{"id":76137,"date":"2026-02-14T07:26:16","date_gmt":"2026-02-13T23:26:16","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/76137.html"},"modified":"2026-02-14T07:26:16","modified_gmt":"2026-02-13T23:26:16","slug":"python-%e6%83%b0%e6%80%a7%e6%b1%82%e5%80%bc%e5%ae%9e%e6%88%98%ef%bc%9a%e7%94%a8-itertools-%e9%a9%be%e9%a9%ad%e6%97%a0%e9%99%90%e5%8f%af%e8%83%bd","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/76137.html","title":{"rendered":"Python \u60f0\u6027\u6c42\u503c\u5b9e\u6218\uff1a\u7528 itertools \u9a7e\u9a6d\u65e0\u9650\u53ef\u80fd"},"content":{"rendered":"

Python \u60f0\u6027\u6c42\u503c\u5b9e\u6218：\u7528 itertools \u9a7e\u9a6d\u65e0\u9650\u53ef\u80fd<\/h2>\n

\u5f15\u8a00：\u5f53\u6211\u7b2c\u4e00\u6b21\u9047\u89c1"\u65e0\u9650"<\/h3>\n

\u4e09\u5e74\u524d，\u6211\u5728\u5904\u7406\u4e00\u4e2a\u65e5\u5fd7\u5206\u6790\u9879\u76ee\u65f6\u9047\u5230\u4e86\u68d8\u624b\u7684\u95ee\u9898\u3002\u670d\u52a1\u5668\u6bcf\u5929\u4ea7\u751f\u6570 GB \u7684\u65e5\u5fd7\u6587\u4ef6，\u6211\u9700\u8981\u4ece\u4e2d\u63d0\u53d6\u7279\u5b9a\u6a21\u5f0f\u7684\u524d 100 \u6761\u8bb0\u5f55\u3002\u6700\u521d\u7684\u65b9\u6848\u662f\u5c06\u6574\u4e2a\u6587\u4ef6\u52a0\u8f7d\u5230\u5185\u5b58，\u7136\u540e\u7b5b\u9009\u2014\u2014\u7ed3\u679c\u53ef\u60f3\u800c\u77e5，\u7a0b\u5e8f\u56e0\u5185\u5b58\u6ea2\u51fa\u800c\u5d29\u6e83\u3002<\/p>\n

\u90a3\u6b21\u7ecf\u5386\u8ba9\u6211\u771f\u6b63\u7406\u89e3\u4e86\u60f0\u6027\u6c42\u503c（Lazy Evaluation）\u7684\u5a01\u529b\u3002Python \u901a\u8fc7\u751f\u6210\u5668\u548c itertools \u6a21\u5757，\u8ba9\u6211\u4eec\u80fd\u591f\u4f18\u96c5\u5730\u5904\u7406"\u65e0\u9650"\u6570\u636e\u6d41，\u53ea\u5728\u9700\u8981\u65f6\u624d\u8ba1\u7b97\u503c，\u800c\u4e0d\u662f\u4e00\u6b21\u6027\u52a0\u8f7d\u6240\u6709\u6570\u636e\u3002\u4eca\u5929，\u6211\u5c06\u5e26\u4f60\u6df1\u5165\u63a2\u7d22\u8fd9\u4e00\u5f3a\u5927\u7684\u7f16\u7a0b\u8303\u5f0f，\u4ece\u7406\u8bba\u5230\u5b9e\u6218，\u4ece\u6742\u5e94\u7528\u3002<\/p>\n

\u4e00\u3001\u60f0\u6027\u6c42\u503c：\u6982\u5ff5\u4e0e\u54f2\u5b66<\/h3>\n

1.1 \u4ec0\u79cd\u8ba1\u7b97\u7b56\u7565，\u5ef6\u8fdf\u8868\u8fbe\u5f0f\u7684\u8ba1\u7b97\u76f4\u5230\u771f\u6b63\u9700\u8981\u7ed3\u679c\u65f6\u3002\u4e0e\u4e4b\u76f8\u5bf9\u7684\u662f"\u53ca\u65e9\u6c42\u503c"（Eager Evaluation），\u5373\u7acb\u5373\u8ba1\u7b97\u6240\u6709\u503c\u3002<\/h4>\n

\u5bf9\u6bd4\u793a\u4f8b：<\/p>\n

# \u53ca\u65e9\u6c42\u503c（\u5217\u8868\u63a8\u5bfc\u5f0f）- \u7acb\u5373\u8ba1\u7b97\u6240_squares = [x**2 for x in range(1000000)]<\/span>
\nprint<\/span>(<\/span>f"\u53ca\u65e9\u6c42\u503c\u5360\u7528\u5185\u5b58：<\/span>{<\/span>eager_squares.<\/span>__sizeof__(<\/span>)<\/span>}<\/span><\/span> \u5b57\u8282"<\/span><\/span>)<\/span>
\n# \u8f93\u51fa：\u53ca\u65e9\u6c42\u503c\u5360\u7528\u5185\u5b58：8000056 \u5b57\u8282<\/span><\/p>\n

# \u60f0\u6027\u6c42\u503c（\u751f\u6210\u5668\u8868\u8fbe\u5f0f）- \u6309\u9700\u8ba1\u7b97<\/span>
\nlazy_squares =<\/span> (<\/span>x**<\/span>2<\/span> for<\/span> x in<\/span> range<\/span>(<\/span>1000000<\/span>)<\/span>)<\/span>
\nprint<\/span>(<\/span>f"\u60f0\u6027\u6c42\u503c\u5360\u7528\u5185\u5b58：<\/span>{<\/span>lazy_squares.<\/span>__sizeof__(<\/span>)<\/span>}<\/span><\/span> \u5b57\u8282"<\/span><\/span>)<\/span>
\n# \u8f93\u51fa：\u60f0\u6027\u6c42\u503c\u5360\u7528\u5185\u5b58：104 \u5b57\u8282<\/span><\/p>\n

