{"id":1144692,"date":"2025-01-08T23:01:55","date_gmt":"2025-01-08T15:01:55","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1144692.html"},"modified":"2025-01-08T23:01:57","modified_gmt":"2025-01-08T15:01:57","slug":"python%e5%a6%82%e4%bd%95%e8%ae%a1%e7%ae%97%e4%b8%89%e4%b8%aa%e5%ad%97%e7%ac%a6%e7%9a%84%e6%8e%92%e5%88%97%e7%bb%84%e5%90%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1144692.html","title":{"rendered":"python\u5982\u4f55\u8ba1\u7b97\u4e09\u4e2a\u5b57\u7b26\u7684\u6392\u5217\u7ec4\u5408"},"content":{"rendered":"

\"python\u5982\u4f55\u8ba1\u7b97\u4e09\u4e2a\u5b57\u7b26\u7684\u6392\u5217\u7ec4\u5408\"<\/p>\n

Python \u8ba1\u7b97\u4e09\u4e2a\u5b57\u7b26\u7684\u6392\u5217\u7ec4\u5408\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 itertools \u5e93\u3001\u901a\u8fc7\u9012\u5f52\u5b9e\u73b0\u3001\u5229\u7528\u4ea4\u6362\u751f\u6210\u6cd5<\/strong>\u3002\u672c\u6587\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u4e09\u79cd\u65b9\u6cd5\uff0c\u5e2e\u52a9\u4f60\u7406\u89e3\u5e76\u638c\u63e1\u5982\u4f55\u5728 Python \u4e2d\u8ba1\u7b97\u5b57\u7b26\u6392\u5217\u7ec4\u5408\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528 itertools \u5e93<\/h3>\n<\/p>\n

Python \u7684 itertools<\/code> \u5e93\u63d0\u4f9b\u4e86\u7b80\u5355\u76f4\u63a5\u7684\u65b9\u6cd5\u6765\u751f\u6210\u6392\u5217\u7ec4\u5408\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 itertools.permutations<\/code> \u6765\u751f\u6210\u5b57\u7b26\u7684\u6240\u6709\u6392\u5217\u3002<\/p>\n<\/p>\n

1.1 \u5bfc\u5165 itertools \u5e93<\/h4>\n<\/p>\n

\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u5bfc\u5165 itertools \u5e93\uff1a<\/p>\n<\/p>\n

import itertools<\/p>\n
<\/code><\/pre>\n<\/p>\n
1.2 \u4f7f\u7528 permutations \u65b9\u6cd5<\/h4>\n<\/p>\n
itertools.permutations<\/code> \u65b9\u6cd5\u53ef\u4ee5\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u6392\u5217\u3002\u8ba9\u6211\u4eec\u5047\u8bbe\u4e09\u4e2a\u5b57\u7b26\u662f 'A', 'B', 'C'\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\u4f7f\u7528 permutations \u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
chars = ['A', 'B', 'C']<\/p>\n
permutations = list(itertools.permutations(chars))<\/p>\n
print(permutations)<\/p>\n
<\/code><\/pre>\n<\/p>\n
1.3 \u7ed3\u679c\u89e3\u6790<\/h4>\n<\/p>\n
\u8f93\u51fa\u7ed3\u679c\u4f1a\u662f\u6240\u6709\u53ef\u80fd\u7684\u6392\u5217\u7ec4\u5408\uff1a<\/p>\n<\/p>\n
[('A', 'B', 'C'), ('A', 'C', 'B'), ('B', 'A', 'C'), ('B', 'C', 'A'), ('C', 'A', 'B'), ('C', 'B', 'A')]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u901a\u8fc7\u9012\u5f52\u5b9e\u73b0<\/h3>\n<\/p>\n
\u9012\u5f52\u662f\u4e00\u79cd\u89e3\u51b3\u6392\u5217\u7ec4\u5408\u95ee\u9898\u7684\u7ecf\u5178\u65b9\u6cd5\u3002\u6211\u4eec\u53ef\u4ee5\u7f16\u5199\u4e00\u4e2a\u9012\u5f52\u51fd\u6570\u6765\u751f\u6210\u6240\u6709\u6392\u5217\u3002<\/p>\n<\/p>\n
2.1 \u7f16\u5199\u9012\u5f52\u51fd\u6570<\/h4>\n<\/p>\n
