\/span>print<\/span>(line.strip())  <\/span># \u53bb\u9664\u6362\u884c\u7b26<\/span><\/span>\n<\/span>\n# \u4f7f\u7528 with open(...) as \u662f\u63a8\u8350\u65b9\u5f0f\uff0c\u56e0\u4e3a\u5b83\u4f1a\u5728 with \u5757\u7ed3\u675f\u65f6\u81ea\u52a8\u5173\u95ed\u6587\u4ef6\uff0c\u9632\u6b62\u8d44\u6e90\u6cc4\u6f0f\u3002<\/span><\/span>\n# \u5982\u679c\u4e0d\u4f7f\u7528with open\uff0c\u76f4\u63a5f = open()\uff0c\u5219\u9700\u8981f.close()\u624b\u52a8\u5173\u95ed<\/span><\/span>\n# \u6b64\u5916open()\u8fd8\u53ef\u4ee5\u52a0\u4e0a encoding='utf-8'\u53c2\u6570\uff0c\u4ee5\u9632\u6b62\u7f16\u7801\u95ee\u9898<\/span><\/span><\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
                                \u7528Python\u505a\u673a\u8bd5\u9898\u7684\u4e00\u4e9b\u57fa\u7840\u77e5\u8bc6 \u8f93\u5165\u8f93\u51fa\u90e8\u5206 \u6570\u636e\u5904\u7406\u90e8\u5206 \u6392\u5e8f \u5bb9\u5668\u76f8\u5173 \u5f02\u5e38\u5904\u7406 \u9762\u5411\u5bf9\u8c61\u57fa\u7840 \u53c2\u6570 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-45","post","type-post","status-publish","format-standard","hentry","category-4"],"yoast_head":"\nPython\u57fa\u7840\u77e5\u8bc6\uff08\u673a\u8bd5\u590d\u4e60\u7528\uff09 - LeezP\u2018s Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/leezp.top\/?p=45\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python\u57fa\u7840\u77e5\u8bc6\uff08\u673a\u8bd5\u590d\u4e60\u7528\uff09 - 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