\u8fd9\u4e2a\u7b80\u5355\u7684\u5bf9\u6bd4\u63ed\u793a\u4e86\u60f0\u6027\u6c42\u503c\u7684\u6838\u5fc3\u4f18\u52bf：**\u5185\u6210\u5668\u4e0d\u5b58\u50a8\u6240\u6709\u503c，\u53ea\u8bb0\u5f55\u751f\u6210\u89c4\u5219\u3002<\/p>\n

1.2 \u4e3a\u4ec0\u4e48\u9700\u8981\u60f0\u6027\u6c42\u503c？<\/h4>\n

\u5728\u4ee5\u4e0b\u573a\u666f\u4e2d，\u60f0\u6027\u6c42\u503c\u5c24\u4e3a\u5173\u952e：<\/p>\n

  • \u5904\u7406\u5927\u6570\u636e\u96c6：\u65e0\u6cd5\u4e00\u6b21\u6027\u52a0\u8f7d\u5230\u5185\u5b58<\/li>\n
  • \u65e0\u9650\u5e8f\u5217：\u7406\u8bba\u4e0a\u65e0\u7a77\u7684\u6570\u636e\u6d41（\u5982\u6590\u6ce2\u90a3\u5951\u6570\u5217）<\/li>\n
  • \u6602\u8d35\u7684\u8ba1\u7b97：\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8ba1\u7b97\u5f00\u9500<\/li>\n
  • \u6d41\u5f0f\u5904\u7406：\u5b9e\u65f6\u6570\u636e\u5904\u7406（\u5982\u7f51\u7edc\u6d41\u3001\u4f20\u611f\u5668\u6570\u636e）<\/li>\n

    \u4e8c\u3001itertools：\u60f0\u6027\u6c42\u503c\u7684\u745e\u58eb\u519b\u5200<\/h3>\n

    2.1 \u6a21\u5757\u6982\u89c8<\/h4>\n

    itertools \u662f Python \u6807\u51c6\u5e93\u4e2d\u7684\u8fed\u4ee3\u5668\u5de5\u5177\u6a21\u5757，\u63d0\u4f9b\u4e86\u4e09\u7c7b\u4e3b\u8981\u529f\u80fd：<\/p>\n

      \n
    • \u65e0\u9650\u8fed\u4ee3\u5668：count(), cycle(), repeat()<\/li>\n
    • \u6709\u9650\u8fed\u4ee3\u5668：chain(), compress(), dropwhile() \u7b49<\/li>\n
    • \u7ec4\u5408\u8fed\u4ee3\u5668：product(), permutations(), combinations()<\/li>\n<\/ul>\n

      2.2 \u6838\u5fc3\u5b9e\u6218：\u521b\u5efa\u65e0\u9650\u5e8f\u5217\u5e76\u53d6\u524d 10 \u4e2a\u5143\u7d20<\/h4>\n

      \u6848\u4f8b 1：\u65e0\u9650\u8ba1\u6570\u5668<\/h5>\n

      import<\/span> itertools<\/p>\n

      # \u521b\u5efa\u4ece 1 \u5f00\u59cb\u3001\u6b65\u957f\u4e3a 2 \u7684\u65e0\u9650\u5947\u6570\u5e8f\u5217<\/span>
      \ninfinite_odds =<\/span> itertools.<\/span>count(<\/span>start=<\/span>1<\/span>,<\/span> step=<\/span>2<\/span>)<\/span><\/p>\n

      # \u53ea\u53d6\u524d 10 \u4e2a\u5143\u7d20<\/span>
      \nfirst_10_odds =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>infinite_odds,<\/span> 10<\/span>)<\/span>)<\/span>
      \nprint<\/span>(<\/span>f"\u524d 10 \u4e2a\u5947\u6570：<\/span>{<\/span>first_10_odds}<\/span><\/span>"<\/span><\/span>)<\/span>
      \n# \u8f93\u51fa：\u524d 10 \u4e2a\u5947\u6570：[1, 3, 5, 7, 9, 11, 13, 15, 17, 19]<\/span><\/p>\n

      \u6280\u672f\u89e3\u6790：<\/p>\n

        \n
      • count()：\u751f\u6210\u65e0\u9650\u5e8f\u5217，\u4e0d\u6d88\u8017\u989d\u5916\u5185\u5b58<\/li>\n
      • islice(iterable, stop)：\u60f0\u6027\u5207\u7247，\u53ea\u8fed\u4ee3\u5230\u9700\u8981\u7684\u4f4d\u7f6e<\/li>\n<\/ul>\n
        \u6848\u4f8b 2：\u65e0\u9650\u5faa\u73af\u5e8f\u5217<\/h5>\n

        import<\/span> itertools<\/p>\n

        # \u521b\u5efa\u65e0\u9650\u5faa\u73af\u7684\u84dd'])<\/span><\/p>\n

        # \u53d6\u524d 10 \u4e2a\u989c\u8272<\/span>
        \nfirst_10_colors =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>colors,<\/span> 10<\/span>)<\/span>)<\/span>
        \nprint<\/span>(<\/span>f"\u524d 10 \u4e2a\u989c\u8272：<\/span>{<\/span>first_10_colors}<\/span><\/span>"<\/span><\/span>)<\/span>
        \n# \u8f93\u51fa：\u524d 10 \u4e2a\u989c\u8272：['\u7ea2', '\u7eff', '\u84dd', '\u7ea2', '\u7eff', '\u84dd', '\u7ea2', '\u7eff', '\u84dd', '\u7ea2']<\/span><\/p>\n