\u9012\u5f52\u51fd\u6570\u7684\u6838\u5fc3\u601d\u60f3\u662f\uff1a\u9009\u62e9\u4e00\u4e2a\u5b57\u7b26\u4f5c\u4e3a\u9996\u5b57\u7b26\uff0c\u7136\u540e\u5bf9\u5269\u4f59\u5b57\u7b26\u9012\u5f52\u6c42\u89e3\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\u4ee3\u7801\uff1a<\/p>\n<\/p>\n
def permute(chars):<\/p>\n
    if len(chars) == 1:<\/p>\n
        return [chars]<\/p>\n
    permutations = []<\/p>\n
    for i in range(len(chars)):<\/p>\n
        current = chars[i]<\/p>\n
        remAI<\/a>ning = chars[:i] + chars[i+1:]<\/p>\n
        for p in permute(remaining):<\/p>\n
            permutations.append([current] + p)<\/p>\n
    return permutations<\/p>\n
<\/code><\/pre>\n<\/p>\n
2.2 \u8c03\u7528\u9012\u5f52\u51fd\u6570<\/h4>\n<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u8c03\u7528\u4e0a\u9762\u7684\u9012\u5f52\u51fd\u6570\u6765\u751f\u6210\u6392\u5217\u7ec4\u5408\uff1a<\/p>\n<\/p>\n
chars = ['A', 'B', 'C']<\/p>\n
permutations = permute(chars)<\/p>\n
print(permutations)<\/p>\n
<\/code><\/pre>\n<\/p>\n
2.3 \u7ed3\u679c\u89e3\u6790<\/h4>\n<\/p>\n
\u8f93\u51fa\u7ed3\u679c\u4e0e\u4f7f\u7528 itertools \u5e93\u751f\u6210\u7684\u7ed3\u679c\u76f8\u540c\uff1a<\/p>\n<\/p>\n
[['A', 'B', 'C'], ['A', 'C', 'B'], ['B', 'A', 'C'], ['B', 'C', 'A'], ['C', 'A', 'B'], ['C', 'B', 'A']]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u5229\u7528\u4ea4\u6362\u751f\u6210\u6cd5<\/h3>\n<\/p>\n
\u4ea4\u6362\u751f\u6210\u6cd5\u662f\u4e00\u79cd\u901a\u8fc7\u4ea4\u6362\u5b57\u7b26\u4f4d\u7f6e\u6765\u751f\u6210\u6392\u5217\u7684\u65b9\u6cd5\u3002\u8fd9\u79cd\u65b9\u6cd5\u901a\u5e38\u7528\u4e8e\u4e0d\u4f7f\u7528\u989d\u5916\u5e93\u7684\u60c5\u5883\u3002<\/p>\n<\/p>\n
3.1 \u7f16\u5199\u4ea4\u6362\u751f\u6210\u51fd\u6570<\/h4>\n<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4ea4\u6362\u5b57\u7b26\u4f4d\u7f6e\u6765\u751f\u6210\u6240\u6709\u6392\u5217\uff1a<\/p>\n<\/p>\n
def permute(chars, l, r):<\/p>\n
    if l == r:<\/p>\n
        print(''.join(chars))<\/p>\n
    else:<\/p>\n
        for i in range(l, r + 1):<\/p>\n
            chars[l], chars[i] = chars[i], chars[l]<\/p>\n
            permute(chars, l + 1, r)<\/p>\n
            chars[l], chars[i] = chars[i], chars[l]  # backtrack<\/p>\n
<\/code><\/pre>\n<\/p>\n
3.2 \u8c03\u7528\u4ea4\u6362\u751f\u6210\u51fd\u6570<\/h4>\n<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u8c03\u7528\u4e0a\u9762\u7684\u4ea4\u6362\u751f\u6210\u51fd\u6570\u6765\u751f\u6210\u6392\u5217\u7ec4\u5408\uff1a<\/p>\n<\/p>\n
chars = ['A', 'B', 'C']<\/p>\n
permute(chars, 0, len(chars) - 1)<\/p>\n
<\/code><\/pre>\n<\/p>\n
3.3 \u7ed3\u679c\u89e3\u6790<\/h4>\n<\/p>\n
\u8f93\u51fa\u7ed3\u679c\u4f1a\u662f\u6240\u6709\u53ef\u80fd\u7684\u6392\u5217\u7ec4\u5408\uff1a<\/p>\n<\/p>\n
ABC<\/p>\n
ACB<\/p>\n
BAC<\/p>\n
BCA<\/p>\n
CAB<\/p>\n
CBA<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001\u6027\u80fd\u5bf9\u6bd4\u548c\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
4.1 \u6027\u80fd\u5bf9\u6bd4<\/h4>\n<\/p>\n
    \n
