{"id":2550,"date":"2019-12-19T14:24:09","date_gmt":"2020-02-12T14:02:00","guid":{"rendered":"http:\/\/vip.fxxkpython.com\/?p=2550"},"modified":"2020-02-12T22:02:05","modified_gmt":"2020-02-12T14:02:05","slug":"36158c3046","status":"publish","type":"post","link":"https:\/\/vip.fxxkpython.com\/?p=2550","title":{"rendered":"\u4f60\u5e38\u770b\u5230 Python \u4ee3\u7801\u4e2d\u7684 yield \u5230\u5e95\u662f\u4ec0\u4e48\u9b3c\uff1f"},"content":{"rendered":"
\n


<\/p>\n

\u4e4b\u524d\u7ed9\u5927\u5bb6\u8bf4\u8fc7\uff0c\u4e45\u4e45\u4f1a\u89e3\u9501\u4e00\u7bc7 VIP<\/a> \u4e2d\u7684\u6587\u7ae0\u7ed9\u5927\u4f19\u4e50\u5475\u4e50\u5475\uff0c\u5176\u5b9e\u662f\u88ab\u5410\u69fd\u6ca1\u6709\u8bd5\u770b\u6587\u3002<\/span><\/section>\n


<\/p>\n


<\/p>\n


<\/p>\n

\"python\"<\/section>\n


<\/p>\n


<\/p>\n


<\/p>\n


<\/p>\n

\u597d\u5427\uff0c\u4eca\u5929\u5c31\u662f\u8fd9\u4e48\u51fa\u5176\u4e0d\u610f\u653b\u5176\u4e0d\u5907\uff0c\u5c31\u968f\u4fbf\u6311\u9009\u4e00\u7bc7\u51fa\u6765\u7ed9\u4f60\u77a7\u77a7\u8d27\u8272\uff1a yield \u5230\u5e95\u662f\u5e72\u5c4c\u7684\uff1f<\/span><\/strong>
<\/section>\n


<\/p>\n


<\/p>\n

\u9996\u5148\u6211\u4eec\u6765\u770b\u4e0b\u8fd9\u4e24\u4e2a\u5217\u8868\u7684\u533a\u522b\uff1a<\/span><\/p>\n

<\/figure>\n


<\/p>\n


<\/span><\/p>\n


<\/p>\n

\"python\"<\/figure>\n


<\/p>\n


<\/section>\n
\u53ef\u4ee5\u770b\u5230\uff0c list_1 \u662f [i for i in range(20)] \uff0c\u800c list_2 \u662f (i for i in range(20))\uff0c\u4e3b\u8981\u533a\u522b\u5c31\u662f\u4e00\u4e2a\u662f [] , \u4e00\u4e2a\u662f \uff08\uff09\uff0c\u800c\u540e\u8005\u5c31\u662f\u751f\u6210\u5668\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5f53\u6211\u4eec\u53bb\u6267\u884c list_2 \u7684\u65f6\u5019\uff0c\u8f93\u51fa\u7ed3\u679c\u662f\u4e00\u4e2a generator\uff08\u751f\u6210\u5668\uff09\u5bf9\u8c61\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 next() \u53bb\u8c03\u7528\u8fd9\u4e2a\u751f\u6210\u5668\u91cc\u9762\u7684\u5143\u7d20\uff1a<\/section>\n

<\/section>\n

<\/section>\n


<\/p>\n

\"python\"<\/figure>\n


<\/p>\n


<\/p>\n


<\/p>\n

\u6211\u60f3\u5230\u8fd9\u91cc\u4f60\u4f1a\u6709\u70b9\u7591\u60d1\uff0c\u5c31\u662f\u5b83\u4eec\u4e4b\u95f4\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/section>\n

<\/section>\n

<\/section>\n
\u6211\u4eec\u8fd9\u6837\uff0c\u6765\u8ba1\u7b97\u4e00\u4e0b\u4ee5\u4e0b\u8fd9\u4e24\u4e2a\u5217\u8868\u751f\u6210\u6240\u9700\u8981\u7684\u65f6\u95f4\uff1a<\/section>\n

<\/section>\n

<\/section>\n
list_1 = [i for i in range(66666666)]<\/span><\/strong><\/span><\/section>
list_2 = (i for i in range(66666666))<\/span><\/strong><\/span><\/section>

<\/section><\/pre>\n

<\/section>\n
\u6211\u4eec\u5206\u522b\u628a\u5b83\u4eec\u653e\u5230\u65b9\u6cd5\u91cc\u9762\u6267\u884c\uff0c\u7136\u540e\u7528\u88c5\u9970\u5668\u7684\u65b9\u5f0f\u5bf9\u5b83\u4eec\u5404\u81ea\u7684\u65b9\u6cd5\u6267\u884c\u65f6\u95f4\u505a\u4e2a\u8bb0\u5f55\uff1a<\/section>\n

