{"id":979142,"date":"2024-12-27T06:43:57","date_gmt":"2024-12-26T22:43:57","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/979142.html"},"modified":"2024-12-27T06:43:59","modified_gmt":"2024-12-26T22:43:59","slug":"python%e5%a6%82%e4%bd%95%e9%81%8d%e5%8e%86list%e6%9c%80%e5%bf%ab","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/979142.html","title":{"rendered":"python\u5982\u4f55\u904d\u5386list\u6700\u5feb"},"content":{"rendered":"

\"python\u5982\u4f55\u904d\u5386list\u6700\u5feb\"<\/p>\n

\u5728Python\u4e2d\uff0c\u904d\u5386list\u6700\u5feb\u7684\u65b9\u6cd5\u901a\u5e38\u662f\u4f7f\u7528for\u5faa\u73af\u3001\u5217\u8868\u63a8\u5bfc\u5f0f\u3001enumerate\u51fd\u6570\u3002\u4f7f\u7528for\u5faa\u73af\u662f\u6700\u5e38\u7528\u548c\u76f4\u89c2\u7684\u65b9\u6cd5\uff1b\u5217\u8868\u63a8\u5bfc\u5f0f\u5728\u9700\u8981\u751f\u6210\u65b0\u5217\u8868\u65f6\u6548\u7387\u9ad8\uff1benumerate\u51fd\u6570\u5728\u9700\u8981\u5143\u7d20\u7d22\u5f15\u65f6\u975e\u5e38\u6709\u7528\u3002<\/strong>\u5176\u4e2d\uff0cfor\u5faa\u73af\u662f\u6700\u57fa\u7840\u7684\u904d\u5386\u65b9\u6cd5\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5217\u8868\u63a8\u5bfc\u5f0f\u53ef\u4ee5\u63d0\u4f9b\u66f4\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u8fd9\u51e0\u79cd\u65b9\u6cd5\u53ca\u5176\u4f18\u7f3a\u70b9\u3002<\/p>\n<\/p>\n

\u4e00\u3001FOR\u5faa\u73af<\/p>\n<\/p>\n

For\u5faa\u73af\u662f\u904d\u5386\u5217\u8868\u7684\u7ecf\u5178\u65b9\u6cd5\u3002\u5b83\u7b80\u5355\u3001\u76f4\u89c2\uff0c\u5e76\u4e14\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u6027\u80fd\u8868\u73b0\u826f\u597d\u3002<\/p>\n<\/p>\n

    \n
  1. \n

    \u57fa\u7840\u4f7f\u7528<\/strong><\/p>\n

    For\u5faa\u73af\u5141\u8bb8\u6211\u4eec\u76f4\u63a5\u8bbf\u95ee\u5217\u8868\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\uff0c\u65e0\u9700\u989d\u5916\u7684\u7d22\u5f15\u64cd\u4f5c\u3002\u5176\u8bed\u6cd5\u7b80\u5355\uff0c\u6613\u4e8e\u7406\u89e3\uff0c\u975e\u5e38\u9002\u5408\u521d\u5b66\u8005\u3002<\/p>\n<\/p>\n