  1. itertools \u5e93<\/strong>\uff1a\u4f7f\u7528\u5185\u7f6e\u5e93\u65b9\u6cd5\uff0c\u6027\u80fd\u4f18\u8d8a\uff0c\u4ee3\u7801\u7b80\u6d01\u3002\u9002\u7528\u4e8e\u5927\u591a\u6570\u60c5\u51b5\u3002<\/li>\n
  2. \u9012\u5f52\u65b9\u6cd5<\/strong>\uff1a\u9002\u5408\u7406\u89e3\u9012\u5f52\u601d\u60f3\u53ca\u5176\u5e94\u7528\uff0c\u4f46\u5bf9\u4e8e\u5b57\u7b26\u6570\u8f83\u591a\u7684\u60c5\u51b5\uff0c\u9012\u5f52\u6df1\u5ea6\u53ef\u80fd\u4f1a\u5bfc\u81f4\u6027\u80fd\u95ee\u9898\u3002<\/li>\n
  3. \u4ea4\u6362\u751f\u6210\u6cd5<\/strong>\uff1a\u7406\u89e3\u4ea4\u6362\u751f\u6210\u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\uff0c\u4f46\u4ee3\u7801\u76f8\u5bf9\u590d\u6742\uff0c\u9002\u5408\u4e0d\u4f7f\u7528\u989d\u5916\u5e93\u7684\u60c5\u51b5\u3002<\/li>\n<\/ol>\n
    4.2 \u5e94\u7528\u573a\u666f<\/h4>\n<\/p>\n
      \n
    1. \u5bc6\u7801\u751f\u6210<\/strong>\uff1a\u6392\u5217\u7ec4\u5408\u7b97\u6cd5\u53ef\u4ee5\u7528\u4e8e\u751f\u6210\u6240\u6709\u53ef\u80fd\u7684\u5bc6\u7801\u3002<\/li>\n
    2. \u7ec4\u5408\u6e38\u620f<\/strong>\uff1a\u5982\u5b57\u8c1c\u6e38\u620f\u3001\u89e3\u5bc6\u6e38\u620f\u7b49\u3002<\/li>\n
    3. \u6570\u636e\u5206\u6790<\/strong>\uff1a\u5728\u6570\u636e\u5206\u6790\u4e2d\uff0c\u751f\u6210\u6570\u636e\u7684\u6240\u6709\u6392\u5217\u7ec4\u5408\u53ef\u4ee5\u7528\u4e8e\u7ec4\u5408\u6d4b\u8bd5\u3002<\/li>\n<\/ol>\n
      \u4e94\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
      \u672c\u6587\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u4e09\u79cd\u8ba1\u7b97\u4e09\u4e2a\u5b57\u7b26\u6392\u5217\u7ec4\u5408\u7684\u65b9\u6cd5\uff1a\u4f7f\u7528 itertools<\/code> \u5e93\u3001\u9012\u5f52\u65b9\u6cd5\u548c\u4ea4\u6362\u751f\u6210\u6cd5\u3002\u6bcf\u79cd\u65b9\u6cd5\u90fd\u6709\u5176\u72ec\u7279\u7684\u4f18\u52bf\u548c\u9002\u7528\u573a\u666f\u3002\u5e0c\u671b\u901a\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u4f60\u80fd\u66f4\u597d\u5730\u7406\u89e3\u5e76\u5e94\u7528\u8fd9\u4e9b\u65b9\u6cd5\u6765\u89e3\u51b3\u5b9e\u9645\u95ee\u9898\u3002\u65e0\u8bba\u662f\u7b80\u5355\u7684\u5b57\u7b26\u6392\u5217\uff0c\u8fd8\u662f\u590d\u6742\u7684\u6570\u636e\u7ec4\u5408\uff0c\u8fd9\u4e9b\u65b9\u6cd5\u90fd\u80fd\u4e3a\u4f60\u63d0\u4f9b\u6709\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n<\/p>\n
      \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
       \u5982\u4f55\u4f7f\u7528Python\u8ba1\u7b97\u4e09\u4e2a\u5b57\u7b26\u7684\u6392\u5217\u7ec4\u5408\uff1f<\/strong>
      \u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528itertools<\/code>\u6a21\u5757\u4e2d\u7684permutations<\/code>\u548ccombinations<\/code>\u51fd\u6570\u6765\u8ba1\u7b97\u5b57\u7b26\u7684\u6392\u5217\u548c\u7ec4\u5408\u3002permutations<\/code>\u7528\u4e8e\u8ba1\u7b97\u6392\u5217\uff0c\u800ccombinations<\/code>\u5219\u7528\u4e8e\u8ba1\u7b97\u7ec4\u5408\u3002\u5177\u4f53\u4ee3\u7801\u793a\u4f8b\u5982\u4e0b\uff1a<\/p>\n