        \u5e94\u7528\u573a\u666f：\u8f6e\u8be2\u8c03\u5ea6\u3001UI \u4e3b\u9898\u5207\u6362\u3001\u8d1f\u8f7d\u5747\u8861\u7b49\u3002<\/p>\n

        \u6848\u4f8b 3：\u81ea\u5b9a\u4e49\u65e0\u9650\u5e8f\u5217 – \u6590\u6ce2\u90a3\u5951\u6570\u5217<\/h5>\n

        import<\/span> itertools<\/p>\n

        def<\/span> fibonacci<\/span>(<\/span>)<\/span>:<\/span>
        \n """\u751f\u6210\u65e0\u9650\u6590\u6ce2\u90a3\u5951\u6570\u5217"""<\/span>
        \n a,<\/span> b =<\/span> 0<\/span>,<\/span> 1<\/span>
        \n while<\/span> True<\/span>:<\/span>
        \n yield<\/span> a
        \n a,<\/span> b =<\/span> b,<\/span> a +<\/span> b<\/p>\n

        # \u53d6\u524d 10 \u9879\u6590\u6ce2\u90a3\u5951\u6570<\/span>
        \nfib_sequence =<\/span> fibonacci(<\/span>)<\/span>
        \nfirst_10_fib =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>fib_sequence,<\/span> 10<\/span>)<\/span>)<\/span>
        \nprint<\/span>(<\/span>f"\u524d 10 \u9879\u6590\u6ce2\u90a3\u5951\u6570：<\/span>{<\/span>first_10_fib}<\/span><\/span>"<\/span><\/span>)<\/span>
        \n# \u8f93\u51fa：\u524d 10 \u9879\u6590\u6ce2\u90a3\u5951\u6570：[0, 1, 1, 2, 3, 5, 8, 13, 21, 34]<\/span><\/p>\n

        \u5173\u952e\u6280\u672f：<\/p>\n

          \n
        • yield：\u5c06\u51fd\u6570\u8f6c\u6362\u4e3a\u751f\u6210\u5668<\/li>\n
        • \u751f\u6210\u5668\u60f0\u6027\u8ba1\u7b97，\u53ef\u8868\u793a\u7406\u8bba\u4e0a\u7684\u65e0\u9650\u5e8f\u5217<\/li>\n<\/ul>\n

          \u4e09\u3001\u8fdb\u9636\u6280\u5de7：\u7ec4\u5408 itertools \u5de5\u5177<\/h3>\n

          3.1 \u8fc7\u6ee4\u65e0\u9650\u5e8f\u5217<\/h4>\n

          import<\/span> itertools<\/p>\n

          # \u65e0\u9650\u81ea\u7136\u6570<\/span>
          \nnatural_numbers =<\/span> itertools.<\/span>count(<\/span>1<\/span>)<\/span><\/p>\n

          # \u7b5b\u9009\u80fd\u88ab 3 \u6574\u9664\u7684\u6570<\/span>
          \ndivisible_by_3 =<\/span> filter<\/span>(<\/span>lambda<\/span> x:<\/span> x %<\/span> 3<\/span> ==<\/span> 0<\/span>,<\/span> natural_numbers)<\/span><\/p>\n

          # \u53d6\u524d 10 \u4e2a<\/span>
          \nresult =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>divisible_by_3,<\/span> 10<\/span>)<\/span>)<\/span>
          \nprint<\/span>(<\/span>f"\u524d 10 \u4e2a\u80fd\u88ab 3 \u6574\u9664\u7684\u6570：<\/span>{<\/span>result}<\/span><\/span>"<\/span><\/span>)<\/span>
          \n# \u8f93\u51fa：\u524d 10 \u4e2a\u80fd\u88ab 3 \u6574\u9664\u7684\u6570：[3, 6, 9, 12, 15, 18, 21, 24, 27, 30]<\/span><\/p>\n

          3.2 \u6620\u5c04\u4e0e\u8f6c\u6362<\/h4>\n

          import<\/span> itertools<\/p>\n

          # \u65e0\u9650\u5e8f\u5217：2 \u7684\u5e42\u6b21\u65b9<\/span>
          \npowers_of_2 =<\/span> map<\/span>(<\/span>lambda<\/span> x:<\/span> 2<\/span>**<\/span>x,<\/span> itertools.<\/span>count(<\/span>0<\/span>)<\/span>)<\/span><\/p>\n

          # \u53d6\u524d 10 \u4e2a<\/span>
          \nfirst_10_powers =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>powers_of_2,<\/span> 10<\/span>)<\/span>)<\/span>
          \nprint<\/span>(<\/span>f"2 \u7684\u524d 10 \u4e2a\u5e42\u6b21\u65b9：<\/span>{<\/span>first_10_powers}<\/span><\/span>"<\/span><\/span>)<\/span>
          \n# \u8f93\u51fa：2 \u7684\u524d 10 \u4e2a\u5e42\u6b21\u65b9：[1, 2, 4, 8, 16, 32, 64, 128, 256, 512]<\/span><\/p>\n

          3.3 \u94fe\u6784\u5efa\u590d\u6742\u903b\u8f91<\/h4>\n

          import<\/span> itertools<\/p>\n

          # \u9700\u6c42：\u751f\u6210\u65e0\u9650\u7d20\u6570\u5e8f\u5217\u7684\u524d 10 \u4e2a<\/span><\/p>\n

          def<\/span> is_prime<\/span>(<\/span>n)<\/span>:<\/span>
          \n """\u5224\u65ad\u662f\u5426\u4e3a\u7d20\u6570"""<\/span>
          \n if<\/span> n <<\/span> 2<\/span>:<\/span>
          \n return<\/span> False<\/span>
          \n for<\/span> i in<\/span> range<\/span>(<\/span>2<\/span>,<\/span> int<\/span>(<\/span>n**<\/span>0.5<\/span>)<\/span> +<\/span> 1<\/span>)<\/span>:<\/span>
          \n if<\/span> n %<\/span> i ==<\/span> 0<\/span>:<\/span>
          \n return<\/span> False<\/span>
          \n return<\/span> True<\/span><\/p>\n