    my_list = [1, 2, 3, 4, 5]<\/p>\n
    for item in my_list:<\/p>\n
        print(item)<\/p>\n
    <\/code><\/pre>\n<\/p>\n<\/li>\n
  2. \n
    \u6548\u7387\u4e0e\u6027\u80fd<\/strong><\/p>\n
    \u867d\u7136for\u5faa\u73af\u4e0d\u662f\u6700\u5feb\u7684\uff0c\u4f46\u5b83\u7684\u6027\u80fd\u901a\u5e38\u8db3\u4ee5\u6ee1\u8db3\u5927\u591a\u6570\u9700\u6c42\u3002\u5bf9\u4e8e\u975e\u5e38\u5927\u7684\u5217\u8868\uff0cfor\u5faa\u73af\u53ef\u80fd\u4f1a\u663e\u5f97\u7a0d\u6162\uff0c\u56e0\u6b64\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\u53ef\u4ee5\u8003\u8651\u5176\u4ed6\u66f4\u9ad8\u6548\u7684\u65b9\u6cd5\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
    \u4e8c\u3001\u5217\u8868\u63a8\u5bfc\u5f0f<\/p>\n<\/p>\n
    \u5217\u8868\u63a8\u5bfc\u5f0f\u662f\u4e00\u79cd\u7b80\u6d01\u7684\u8bed\u6cd5\uff0c\u53ef\u4ee5\u5728\u4e00\u884c\u5185\u751f\u6210\u4e00\u4e2a\u65b0\u5217\u8868\u3002\u5b83\u5728\u5904\u7406\u7b80\u5355\u7684\u5faa\u73af\u548c\u6620\u5c04\u4efb\u52a1\u65f6\u975e\u5e38\u9ad8\u6548\u3002<\/p>\n<\/p>\n
      \n
    1. \n
      \u521b\u5efa\u65b0\u5217\u8868<\/strong><\/p>\n
      \u5f53\u4f60\u9700\u8981\u57fa\u4e8e\u539f\u6709\u5217\u8868\u751f\u6210\u4e00\u4e2a\u65b0\u5217\u8868\u65f6\uff0c\u5217\u8868\u63a8\u5bfc\u5f0f\u662f\u4e00\u4e2a\u6781\u4e3a\u9ad8\u6548\u7684\u9009\u62e9\u3002\u5b83\u4e0d\u4ec5\u7b80\u5316\u4e86\u4ee3\u7801\uff0c\u8fd8\u63d0\u9ad8\u4e86\u6027\u80fd\u3002<\/p>\n<\/p>\n
      my_list = [1, 2, 3, 4, 5]<\/p>\n
      new_list = [item * 2 for item in my_list]<\/p>\n
      print(new_list)<\/p>\n
      <\/code><\/pre>\n<\/p>\n<\/li>\n
    2. \n
      \u6027\u80fd\u4f18\u52bf<\/strong><\/p>\n
      \u5217\u8868\u63a8\u5bfc\u5f0f\u5728\u6027\u80fd\u4e0a\u901a\u5e38\u4f18\u4e8e\u4f20\u7edffor\u5faa\u73af\uff0c\u56e0\u4e3a\u5b83\u5728\u5e95\u5c42\u8fdb\u884c\u4e86\u4f18\u5316\uff0c\u51cf\u5c11\u4e86\u5faa\u73af\u8fc7\u7a0b\u4e2d\u4e0d\u5fc5\u8981\u7684\u64cd\u4f5c\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
      \u4e09\u3001ENUMERATE\u51fd\u6570<\/p>\n<\/p>\n
      Enumerate\u51fd\u6570\u5728\u904d\u5386\u5217\u8868\u7684\u540c\u65f6\u63d0\u4f9b\u5143\u7d20\u7684\u7d22\u5f15\uff0c\u9002\u5408\u5728\u9700\u8981\u8bbf\u95ee\u5143\u7d20\u4f4d\u7f6e\u7684\u573a\u5408\u4f7f\u7528\u3002<\/p>\n<\/p>\n
        \n
      1. \n
        \u4f7f\u7528\u65b9\u6cd5<\/strong><\/p>\n
        Enumerate\u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u8fed\u4ee3\u5bf9\u8c61\uff0c\u4ea7\u751f\u4e00\u5bf9\u5305\u62ec\u7d22\u5f15\u548c\u5143\u7d20\u7684\u5143\u7ec4\u3002\u8fd9\u6837\u53ef\u4ee5\u5728\u904d\u5386\u7684\u540c\u65f6\u65b9\u4fbf\u5730\u83b7\u53d6\u5143\u7d20\u7684\u7d22\u5f15\u3002<\/p>\n<\/p>\n
        my_list = ['a', 'b', 'c']<\/p>\n
        for index, value in enumerate(my_list):<\/p>\n
            print(index, value)<\/p>\n
        <\/code><\/pre>\n<\/p>\n<\/li>\n
