{"id":54400,"date":"2023-09-19T12:00:03","date_gmt":"2023-09-19T04:00:03","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=54400"},"modified":"2023-09-19T12:00:06","modified_gmt":"2023-09-19T04:00:06","slug":"python-%e4%b8%ad-iterator-%e5%92%8c-iterable-%e7%9a%84%e5%8c%ba%e5%88%ab%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/54400.html","title":{"rendered":"Python \u4e2d iterator \u548c iterable \u7684\u533a\u522b\u662f\u4ec0\u4e48"},"content":{"rendered":"\n
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\u5728Python\u7f16\u7a0b\u4e2d\uff0citerator<\/code>\u548citerable<\/code>\u662f\u4e24\u4e2a\u7ecf\u5e38\u88ab\u63d0\u53ca\u7684\u6982\u5ff5\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5e8f\u5217\u548c\u96c6\u5408\u6570\u636e\u7ed3\u6784\u65f6\u3002\u5b83\u4eec\u4e4b\u95f4\u7684\u4e3b\u8981\u533a\u522b\u5305\u62ec\uff1a1\u3001\u5b9a\u4e49\u4e0d\u540c\uff1b2\u3001\u529f\u80fd\u6027\u4e0d\u540c\uff1b3\u3001\u4f7f\u7528\u65b9\u6cd5\u4e0d\u540c\uff1b4\u3001__iter__<\/code>\u4e0e__next__<\/code>\u65b9\u6cd5\u7684\u5e94\u7528\uff1b5\u3001\u5185\u5b58\u4f7f\u7528\u5dee\u5f02\u3002\u5176\u4e2d\u6700\u6838\u5fc3\u7684\u533a\u522b\u5728\u4e8e\uff0citerable<\/code>\u662f\u4e00\u4e2a\u53ef\u4ee5\u8fed\u4ee3\u7684\u5bf9\u8c61\uff0c\u800citerator<\/code>\u662f\u6267\u884c\u8fed\u4ee3\u7684\u5de5\u5177\u3002<\/p>\n<\/blockquote>\n\n\n

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\"\"<\/figure><\/div>\n\n\n

1\u3001\u5b9a\u4e49\u4e0d\u540c<\/h2>\n\n\n\n

iterable<\/code>\u662f\u4efb\u4f55\u53ef\u4ee5\u88ab\u8fed\u4ee3\u7684\u5bf9\u8c61\uff0c\u5728Python\u4e2d\uff0c\u5982list\u3001tuple\u3001string\u7b49\u3002\u800citerator<\/code>\u662f\u5b9e\u73b0\u4e86\u8fed\u4ee3\u5668\u534f\u8bae\u7684\u5bf9\u8c61\uff0c\u5305\u62ec__iter__()<\/code>\u548c__next__()<\/code>\u65b9\u6cd5\u3002<\/p>\n\n\n\n

2\u3001\u529f\u80fd\u6027\u4e0d\u540c<\/h2>\n\n\n\n

iterable<\/code>\u5bf9\u8c61\u5b9a\u4e49\u4e86\u8fed\u4ee3\u7684\u6570\u636e\u96c6\uff0c\u4f46\u5e76\u4e0d\u6267\u884c\u8fed\u4ee3\u3002\u800citerator<\/code>\u5bf9\u8c61\u5219\u8d1f\u8d23\u8bb0\u4f4f\u904d\u5386\u7684\u4f4d\u7f6e\u5e76\u6309\u9700\u4ea7\u751f\u4e0b\u4e00\u4e2a\u503c\u3002<\/p>\n\n\n\n

3\u3001\u4f7f\u7528\u65b9\u6cd5\u4e0d\u540c<\/h2>\n\n\n\n

\u4f7f\u7528iter()<\/code>\u51fd\u6570\u53ef\u4ee5\u4eceiterable<\/code>\u5bf9\u8c61\u83b7\u53d6\u4e00\u4e2aiterator<\/code>\u5bf9\u8c61\u3002\u800c\u901a\u8fc7next()<\/code>\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u4eceiterator<\/code>\u83b7\u53d6\u4e0b\u4e00\u4e2a\u9879\u76ee\u3002<\/p>\n\n\n\n