          # \u65e0\u9650\u81ea\u7136\u6570 -> \u8fc7\u6ee4\u7d20\u6570 -> \u53d6\u524d 10 \u4e2a<\/span>
          \nprimes =<\/span> filter<\/span>(<\/span>is_prime,<\/span> itertools.<\/span>count(<\/span>2<\/span>)<\/span>)<\/span>
          \nfirst_10_primes =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>primes,<\/span> 10<\/span>)<\/span>)<\/span>
          \nprint<\/span>(<\/span>f"\u524d 10 \u4e2a\u7d20\u6570：<\/span>{<\/span>first_10_primes}<\/span><\/span>"<\/span><\/span>)<\/span>
          \n# \u8f93\u51fa：\u524d 10 \u4e2a\u7d20\u6570：[2, 3, 5, 7, 11, 13, 17, 19, 23, 29]<\/span><\/p>\n

          \u56db\u3001\u5b9e\u6218\u6848\u4f8b：\u771f\u5b9e\u573a\u666f\u5e94\u7528<\/h3>\n

          4.1 \u6848\u4f8b：\u5b9e\u65f6\u65e5\u5fd7\u6d41\u5904\u7406<\/h4>\n

          \u573a\u666f：\u4ece\u6301\u7eed\u751f\u6210\u7684\u65e5\u5fd7\u6d41\u4e2d\u63d0\u53d6\u9519\u8bef\u4fe1\u606f，\u53ea\u5904\u7406\u524d 100 \u6761\u3002<\/p>\n

          import<\/span> itertools
          \nimport<\/span> time
          \nimport<\/span> random<\/p>\n

          def<\/span> log_stream<\/span>(<\/span>)<\/span>:<\/span>
          \n """\u6a21\u62df\u65e0\u9650\u65e5\u5fd7\u6d41"""<\/span>
          \n log_levels =<\/span> [<\/span>'INFO'<\/span>,<\/span> 'WARNING'<\/span>,<\/span> 'ERROR'<\/span>,<\/span> 'DEBUG'<\/span>]<\/span>
          \n counter =<\/span> 0<\/span>
          \n while<\/span> True<\/span>:<\/span>
          \n level =<\/span> random.<\/span>choice(<\/span>log_levels)<\/span>
          \n message =<\/span> f"[<\/span>{<\/span>level}<\/span><\/span>] Log entry #<\/span>{<\/span>counter}<\/span><\/span>"<\/span><\/span>
          \n yield<\/span> {<\/span>'level'<\/span>:<\/span> level,<\/span> 'message'<\/span>:<\/span> message}<\/span>
          \n counter +=<\/span> 1<\/span>
          \n time.<\/span>sleep(<\/span>0.01<\/span>)<\/span> # \u6a21\u62df\u65e5\u5fd7\u751f\u6210\u95f4\u9694<\/span><\/p>\n

          # \u8fc7\u6ee4\u51fa ERROR \u7ea7\u522b\u7684\u65e5\u5fd7<\/span>
          \nlogs =<\/span> log_stream(<\/span>)<\/span>
          \nerror_logs =<\/span> filter<\/span>(<\/span>lambda<\/span> log:<\/span> log[<\/span>'level'<\/span>]<\/span> ==<\/span> 'ERROR'<\/span>,<\/span> logs)<\/span><\/p>\n

          # \u53ea\u5904\u7406\u524d 10 \u6761\u9519\u8bef\u65e5\u5fd7<\/span>
          \nfirst_10_errors =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>error_logs,<\/span> 10<\/span>)<\/span>)<\/span><\/p>\n

          print<\/span>(<\/span>"\u524d 10 \u6761\u9519\u8bef\u65e5\u5fd7："<\/span>)<\/span>
          \nfor<\/span> error in<\/span> first_10_errors:<\/span>
          \n print<\/span>(<\/span>error[<\/span>'message'<\/span>]<\/span>)<\/span><\/p>\n

          \u4f18\u52bf\u5206\u6790：<\/p>\n

            \n
          • \u4e0d\u9700\u8981\u7f13\u5b58\u6240\u6709\u65e5\u5fd7（\u53ef\u80fd\u6570 GB）<\/li>\n
          • \u5b9e\u65f6\u5904\u7406，\u6ee1\u8db3\u6761\u4ef6\u540e\u7acb\u5373\u505c\u6b62<\/li>\n
          • \u5185\u5b58\u5360\u7528\u6052\u5b9a，\u4ec5\u4fdd\u7559\u5f53\u524d\u5904\u7406\u7684\u65e5\u5fd7\u9879<\/li>\n<\/ul>\n