      import itertools\n\ncharacters = 'abc'\npermutations = list(itertools.permutations(characters, 3))\ncombinations = list(itertools.combinations(characters, 3))\n\nprint("\u6392\u5217:", permutations)\nprint("\u7ec4\u5408:", combinations)\n<\/code><\/pre>\n
      \u8fd9\u6837\u5c31\u53ef\u4ee5\u5f97\u5230\u6240\u6709\u53ef\u80fd\u7684\u5b57\u7b26\u6392\u5217\u548c\u7ec4\u5408\u3002<\/p>\n
      \u6392\u5217\u548c\u7ec4\u5408\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong>
      \u6392\u5217\u662f\u8003\u8651\u987a\u5e8f\u7684\uff0c\u800c\u7ec4\u5408\u5219\u4e0d\u8003\u8651\u987a\u5e8f\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5982\u679c\u5b57\u7b26\u662f'a', 'b', 'c'\uff0c\u90a3\u4e48\u6392\u5217\u4f1a\u751f\u6210'a', 'b', 'c'\u548c'b', 'a', 'c'\u7b49\u4e0d\u540c\u7684\u7ed3\u679c\uff0c\u800c\u7ec4\u5408\u5219\u53ea\u4f1a\u5c06'a', 'b', 'c'\u89c6\u4e3a\u4e00\u4e2a\u7ec4\u5408\uff0c\u4e0d\u8bba\u987a\u5e8f\u5982\u4f55\u3002\u56e0\u6b64\uff0c\u5728\u8ba1\u7b97\u65f6\u8981\u660e\u786e\u9700\u6c42\uff0c\u4ee5\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u3002<\/p>\n
      \u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u6392\u5217\u7ec4\u5408\u7684\u8ba1\u7b97\u6709\u54ea\u4e9b\u5e38\u89c1\u573a\u666f\uff1f<\/strong>
      \u6392\u5217\u7ec4\u5408\u7684\u8ba1\u7b97\u5728\u5f88\u591a\u9886\u57df\u90fd\u975e\u5e38\u91cd\u8981\uff0c\u4f8b\u5982\u5728\u5bc6\u7801\u5b66\u4e2d\u751f\u6210\u5bc6\u7801\u7ec4\u5408\uff0c\u6216\u8005\u5728\u7edf\u8ba1\u5206\u6790\u4e2d\u9009\u62e9\u6837\u672c\u3002\u5728\u6e38\u620f\u5f00\u53d1\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u8ba1\u7b97\u4e0d\u540c\u89d2\u8272\u7684\u6392\u5217\u7ec4\u5408\u4ee5\u8bbe\u8ba1\u5173\u5361\u3002\u6b64\u5916\uff0c\u6570\u636e\u5206\u6790\u548c\u673a\u5668\u5b66\u4e60<\/a>\u4e2d\u4e5f\u5e38\u5e38\u9700\u8981\u5229\u7528\u6392\u5217\u7ec4\u5408\u6765\u4f18\u5316\u6a21\u578b\u548c\u7b97\u6cd5\u3002\u56e0\u6b64\uff0c\u638c\u63e1\u8fd9\u4e9b\u57fa\u672c\u8ba1\u7b97\u65b9\u6cd5\u5bf9\u4e8e\u5f88\u591a\u884c\u4e1a\u90fd\u5177\u6709\u5b9e\u9645\u610f\u4e49\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"Python \u8ba1\u7b97\u4e09\u4e2a\u5b57\u7b26\u7684\u6392\u5217\u7ec4\u5408\u7684\u65b9\u6cd5\u6709\uff1a\u4f7f\u7528 itertools \u5e93\u3001\u901a\u8fc7\u9012\u5f52\u5b9e\u73b0\u3001\u5229\u7528\u4ea4\u6362\u751f\u6210\u6cd5\u3002\u672c\u6587 […]","protected":false},"author":3,"featured_media":1144697,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1144692"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1144692"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1144692\/revisions"}],"predecessor-version":[{"id":1144700,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1144692\/revisions\/1144700"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1144697"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1144692"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1144692"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1144692"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}