4\u3001__iter__<\/code>\u4e0e__next__<\/code>\u65b9\u6cd5\u7684\u5e94\u7528<\/h2>\n\n\n\n

\u6240\u6709\u7684iterable<\/code>\u90fd\u6709\u4e00\u4e2a__iter__<\/code>\u65b9\u6cd5\u6765\u83b7\u53d6iterator<\/code>\u3002\u4f46\u662f\u53ea\u6709iterator<\/code>\u5bf9\u8c61\u4f1a\u6709__next__<\/code>\u65b9\u6cd5\u6765\u83b7\u53d6\u4e0b\u4e00\u4e2a\u503c\u3002\u5f53\u6240\u6709\u503c\u90fd\u88ab\u53d6\u51fa\u540e\uff0c__next__<\/code>\u65b9\u6cd5\u4f1a\u629b\u51faStopIteration<\/code>\u5f02\u5e38\u3002<\/p>\n\n\n\n

5\u3001\u5185\u5b58\u4f7f\u7528\u5dee\u5f02<\/h2>\n\n\n\n

\u7531\u4e8eiterable<\/code>\u901a\u5e38\u6301\u6709\u6240\u6709\u7684\u6570\u636e\u9879\uff0c\u5b83\u4eec\u53ef\u80fd\u4f1a\u5360\u7528\u5927\u91cf\u5185\u5b58\uff0c\u7279\u522b\u662f\u5f53\u6570\u636e\u96c6\u5f88\u5927\u65f6\u3002iterator<\/code>\u5219\u662f\u201c\u60f0\u6027\u201d\u7684\uff0c\u5b83\u53ea\u5728\u88ab\u8bf7\u6c42\u65f6\u751f\u6210\u4e0b\u4e00\u4e2a\u503c\uff0c\u56e0\u6b64\u5185\u5b58\u4f7f\u7528\u66f4\u4e3a\u9ad8\u6548\u3002<\/p>\n\n\n\n

6\u3001\u8fed\u4ee3\u7684\u6838\u5fc3\u6982\u5ff5<\/h2>\n\n\n\n

\u5728\u6df1\u5165\u4e86\u89e3iterator<\/code>\u548citerable<\/code>\u7684\u5dee\u5f02\u4e4b\u524d\uff0c\u9996\u5148\u8981\u7406\u89e3Python\u4e2d\u7684\u8fed\u4ee3\u3002\u8fed\u4ee3\u662f\u91cd\u590d\u63d0\u4f9b\u6570\u636e\u96c6\u4e2d\u7684\u9879\u76ee\u7684\u8fc7\u7a0b\uff0c\u76f4\u5230\u6240\u6709\u9879\u76ee\u90fd\u88ab\u5904\u7406\u3002<\/p>\n\n\n\n

7\u3001\u5b9e\u9645\u5e94\u7528<\/h2>\n\n\n\n

\u5728\u5b9e\u9645\u7f16\u7a0b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u5728for\u5faa\u73af\u4e2d\u4f7f\u7528iterable<\/code>\uff0cPython\u4f1a\u81ea\u52a8\u4e3a\u6211\u4eec\u5904\u7406iterator<\/code>\u7684\u521b\u5efa\u548c\u7ba1\u7406\u3002\u4f8b\u5982\uff0c\u5f53\u6211\u4eec\u8fed\u4ee3\u4e00\u4e2a\u5217\u8868\u65f6\uff0cPython\u9996\u5148\u4ece\u5217\u8868\u521b\u5efa\u4e00\u4e2aiterator<\/code>\uff0c\u7136\u540e\u4f7f\u7528\u8fd9\u4e2aiterator<\/code>\u9010\u4e2a\u53d6\u51fa\u5217\u8868\u4e2d\u7684\u6bcf\u4e2a\u9879\u76ee\u3002<\/p>\n\n\n\n