            4.2 \u6848\u4f8b：\u5206\u9875 API \u6570\u636e\u6293\u53d6<\/h4>\n

            \u573a\u666f：\u4ece\u5206\u9875 API \u83b7\u53d6\u6570\u636e，\u4f46\u53ea\u9700\u8981\u524d 50 \u6761\u8bb0\u5f55\u3002<\/p>\n

            import<\/span> itertools<\/p>\n

            def<\/span> fetch_page<\/span>(<\/span>page_num)<\/span>:<\/span>
            \n """\u6a21\u62df\u5206\u9875 API \u8c03\u7528"""<\/span>
            \n # \u5b9e\u9645\u5e94\u7528\u4e2d\u8fd9\u91cc\u662f HTTP \u8bf7\u6c42<\/span>
            \n items_per_page =<\/span> 10<\/span>
            \n start_id =<\/span> page_num *<\/span> items_per_page
            \n return<\/span> [<\/span>{<\/span>'id'<\/span>:<\/span> i,<\/span> 'data'<\/span>:<\/span> f'Item <\/span>{<\/span>i}<\/span><\/span>'<\/span><\/span>}<\/span> for<\/span> i in<\/span> range<\/span>(<\/span>start_id,<\/span> start_id +<\/span> items_per_page)<\/span>]<\/span><\/p>\n

            def<\/span> api_stream<\/span>(<\/span>)<\/span>:<\/span>
            \n """\u65e0\u9650 API \u5206\u9875\u6d41"""<\/span>
            \n page =<\/span> 0<\/span>
            \n while<\/span> True<\/span>:<\/span>
            \n page_data =<\/span> fetch_page(<\/span>page)<\/span>
            \n for<\/span> item in<\/span> page_data:<\/span>
            \n yield<\/span> item
            \n page +=<\/span> 1<\/span><\/p>\n

            # \u53ea\u83b7\u53d6\u524d 50 \u6761\u6570\u636e<\/span>
            \ndata_stream =<\/span> api_stream(<\/span>)<\/span>
            \nfirst_50_items =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>data_stream,<\/span> 50<\/span>)<\/span>)<\/span><\/p>\n

            print<\/span>(<\/span>f"\u83b7\u53d6\u4e86 <\/span>{<\/span>len<\/span>(<\/span>first_50_items)<\/span>}<\/span><\/span> \u6761\u6570\u636e"<\/span><\/span>)<\/span>
            \nprint<\/span>(<\/span>f"\u6700\u540e\u4e00\u6761\u6570\u636e：<\/span>{<\/span>first_50_items[<\/span>–<\/span>1<\/span>]<\/span>}<\/span><\/span>"<\/span><\/span>)<\/span>
            \n# \u8f93\u51fa：\u83b7\u53d6\u4e86 50 \u6761\u6570\u636e<\/span>
            \n# \u8f93\u51fa：\u6700\u540e\u4e00\u6761\u6570\u636e：{'id': 49, 'data': 'Item 49'}<\/span><\/p>\n

            \u6027\u80fd\u4f18\u52bf：<\/p>\n

              \n
            • \u907f\u514d\u8bf7\u6c42\u4e0d\u5fc5\u8981\u7684 API \u9875\u9762<\/li>\n
            • \u8282\u7701\u7f51\u7edc\u5e26\u5bbd\u548c\u670d\u52a1\u5668\u8d44\u6e90<\/li>\n
            • \u4ee3\u7801\u7b80\u6d01，\u903b\u8f91\u6e05\u6670<\/li>\n<\/ul>\n

              4.3 \u6848\u4f8b：\u65e0\u9650\u6570\u636e\u7ba1\u9053<\/h4>\n

              import<\/span> itertools<\/p>\n

              # \u6570\u636e\u6e90：\u65e0\u9650\u4f20\u611f\u5668\u8bfb\u6570<\/span>
              \ndef<\/span> sensor_readings<\/span>(<\/span>)<\/span>:<\/span>
              \n """\u6a21\u62df\u6e29\u5ea6\u4f20\u611f\u5668"""<\/span>
              \n base_temp =<\/span> 20.0<\/span>
              \n counter =<\/span> 0<\/span>
              \n while<\/span> True<\/span>:<\/span>
              \n import<\/span> math
              \n # \u6a21\u62df\u6e29\u5ea6\u6ce2\u52a8（\u6b63\u5f26\u6ce2 + \u566a\u58f0）<\/span>
              \n temp =<\/span> base_temp +<\/span> 5<\/span> *<\/span> math.<\/span>sin(<\/span>counter \/<\/span> 10<\/span>)<\/span> +<\/span> random.<\/span>uniform(<\/span>–<\/span>1<\/span>,<\/span> 1<\/span>)<\/span>
              \n yield<\/span> temp
              \n counter +=<\/span> 1<\/span><\/p>\n

              # \u6570\u636e\u5904\u7406\u7ba1\u9053<\/span>
              \nreadings =<\/span> sensor_readings(<\/span>)<\/span><\/p>\n

              # \u6b65\u9aa4 1：\u8fc7\u6ee4\u5f02\u5e38\u503c（\u6e29\u5ea6 > 25\u00b0C）<\/span>
              \nhigh_temps =<\/span> filter<\/span>(<\/span>lambda<\/span> t:<\/span> t ><\/span> 25<\/span>,<\/span> readings)<\/span><\/p>\n

              # \u6b65\u9aa4 2：\u56db\u820d\u4e94\u5165\u5230\u4e00\u4f4d\u5c0f\u6570<\/span>
              \nrounded_temps =<\/span> map<\/span>(<\/span>lambda<\/span> t:<\/span> round<\/span>(<\/span>t,<\/span> 1<\/span>)<\/span>,<\/span> high_temps)<\/span><\/p>\n

              # \u6b65\u9aa4 3：\u53ea\u53d6\u524d 10 \u4e2a\u9ad8\u6e29\u8bfb\u6570<\/span>
              \nfirst_10_high_temps =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>rounded_temps,<\/span> 10<\/span>)<\/span>)<\/span><\/p>\n

              print<\/span>(<\/span>f"\u524d 10 \u4e2a\u9ad8\u6e29\u8bfb\u6570：<\/span>{<\/span>first_10_high_temps}<\/span><\/span>"<\/span><\/span>)<\/span><\/p>\n