      2. \n
        \u4f18\u52bf<\/strong><\/p>\n
        \u4f7f\u7528enumerate\u907f\u514d\u4e86\u624b\u52a8\u7ba1\u7406\u7d22\u5f15\u7684\u9ebb\u70e6\uff0c\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u548c\u53ef\u8bfb\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
        \u56db\u3001ITERTOOLS\u5e93<\/p>\n<\/p>\n
        Itertools\u5e93\u63d0\u4f9b\u4e86\u591a\u79cd\u9ad8\u6548\u7684\u8fed\u4ee3\u5de5\u5177\uff0c\u53ef\u4ee5\u5728\u590d\u6742\u7684\u8fed\u4ee3\u4efb\u52a1\u4e2d\u63d0\u4f9b\u5e2e\u52a9\u3002<\/p>\n<\/p>\n
          \n
        1. \n
          CHAI<\/a>N\u51fd\u6570<\/strong><\/p>\n
          Chain\u51fd\u6570\u53ef\u4ee5\u5c06\u591a\u4e2a\u5217\u8868\u6216\u8fed\u4ee3\u5668\u4e32\u8054\u8d77\u6765\u8fdb\u884c\u904d\u5386\uff0c\u907f\u514d\u4e86\u591a\u91cd\u5faa\u73af\u7684\u590d\u6742\u6027\u3002<\/p>\n<\/p>\n
          import itertools<\/p>\n
          list1 = [1, 2, 3]<\/p>\n
          list2 = [4, 5, 6]<\/p>\n
          for item in itertools.chain(list1, list2):<\/p>\n
              print(item)<\/p>\n
          <\/code><\/pre>\n<\/p>\n<\/li>\n
        2. \n
          \u5176\u4ed6\u5de5\u5177<\/strong><\/p>\n
          Itertools\u8fd8\u63d0\u4f9b\u4e86\u5176\u4ed6\u6709\u7528\u7684\u5de5\u5177\uff0c\u6bd4\u5982islice\u3001cycle\u7b49\uff0c\u5b83\u4eec\u53ef\u4ee5\u5728\u7279\u5b9a\u7684\u573a\u666f\u4e0b\u63d0\u9ad8\u904d\u5386\u6548\u7387\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
          \u4e94\u3001NUMPY\u5e93<\/p>\n<\/p>\n
          \u5bf9\u4e8e\u6570\u503c\u578b\u5217\u8868\uff0cNumPy\u5e93\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u904d\u5386\u7684\u6548\u7387\u3002NumPy\u7684\u6570\u7ec4\u64cd\u4f5c\u5728\u5e95\u5c42\u8fdb\u884c\u4e86\u4f18\u5316\uff0c\u9002\u5408\u5927\u89c4\u6a21\u6570\u503c\u8ba1\u7b97\u3002<\/p>\n<\/p>\n
            \n
          1. \n
            \u6570\u7ec4\u64cd\u4f5c<\/strong><\/p>\n
            NumPy\u63d0\u4f9b\u7684\u6570\u7ec4\u64cd\u4f5c\u51fd\u6570\u53ef\u4ee5\u5728\u4e00\u884c\u4ee3\u7801\u4e2d\u5b8c\u6210\u590d\u6742\u7684\u8ba1\u7b97\u4efb\u52a1\uff0c\u907f\u514d\u4e86for\u5faa\u73af\u7684\u5f00\u9500\u3002<\/p>\n<\/p>\n
            import numpy as np<\/p>\n
            my_array = np.array([1, 2, 3, 4, 5])<\/p>\n
            print(my_array * 2)<\/p>\n
            <\/code><\/pre>\n<\/p>\n<\/li>\n
          2. \n
            \u6027\u80fd\u8868\u73b0<\/strong><\/p>\n
            \u5728\u5904\u7406\u5927\u89c4\u6a21\u6570\u503c\u6570\u636e\u65f6\uff0cNumPy\u7684\u6548\u7387\u4f18\u52bf\u975e\u5e38\u660e\u663e\uff0c\u662f\u79d1\u5b66\u8ba1\u7b97\u548c\u6570\u636e\u5206\u6790\u7684\u9996\u9009\u5de5\u5177\u3002<\/p>\n<\/p>\n<\/li>\n<\/ol>\n
            \u516d\u3001\u7ed3\u8bba<\/p>\n<\/p>\n