8\u3001\u8f6c\u6362\u65b9\u6cd5<\/h2>\n\n\n\n

\u5bf9\u4e8eiterable<\/code>\u5bf9\u8c61\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528iter()<\/code>\u65b9\u6cd5\u8f6c\u6362\u4e3aiterator<\/code>\u3002\u5bf9\u4e8eiterator<\/code>\u5bf9\u8c61\uff0c\u4f7f\u7528next()<\/code>\u65b9\u6cd5\u53ef\u4ee5\u83b7\u53d6\u4e0b\u4e00\u4e2a\u503c\uff0c\u5f53\u6ca1\u6709\u66f4\u591a\u7684\u5143\u7d20\u65f6\uff0c\u4f1a\u629b\u51faStopIteration<\/code>\u5f02\u5e38\u3002<\/p>\n\n\n\n

\u603b\u7ed3<\/strong>\uff1a\u7406\u89e3iterator<\/code>\u548citerable<\/code>\u7684\u5dee\u5f02\u662f\u638c\u63e1Python\u8fed\u4ee3\u7684\u5173\u952e\u3002\u867d\u7136\u5728\u8bb8\u591a\u60c5\u51b5\u4e0b\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u4f9d\u8d56Python\u7684\u5185\u90e8\u673a\u5236\u81ea\u52a8\u5904\u7406\u5b83\u4eec\uff0c\u4f46\u4e86\u89e3\u5b83\u4eec\u7684\u5185\u90e8\u5de5\u4f5c\u539f\u7406\u4f1a\u4f7f\u60a8\u66f4\u52a0\u7cbe\u901aPython\u7f16\u7a0b\u3002<\/p>\n\n\n\n

\n\n\n\n

\u5e38\u89c1\u95ee\u7b54<\/strong><\/h2>\n\n\n\n
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Q1:<\/strong> \u4ec0\u4e48\u662fPython\u4e2d\u7684StopIteration<\/code>\u5f02\u5e38\uff1f<\/p>\n\n\n\n

A1:<\/strong> \u5728Python\u4e2d\uff0cStopIteration<\/code>\u662f\u4e00\u4e2a\u5185\u5efa\u7684\u5f02\u5e38\uff0c\u7528\u4e8e\u6807\u8bc6\u8fed\u4ee3\u5668\u4e2d\u6ca1\u6709\u66f4\u591a\u7684\u5143\u7d20\u53ef\u4ee5\u88ab\u8fd4\u56de\u3002\u901a\u5e38\uff0c\u8fd9\u4e2a\u5f02\u5e38\u7531__next__()<\/code>\u65b9\u6cd5\u5728\u8fed\u4ee3\u5668\u7684\u5143\u7d20\u90fd\u88ab\u53d6\u5b8c\u540e\u629b\u51fa\u3002\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u8fd9\u4e2a\u5f02\u5e38\u4f1a\u88abfor\u5faa\u73af\u6216\u5176\u4ed6\u8fed\u4ee3\u7ed3\u6784\u81ea\u52a8\u6355\u6349\uff0c\u4ece\u800c\u7ed3\u675f\u8fed\u4ee3\u3002<\/p>\n<\/div>\n\n\n\n

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Q2:<\/strong> iterable<\/code>\u548citerator<\/code>\u5728Python\u4e2d\u6709\u54ea\u4e9b\u5185\u5efa\u7684\u793a\u4f8b\uff1f<\/p>\n\n\n\n