              \u4e94\u3001\u6027\u80fd\u5bf9\u6bd4\u4e0e\u6700\u4f73\u5b9e\u8df5<\/h3>\n

              5.1 \u5185\u5b58\u6548\u7387\u5bf9\u6bd4<\/h4>\n

              import<\/span> itertools
              \nimport<\/span> sys<\/p>\n

              # \u65b9\u6848 A：\u53ca\u65e9\u6c42\u503c – \u5217\u8868<\/span>
              \neager_list =<\/span> list<\/span>(<\/span>range<\/span>(<\/span>1000000<\/span>)<\/span>)<\/span>
              \neager_memory =<\/span> sys.<\/span>getsizeof(<\/span>eager_list)<\/span><\/p>\n

              # \u65b9\u6848 B：\u60f0\u6027\u6c42\u503c – \u751f\u6210\u5668<\/span>
              \nlazy_gen =<\/span> (<\/span>x for<\/span> x in<\/span> range<\/span>(<\/span>1000000<\/span>)<\/span>)<\/span>
              \nlazy_memory =<\/span> sys.<\/span>getsizeof(<\/span>lazy_gen)<\/span><\/p>\n

              print<\/span>(<\/span>f"\u5217\u8868\u5185\u5b58\u5360\u7528：<\/span>{<\/span>eager_memory:<\/span>,<\/span>}<\/span><\/span> \u5b57\u8282"<\/span><\/span>)<\/span>
              \nprint<\/span>(<\/span>f"\u751f\u6210\u5668\u5185\u5b58\u5360\u7528：<\/span>{<\/span>lazy_memory:<\/span>,<\/span>}<\/span><\/span> \u5b57\u8282"<\/span><\/span>)<\/span>
              \nprint<\/span>(<\/span>f"\u5185\u5b58\u8282\u7701：<\/span>{<\/span>(<\/span>eager_memory –<\/span> lazy_memory)<\/span> \/<\/span> eager_memory *<\/span> 100<\/span>:<\/span>.2f<\/span>}<\/span><\/span>%"<\/span><\/span>)<\/span><\/p>\n

              # \u8f93\u51fa：<\/span>
              \n# \u5217\u8868\u5185\u5b58\u5360\u7528：8,000,056 \u5b57\u8282<\/span>
              \n# \u751f\u6210\u5668\u5185\u5b58\u5360\u7528：104 \u5b57\u8282<\/span>
              \n# \u5185\u5b58\u8282\u7701：99.99%<\/span><\/p>\n

              5.2 \u8ba1\u7b97\u6548\u7387\u5bf9\u6bd4<\/h4>\n

              import<\/span> itertools
              \nimport<\/span> time<\/p>\n

              def<\/span> expensive_computation<\/span>(<\/span>n)<\/span>:<\/span>
              \n """\u6a21\u62df\u8017\u65f6\u8ba1\u7b97"""<\/span>
              \n time.<\/span>sleep(<\/span>0.001<\/span>)<\/span>
              \n return<\/span> n **<\/span> 2<\/span><\/p>\n

              # \u53ca\u65e9\u6c42\u503c：\u8ba1\u7b97\u6240\u6709 1000 \u4e2a\u503c<\/span>
              \nstart =<\/span> time.<\/span>time(<\/span>)<\/span>
              \neager_result =<\/span> [<\/span>expensive_computation(<\/span>x)<\/span> for<\/span> x in<\/span> range<\/span>(<\/span>1000<\/span>)<\/span>]<\/span>
              \neager_time =<\/span> time.<\/span>time(<\/span>)<\/span> –<\/span> start<\/p>\n

              # \u60f0\u6027\u6c42\u503c：\u53ea\u8ba1\u7b97\u524d 10 \u4e2a<\/span>
              \nstart =<\/span> time.<\/span>time(<\/span>)<\/span>
              \nlazy_gen =<\/span> (<\/span>expensive_computation(<\/span>x)<\/span> for<\/span> x in<\/span> range<\/span>(<\/span>1000<\/span>)<\/span>)<\/span>
              \nlazy_result =<\/span> list<\/span>(<\/span>itertools.<\/span>islf}<\/span> \u79d2")<\/span>
              \nprint<\/span>(<\/span>f"\u60f0\u6027\u6c42\u503c\u7528\u65f6：<\/span>{<\/span>lazy_time:<\/span>.3f<\/span>}<\/span><\/span> \u79d2"<\/span><\/span>)<\/span>
              \nprint<\/span>(<\/span>f"\u6027\u80fd\u63d0\u5347：<\/span>{<\/span>(<\/span>eager_time \/<\/span> lazy_time)<\/span>:<\/span>.1f<\/span>}<\/span><\/span> \u500d"<\/span><\/span>)<\/span><\/p>\n

              # \u8f93\u51fa：<\/span>
              \n# \u53ca\u65e9\u6c42\u503c\u7528\u65f6：1.015 \u79d2<\/span>
              \n# \u60f0\u6027\u6c42\u503c\u7528\u65f6：0.011 \u79d2<\/span>
              \n# \u6027\u80fd\u63d0\u5347：92.3 \u500d<\/span><\/p>\n

              5.3 \u6700\u4f73\u5b9e\u8df5\u6e05\u5355<\/h4>\n

              \u2705 \u63a8\u8350\u505a\u6cd5：<\/p>\n

              import<\/span> itertools<\/p>\n

              # 1. \u4f7f\u7528 islice \u800c\u975e\u5217\u8868\u5207\u7247<\/span>
              \ngood =<\/span> list<\/span>(<\/span>itertools.<\/span>islice(<\/span>infinite_seq,<\/span> 10<\/span>)<\/span>)<\/span> # \u2705<\/span>
              \n# bad = list(infinite_seq)[:10] # \u274c \u65e0\u6cd5\u5b8c\u6210（\u65e0\u9650\u5faa\u73af）<\/span><\/p>\n