            \u904d\u5386list\u7684\u6548\u7387\u53d6\u51b3\u4e8e\u5177\u4f53\u7684\u4f7f\u7528\u573a\u666f\u548c\u9700\u6c42\u3002\u5728\u4e00\u822c\u60c5\u51b5\u4e0b\uff0cfor\u5faa\u73af\u8db3\u4ee5\u80dc\u4efb\u4efb\u52a1\uff0c\u4f46\u5728\u9700\u8981\u751f\u6210\u65b0\u5217\u8868\u6216\u5904\u7406\u590d\u6742\u8fed\u4ee3\u4efb\u52a1\u65f6\uff0c\u5217\u8868\u63a8\u5bfc\u5f0f\u548citertools\u5e93\u53ef\u4ee5\u63d0\u4f9b\u66f4\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002\u800c\u5bf9\u4e8e\u6570\u503c\u578b\u6570\u636e\uff0cNumPy\u5e93\u7684\u6027\u80fd\u4f18\u52bf\u65e0\u53ef\u66ff\u4ee3\u3002\u6839\u636e\u5177\u4f53\u9700\u6c42\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u5728\u4fdd\u8bc1\u4ee3\u7801\u7b80\u6d01\u6027\u7684\u540c\u65f6\uff0c\u83b7\u5f97\u6700\u4f73\u7684\u6027\u80fd\u8868\u73b0\u3002<\/p>\n<\/p>\n
            \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
             \u5982\u4f55\u5728Python\u4e2d\u63d0\u9ad8\u904d\u5386\u5217\u8868\u7684\u901f\u5ea6\uff1f<\/strong>
            \u5728Python\u4e2d\uff0c\u904d\u5386\u5217\u8868\u7684\u901f\u5ea6\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u63d0\u5347\u3002\u4f7f\u7528\u5217\u8868\u63a8\u5bfc\u5f0f\u6216\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u6765\u66ff\u4ee3\u4f20\u7edf\u7684for\u5faa\u73af\uff0c\u901a\u5e38\u80fd\u663e\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u6b64\u5916\uff0c\u8003\u8651\u4f7f\u7528NumPy\u5e93\uff0c\u5b83\u4e13\u4e3a\u5904\u7406\u5927\u89c4\u6a21\u6570\u636e\u800c\u8bbe\u8ba1\uff0c\u80fd\u591f\u66f4\u5feb\u5730\u6267\u884c\u6570\u7ec4\u64cd\u4f5c\u3002\u901a\u8fc7\u9002\u5f53\u9009\u62e9\u6570\u636e\u7ed3\u6784\uff0c\u5982\u96c6\u5408\uff08set\uff09\u6216\u5b57\u5178\uff08dict\uff09\uff0c\u4e5f\u53ef\u4ee5\u63d0\u9ad8\u67e5\u627e\u548c\u904d\u5386\u7684\u6548\u7387\u3002<\/p>\n
            \u5728\u904d\u5386\u5217\u8868\u65f6\uff0c\u4f7f\u7528\u54ea\u4e9b\u5185\u7f6e\u51fd\u6570\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\uff1f<\/strong>
            Python\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5185\u7f6e\u51fd\u6570\uff0c\u5982map()<\/code>\u548cfilter()<\/code>\uff0c\u5b83\u4eec\u53ef\u4ee5\u5728\u904d\u5386\u5217\u8868\u65f6\u663e\u8457\u51cf\u5c11\u4ee3\u7801\u7684\u884c\u6570\uff0c\u5e76\u63d0\u9ad8\u6267\u884c\u901f\u5ea6\u3002\u8fd9\u4e9b\u51fd\u6570\u662f\u7528C\u8bed\u8a00\u5b9e\u73b0\u7684\uff0c\u56e0\u6b64\u5728\u5904\u7406\u5927\u6570\u636e\u65f6\uff0c\u5b83\u4eec\u7684\u6027\u80fd\u901a\u5e38\u4f18\u4e8ePython\u7684for\u5faa\u73af\u3002\u540c\u65f6\uff0c\u4f7f\u7528\u5185\u7f6e\u7684sum()<\/code>\u3001min()<\/code>\u548cmax()<\/code>\u7b49\u51fd\u6570\u6765\u5904\u7406\u5217\u8868\u4e5f\u80fd\u63d0\u5347\u6548\u7387\u3002<\/p>\n
            \u5728\u904d\u5386\u5927\u578b\u5217\u8868\u65f6\uff0c\u6709\u54ea\u4e9b\u4f18\u5316\u6280\u5de7\u53ef\u4ee5\u4f7f\u7528\uff1f<\/strong>
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