<\/section>\n

<\/p>\n
\"python\"<\/figure>\n

<\/p>\n

<\/section>\n
\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/section>\n

<\/section>\n

<\/p>\n
\"python\"<\/figure>\n

<\/figure>\n

<\/p>\n
\u4f60\u4f1a\u53d1\u73b0\uff0c\u65b9\u6cd5\u4e8c\uff0c\u4e5f\u5c31\u662f\u751f\u6210\u5668\u751f\u6210\u7684\u5217\u8868 list_2 \u6240\u6d88\u8017\u7684\u65f6\u95f4\u8fdc\u4f4e\u4e8e list_1\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u8fd9\u662f\u56e0\u4e3a\u4f7f\u7528\u5217\u8868\u751f\u6210\u5f0f\u751f\u6210\u7684\u5217\u8868\uff0c\u662f\u56fa\u5b9a\u7684\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u6211\u4eec\u6267\u884c [i for i in range(66666666)] \u7684\u65f6\u5019\uff0c list_1 \u8fd9\u4e2a\u5217\u8868\u6240\u5c01\u88c5\u7684\u5143\u7d20\u4e2a\u6570\u5c31\u662f 66666666  \u4e2a\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u800c\u751f\u6210\u5668\u751f\u6210\u7684 list_2 \u5c31\u4e0d\u662f\u8fd9\u6837\uff0c\u5b83\u662f\u8bb0\u5f55\u4e86\u4e00\u5b9a\u7684\u7b97\u6cd5\u89c4\u5219\uff0c\u6bd4\u5982\u6211\u4eec\u8fd9\u91cc\u7684 for i in range(66666666) \u5c31\u662f\u4e0d\u65ad\u7684 +=1 \uff0c\u751f\u6210\u5668\u53ea\u8981\u8bb0\u4f4f\u8fd9\u4e2a\u89c4\u5219\u5c31\u53ef\u4ee5\u4e86\uff0c\u4e0d\u9700\u8981\u5c06\u5168\u90e8\u7684\u6570\u636e\u90fd\u76f4\u63a5\u4e00\u80a1\u8111\u7684\u88c5\u8fdb list_2 \uff0c\u800c\u662f\u7b49\u5230\u6211\u4eec\u9700\u8981\u7684\u65f6\u5019\uff0c\u6211\u4eec\u53bb\u8c03\u7528\u7684\u65f6\u5019\uff0c\u5b83\u518d\u53bb\u7b97\u4e00\u4e0b\uff0c\u7136\u540e\u628a\u76f8\u5e94\u7684\u6570\u636e\u8fd4\u56de\u7ed9\u6211\u4eec\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u8fd9\uff0c\u5c31\u662f\u751f\u6210\u5668\uff0c\u8bb0\u4f4f\u4e00\u70b9\uff0c\u5b83\u662f\u6839\u636e\u4e00\u5b9a\u7684\u89c4\u5f8b\u7b97\u6cd5\u751f\u6210\u7684\uff0c\u5f53\u6211\u4eec\u53bb\u904d\u5386\u5b83\u7684\u65f6\u5019\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7\u7279\u5b9a\u7684\u7b97\u6cd5\u4e0d\u65ad\u7684\u63a8\u7b97\u51fa\u76f8\u5e94\u7684\u5143\u7d20\uff0c\u8fb9\u8fd0\u884c\u8fb9\u63a8\u7b97\u7ed3\u679c\uff0c\u4ece\u800c\u8282\u7701\u4e86\u5f88\u591a\u7a7a\u95f4\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u4f53\u4f1a\u4e0b\u4e0b\u9762\u8fd9\u4e24\u8005\u7684\u533a\u522b\uff1a<\/section>\n

<\/section>\n

<\/p>\n
\"python\"<\/figure>\n

<\/p>\n

<\/p>\n
\u77e5\u9053\u4e86\u4ec0\u4e48\u662f\u751f\u6210\u5668\u4e4b\u540e\uff0c\u54b1\u4eec\u518d\u6765\u770b\u770b\u8fd9\u4e2a\u9b54\u6cd5\u5173\u952e\u8bcd\uff1ayield\u3002<\/section>\n