              # 2. \u94fe\u5f0f\u7ec4\u5408\u591a\u4e2a\u60f0\u6027\u64cd\u4f5c<\/span>
              \npipeline =<\/span> itertools.<\/span>islice(<\/span>
              \n map<\/span>(<\/span>str<\/span>.<\/span>upper,<\/span>
              \n filter<\/span>(<\/span>str<\/span>.<\/span>isalpha,<\/span>
              \n itertools.<\/span>count(<\/span>1<\/span>)<\/span>)<\/span>)<\/span>,<\/span>
              \n 10<\/span>
              \n)<\/span> # \u2705 \u6240\u6709\u64cd\u4f5c\u90fd\u662f\u60f0\u6027\u7684<\/span><\/p>\n

              # 3. \u4f7f\u7528\u751f\u6210\u5668\u8868\u8fbe\u5f0f\u800c\u975e\u5217\u8868\u63a8\u5bfc\u5f0f<\/span>
              \nlazy =<\/span> (<\/span>x**<\/span>2<\/span> for<\/span> x in<\/span> range<\/span>(<\/span>1000000<\/span>)<\/span>)<\/span> # \u2705<\/span>
              \n# eager = [x**2 for x in range(1000000)] # \u274c \u5927\u6570\u636e\u96c6\u65f6\u5360\u7528\u5927\u91cf\u5185\u5b58<\/span><\/p>\n

              \u274c \u907f\u514d\u9677\u9631：<\/p>\n

              import<\/span> itertools<\/p>\n

              # \u9677\u9631 1：\u91cd\u590d\u4f7f\u7528\u751f\u6210\u5668<\/span>
              \ngen =<\/span> itertools.<\/span>count(<\/span>1<\/span>)<\/span>
              \nlist<\/span>(<\/span>itertools.<\/span>islice(<\/span>gen,<\/span> 5<\/span>)<\/span>)<\/span> # [1, 2, 3, 4, 5]<\/span>
              \nlist<\/span>(<\/span>itertools.<\/span>islice(<\/span>gen,<\/span> 5<\/span>)<\/span>)<\/span> # [6, 7, 8, 9, 10] \u26a0\ufe0f \u4e0d\u662f\u91cd\u65b0\u5f00\u59cb！<\/span><\/p>\n

              # \u89e3\u51b3\u65b9\u6848：\u6bcf\u6b21\u91cd\u65b0\u521b\u5efa<\/span>
              \ndef<\/span> get_counter<\/span>(<\/span>)<\/span>:<\/span>
              \n return<\/span> itertools.<\/span>count(<\/span>1<\/span>)<\/span><\/p>\n

              # \u9677\u9631 2：\u8fc7\u65e9\u7269\u5316（\u8f6c\u6362\u4e3a\u5217\u8868）<\/span>
              \nbad =<\/span> list<\/span>(<\/span>itertools.<\/span>count(<\/span>1<\/span>)<\/span>)<\/span> # \u274c \u65e0\u9650\u5faa\u73af，\u7a0b\u5e8f\u6302\u8d77<\/span><\/p>\n

              \u516d\u3001\u6269\u5c55\u9605\u8bfb：itertools \u5e38\u7528\u51fd\u6570\u901f\u67e5<\/h3>\n\n\u51fd\u6570\u529f\u80fd\u793a\u4f8b<\/tr>\n\n\n\n\n\n\n\n
              count(start, step)<\/td>\n\u65e0\u9650\u8ba1\u6570<\/td>\ncount(10, 2) \u2192 10, 12, 14\u2026<\/td>\n<\/tr>\n
              cycle(iterable)<\/td>\n\u65e0\u9650\u5faa\u73af<\/td>\ncycle('ABC') \u2192 A, B, C, A\u2026<\/td>\n<\/tr>\n
              repeat(obj, times)<\/td>\n\u91cd\u590d\u5143\u7d20<\/td>\nrepeat(10, 3) \u2192 10, 10, 10<\/td>\n<\/tr>\n
              islice(iter, stop)<\/td>\n\u60f0\u6027\u5207\u7247<\/td>\nislice(count(), 5) \u2192 \u524d 5 \u4e2a<\/td>\n<\/tr>\n
              chain(*iterables)<\/td>\n\u8fde\u63a5\u8fed\u4ee3\u5668<\/td>\nchain([1,2], [3,4]) \u2192 1,2,3,4<\/td>\n<\/tr>\n
              takewhile(pred, iter)<\/td>\n\u6761\u4ef6\u53d6\u503c<\/td>\ntakewhile(lambda x: x<5, count())<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              \u4e03\u3001\u603b\u7ed3\u4e0e\u5c55\u671b<\/h3>\n

              \u6838\u5fc3\u8981\u70b9\u56de\u987e<\/h4>\n
            • \u60f0\u6027\u6c42\u503c = \u6309\u9700\u8ba1\u7b97：\u4e0d\u9884\u5148\u8ba1\u7b97，\u53ea\u5728\u9700\u8981\u65f6\u751f\u6210\u503c<\/li>\n
            • itertools \u662f\u5229\u5668：\u63d0\u4f9b\u4e30\u5bcc\u7684\u65e0\u9650\u5e8f\u5217\u548c\u7ec4\u5408\u5de5\u5177<\/li>\n
            • \u5185\u5b58\u4e0e\u6027\u80fd\u53cc\u8d62：\u5927\u6570\u636e\u5904\u7406\u7684\u4e0d\u4e8c\u9009\u62e9<\/li>\n
            • \u7ba1\u9053\u5f0f\u7f16\u7a0b：\u94fe\u5f0f\u7ec4\u5408\u591a\u4e2a\u60f0\u6027\u64cd\u4f5c，\u4ee3\u7801\u4f18\u96c5\u9ad8\u6548<\/li>\n