A2:<\/strong> \u5728Python\u4e2d\uff0c\u8bb8\u591a\u5185\u5efa\u7c7b\u578b\u90fd\u662fiterable<\/code>\u7684\u3002\u4f8b\u5982\uff0c\u5217\u8868(list)\u3001\u5143\u7ec4(tuple)\u3001\u5b57\u7b26\u4e32(str)\u3001\u5b57\u5178(dict)\u548c\u96c6\u5408(set)\u7b49\u3002\u800citerator<\/code>\u7684\u4e00\u4e2a\u5e38\u89c1\u793a\u4f8b\u662f\u4f7f\u7528iter()<\/code>\u51fd\u6570\u4eceiterable<\/code>\u521b\u5efa\u7684\u5bf9\u8c61\uff0c\u6216\u8005\u662f\u6587\u4ef6\u5bf9\u8c61\uff0c\u56e0\u4e3a\u6587\u4ef6\u5bf9\u8c61\u53ef\u4ee5\u8fed\u4ee3\u5176\u4e2d\u7684\u6bcf\u4e00\u884c\u3002<\/p>\n<\/div>\n\n\n\n

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Q3:<\/strong> \u6211\u53ef\u4ee5\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\u5417\uff1f<\/p>\n\n\n\n

A3:<\/strong> \u662f\u7684\uff0c\u60a8\u53ef\u4ee5\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\u3002\u8981\u521b\u5efa\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u60a8\u9700\u8981\u5b9a\u4e49\u4e00\u4e2a\u7c7b\u5e76\u5b9e\u73b0__iter__()<\/code>\u548c__next__()<\/code>\u65b9\u6cd5\u3002\u5176\u4e2d__iter__()<\/code>\u65b9\u6cd5\u8fd4\u56de\u8fed\u4ee3\u5668\u5bf9\u8c61\u672c\u8eab\uff0c__next__()<\/code>\u65b9\u6cd5\u8fd4\u56de\u5bb9\u5668\u7684\u4e0b\u4e00\u4e2a\u503c\u3002\u5f53\u6240\u6709\u5143\u7d20\u90fd\u88ab\u8fed\u4ee3\u5b8c\u6bd5\u65f6\uff0c__next__()<\/code>\u65b9\u6cd5\u5e94\u8be5\u629b\u51faStopIteration<\/code>\u5f02\u5e38\u3002<\/p>\n<\/div>\n\n\n\n

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Q4:<\/strong> iterable<\/code>\u548citerator<\/code>\u6709\u4f55\u6027\u80fd\u4e0a\u7684\u8003\u8651\uff1f<\/p>\n\n\n\n

A4:<\/strong> iterable<\/code>\u901a\u5e38\u5305\u542b\u6240\u6709\u7684\u6570\u636e\uff0c\u56e0\u6b64\u5982\u679c\u6570\u636e\u96c6\u975e\u5e38\u5927\uff0c\u5b83\u53ef\u80fd\u4f1a\u5360\u7528\u5927\u91cf\u7684\u5185\u5b58\u3002\u800citerator<\/code>\u662f”\u60f0\u6027”\u7684\uff0c\u53ea\u5728\u6bcf\u6b21\u8bf7\u6c42\u65f6\u4ea7\u751f\u4e00\u4e2a\u5143\u7d20\uff0c\u56e0\u6b64\u5b83\u66f4\u4e3a\u5185\u5b58\u9ad8\u6548\u3002\u5bf9\u4e8e\u5927\u6570\u636e\u96c6\u6216\u65e0\u9650\u6570\u636e\u6d41\uff0c\u4f7f\u7528\u8fed\u4ee3\u5668\u53ef\u4ee5\u8282\u7701\u5185\u5b58\u5e76\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6548\u7387\u3002<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"\u5728Python\u7f16\u7a0b\u4e2d\uff0citerator\u548citerable\u662f\u4e24\u4e2a\u7ecf\u5e38\u88ab\u63d0\u53ca\u7684\u6982\u5ff5\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u5e8f\u5217\u548c\u96c6\u5408\u6570\u636e\u7ed3\u6784 […]","protected":false},"author":7,"featured_media":54402,"comment_status":"closed","ping_status":"open","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\/54400"}],"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\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=54400"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/54400\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/54402"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=54400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=54400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=54400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}