<\/section>\n

<\/section>\n
yield \u548c return \u6709\u70b9\u76f8\u4f3c\uff0creturn \u8fd9\u4e2a\u5173\u952e\u8bcd\u4f60\u5e94\u8be5\u5f88\u719f\u6089\u5427\uff0c\u5728\u51fd\u6570\u4e2d\u53ea\u8981\u6267\u884c\u5230\u8fd9\u4e2a\u5173\u952e\u8bcd\uff0c\u5c31\u4f1a\u8fd4\u56de\u76f8\u5e94\u7684\u7ed3\u679c\u5e76\u4e14\u7ec8\u6b62\u51fd\u6570\u7684\u6267\u884c\uff1a<\/section>\n

<\/section>\n

<\/section>\n
\"python\"<\/figure>\n

<\/p>\n

<\/section>\n
\u5f88\u597d\u7406\u89e3\uff0c\u8fd9\u91cc\u8fd4\u56de 3 \u800c\u4e0d\u4f1a\u7ee7\u7eed\u8fd4\u56de hahahahah\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u90a3\u4e48 yield \u53c8\u662f\u600e\u4e48\u6837\u7684\u5462\uff1f\u54b1\u4eec\u7ee7\u7eed\u770b\uff1a<\/span><\/section>\n

<\/span><\/section>\n

<\/p>\n
\"python\"<\/figure>\n

<\/figure>\n

<\/p>\n
\u5728\u8fd9\u91cc\u9762\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a foo \u65b9\u6cd5\uff0c\u5e76\u4e14\u5728\u91cc\u9762\u5b9a\u4e49\u4e86\u597d\u51e0\u4e2a yield \uff0c\u53ef\u662f\u5f53\u6211\u4eec\u8c03\u7528\u8fd9\u4e2a\u65b9\u6cd5\u7684\u65f6\u5019\uff0c\u5c45\u7136\u8ddf\u4ec0\u4e48\u90fd\u6ca1\u6709\u8f93\u51fa\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u90a3\u4e48\u6211\u4eec\u6765\u770b\u770b\u8c03\u7528\u4e86\u8fd9\u4e2a foo \u51fd\u6570\u4e4b\u540e\u5f97\u5230\u7684\u662f\u4ec0\u4e48\u7c7b\u578b\uff1a<\/section>\n

<\/section>\n

<\/section>\n
\"python\"<\/figure>\n

<\/p>\n

<\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5b83\u662f\u4e00\u4e2a\u751f\u6210\u5668\uff01<\/section>\n

<\/section>\n

<\/section>\n
\u662f\u7684\uff0c\u4e00\u4e2a\u51fd\u6570\u91cc\u9762\u5982\u679c\u88ab\u5b9a\u4e49\u4e86 yield \uff0c\u90a3\u4e48\u8fd9\u4e2a\u51fd\u6570\u5c31\u662f\u4e00\u4e2a\u751f\u6210\u5668\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 next \u65b9\u6cd5\u6765\u4f7f\u7528\u8fd9\u4e2a\u751f\u6210\u5668\uff1a<\/section>\n

<\/section>\n

<\/section>\n
\"python\"<\/figure>\n

<\/p>\n

<\/section>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u5f53\u6211\u4eec\u7b2c\u4e00\u6b21\u8c03\u7528\u7684\u65f6\u5019\uff0c\u9047\u5230\u7b2c\u4e00\u4e2a yield \u7684\u65f6\u5019\u5c31\u8df3\u51fa\u51fd\u6570\u4e86\uff0c\u7b2c\u4e8c\u6b21\u8c03\u7528\u7684\u65f6\u5019\u5c31\u662f\u4ece\u7b2c 1 \u4e2a yield \u5f00\u59cb\uff0c\u7b2c\u4e09\u4e2a yield \u7ed3\u675f\uff0c\u4ee5\u6b64\u7c7b\u63a8\u3002\u76f4\u5230 next \u6ca1\u6709\u6570\u636e\u4e4b\u540e\u62a5 StopIteration\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u65e2\u7136\u5b83\u662f\u4e00\u4e2a\u751f\u6210\u5668\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u904d\u5386\u5b83\uff0c\u6211\u4eec\u5177\u4f53\u6253\u5370\u51fa\u6bcf\u4e2a\u5177\u4f53\u7684\u5143\u7d20\uff0c\u770b\u770b\u662f\u4ec0\u4e48\uff1a<\/section>\n

<\/section>\n

<\/section>\n
\"python\"<\/figure>\n

<\/p>\n

<\/p>\n
\u53ef\u4ee5\u770b\u5230\u6211\u4eec\u8fd9\u91cc\u5f97\u5230\u7684\u90fd\u662f None \uff0c\u8fd9\u662f\u56e0\u4e3a\u6211\u4eec yield \u7684\u65f6\u5019\u6ca1\u6709\u8fd4\u56de\u5177\u4f53\u6570\u636e\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u6837\uff1a<\/section>\n