              \u5b9e\u8df5\u5efa\u8bae<\/h4>\n

              # \u8bb0\u4f4f\u8fd9\u4e2a\u6a21\u5f0f：\u521b\u5efa -> \u8f6c\u6362 -> \u8fc7\u6ee4 -> \u53d6\u503c<\/span>
              \nimport<\/span> itertools<\/p>\n

              result =<\/span> list<\/span>(<\/span>
              \n itertools.<\/span>islice(<\/span> # 4. \u53d6\u524d N \u4e2a<\/span>
              \n filter<\/span>(<\/span>condition,<\/span> # 3. \u8fc7\u6ee4<\/span>
              \n map<\/span>(<\/span>transform,<\/span> # 2. \u8f6c\u6362<\/span>
              \n infinite_source)<\/span>)<\/span>,<\/span>\u636e\u6e90
              \n N
              \n )<\/span>
              \n)<\/span><\/p>\n

              \u672a\u6765\u63a2\u7d22\u65b9\u5411<\/h4>\n

              \u968f\u7740 Python 3.12+ \u7684\u53d1\u5c55，\u60f0\u6027\u6c42\u503c\u7684\u5e94\u7528\u573a\u666f\u5c06\u66f4\u52a0\u5e7f\u6cdb：<\/p>\n

                \n
              • \u5f02\u6b65\u8fed\u4ee3\u5668（async for）：\u7ed3\u5408 asyncio \u5904\u7406\u5f02\u6b65\u6570\u636e\u6d41<\/li>\n
              • \u6570\u636e\u6d41\u5904\u7406\u6846\u67b6：\u5982 Apache Beam \u7684 Python SDK<\/li>\n
              • \u54cd\u5e94\u5f0f\u7f16\u7a0b：RxPY \u7b49\u5e93\u7684\u60f0\u6027\u6c42\u503c\u5b9e\u73b0<\/li>\n<\/ul>\n

                \u4e92\u52a8\u8ba8\u8bba<\/h3>\n

                \u5728\u4f60\u7684\u9879\u76ee\u4e2d，\u662f\u5426\u9047\u5230\u8fc7\u9700\u8981\u5904\u7406"\u65e0\u9650"\u6216\u8d85\u5927\u6570\u636e\u96c6\u7684\u573a\u666f？\u4f60\u662f\u5982\u4f55\u89e3\u51b3\u7684？\u5bf9\u4e8e\u60f0\u6027\u6c42\u503c，\u4f60\u6709\u54ea\u4e9b\u72ec\u7279\u7684\u5e94\u7528\u7ecf\u9a8c？<\/p>\n

                \u601d\u8003\u9898：<\/p>\n

              • \u5982\u4f55\u7528 itertools \u5b9e\u73b0\u4e00\u4e2a\u65e0\u9650\u7684\u7d20\u6570\u751f\u6210\u5668？<\/li>\n
              • \u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b，\u53ca\u65e9\u6c42\u503c\u6bd4\u60f0\u6027\u6c42\u503c\u66f4\u5408\u9002？<\/li>\n

                \u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u5206\u4eab\u4f60\u7684\u4ee3\u7801\u548c\u60f3\u6cd5，\u8ba9\u6211\u4eec\u4e00\u8d77\u63a2\u7d22 Python \u60f0\u6027\u6c42\u503c\u7684\u65e0\u9650\u53ef\u80fd！<\/p>\n

                \n

                \u53c2\u8003\u8d44\u6e90：<\/p>\n

                  \n
                • Python \u5b98\u65b9\u6587\u6863 – itertools<\/li>\n
                • PEP 289 – Generator Expressions<\/li>\n
                • \u300a\u6d41\u7545\u7684Python\u300b\u7b2c 14 \u7ae0：\u53ef\u8fed\u4ee3\u5bf9\u8c61\u3001\u8fed\u4ee3\u5668\u548c\u751f\u6210\u5668<\/li>\n<\/ul>\n

                  \u8ba9\u6211\u4eec\u7528\u60f0\u6027\u6c42\u503c\u7684\u667a\u6167，\u5199\u51fa\u66f4\u9ad8\u6548\u3001\u66f4\u4f18\u96c5\u7684 Python \u4ee3\u7801！<\/p>\n","protected":false},"excerpt":{"rendered":"

                  Python \u60f0\u6027\u6c42\u503c\u5b9e\u6218：\u7528 itertools \u9a7e\u9a6d\u65e0\u9650\u53ef\u80fd
                  \n\u5f15\u8a00：\u5f53\u6211\u7b2c\u4e00\u6b21\u9047\u89c1\\”\u65e0\u9650\\”
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                  \n\u90a3\u6b21\u7ecf\u5386\u8ba9\u6211\u771f\u6b63\u7406\u89e3\u4e86\u60f0\u6027\u6c42\u503c（Lazy Evaluation&<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[99,58,81],"topic":[],"class_list":["post-76137","post","type-post","status-publish","format-standard","hentry","category-server","tag-java","tag-linux","tag-python"],"yoast_head":"\nPython \u60f0\u6027\u6c42\u503c\u5b9e\u6218\uff1a\u7528 itertools \u9a7e\u9a6d\u65e0\u9650\u53ef\u80fd - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/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:\/\/www.wsisp.com\/helps\/76137.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python \u60f0\u6027\u6c42\u503c\u5b9e\u6218\uff1a\u7528 itertools \u9a7e\u9a6d\u65e0\u9650\u53ef\u80fd - 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