<\/section>\n

<\/section>\n
\"python\"<\/figure>\n

<\/p>\n

<\/p>\n
\u8fd9\u6837\u6211\u4eec\u5c31\u53ef\u4ee5\u5f97\u5230\u7684\u751f\u6210\u5668\u91cc\u9762\u5177\u4f53\u7684\u5143\u7d20\u4e86\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u4e0d\u8fc7\u5462\uff0c\u6211\u4eec\u4e00\u822c\u4e0d\u4f1a\u8fd9\u4e48\u5199\uff0c\u6211\u521a\u521a\u8bf4\u4e86\uff0c\u751f\u6210\u5668\u662f\u6839\u636e\u4e00\u5b9a\u7684\u89c4\u5f8b\u7b97\u6cd5\u751f\u6210\u7684\u5217\u8868\uff0c\u5f53\u6211\u4eec\u53bb\u904d\u5386\u5b83\u7684\u65f6\u5019\uff0c\u5b83\u53ef\u4ee5\u901a\u8fc7\u7279\u5b9a\u7684\u7b97\u6cd5\u4e0d\u65ad\u7684\u63a8\u65ad\u51fa\u76f8\u5e94\u7684\u5143\u7d20\uff0c\u8fb9\u8fd0\u884c\u8fb9\u63a8\u7b97\u7ed3\u679c\uff0c\u8282\u7701\u7a7a\u95f4\u3002<\/section>\n

<\/section>\n

<\/section>\n
\u6240\u4ee5 yield \u4e00\u822c\u4f1a\u5728 for \u5faa\u73af\u8bed\u53e5\u4ee5\u4e00\u5b9a\u7684\u89c4\u5219\u751f\u6210\uff0c\u4e3e\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u4f8b\u5b50\uff0c\u751f\u6210\u8fd9\u4e48\u4e9b\u5076\u6570\uff1a<\/section>\n

<\/section>\n

<\/p>\n

<\/p>\n
\"python\"<\/figure>\n

<\/p>\n

<\/section>\n
\u8fd9\u6837\u6211\u4eec\u5728\u8c03\u7528 foo \u7684\u65f6\u5019\u5c31\u4f1a\u5f97\u5230\u4e00\u4e2a\u751f\u6210\u5668\uff0c\u7136\u540e\u5c31\u53ef\u4ee5\u76f4\u63a5\u904d\u5386\u4f7f\u7528\u3002\u53e6\u5916\uff0cyield \u540e\u9762\u53ef\u4ee5\u8ddf\u5e38\u7528\u7684\u6570\u636e\u7c7b\u578b\uff0c\u6bd4\u5982 string\uff0cint\uff0cdict\uff1a<\/section>\n

<\/section>\n

<\/p>\n
\"python\"<\/figure>\n

<\/figure>\n

<\/p>\n
\u90a3\u4e48\u5f53\u4f60\u4e0b\u6b21\u53bb\u8c03\u7528\u76f8\u5e94\u7684\u51fd\u6570\u5c31\u4f1a\u5f97\u5230\u8fd9\u6837\u7684 generator\uff0c\u4e8e\u662f\u5c31\u53ef\u4ee5\uff1aOMG\uff0c\u6839\u636e\u5bf9\u5e94\u7684\u89c4\u5219\u904d\u5386\u5b83\uff01 <\/span><\/p>\n

<\/p>\n
ok\uff0c\u4ee5\u4e0a\u5c31\u662f\u751f\u6210\u5668\u548c yield \u7684\u7528\u6cd5\uff0c\u4f60\u4ee5\u540e\u8fd8\u4f1a\u7ecf\u5e38\u770b\u5230\u5b83\u7684\u8eab\u5f71\uff0c\u6211\u4eec\u4e0b\u56de\u89c1\uff0c<\/span>peace\uff01<\/span><\/strong><\/section>\n

<\/p>\n

<\/figure>\n

<\/figure>\n
\"python\"<\/p>\n

<\/p>\n
\u626b\u4e00\u626b<\/strong><\/span><\/p>\n
\u5b66\u4e60 Python \u6ca1\u70e6\u607c<\/strong><\/span><\/span><\/p>\n

<\/strong><\/p>\n

<\/span><\/strong><\/p>\n
\"python\"<\/p>\n

<\/p>\n
\n
\u539f\u6587\u59cb\u53d1\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7\uff08\u5b66\u4e60python\u7684\u6b63\u786e\u59ff\u52bf\uff09\uff1apython<\/a><\/p>\n<\/blockquote>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
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