{"id":163,"date":"2021-07-05T23:36:27","date_gmt":"2021-07-05T15:36:27","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/python\/?p=163"},"modified":"2021-07-06T18:33:47","modified_gmt":"2021-07-06T10:33:47","slug":"python%e7%9a%84%e7%94%9f%e6%88%90%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/python\/post-163.html","title":{"rendered":"python\u7684\u751f\u6210\u5668"},"content":{"rendered":"\n

python\u7684\u751f\u6210\u5668( generator ), \u662f\u4e00\u79cd\u7279\u6b8a\u7684\u8fed\u4ee3\u5668<\/p>\n\n\n\n

\u751f\u6210\u5668, \u4f1a\u81ea\u52a8\u751f\u6210\u53ef\u8fed\u4ee3\u5bf9\u8c61<\/p>\n\n\n\n

()\u521b\u5efa\u65b9\u5f0f<\/h2>\n\n\n\n

\u751f\u6210\u5668\u6709\u591a\u79cd\u521b\u5efa\u65b9\u6cd5, \u7b2c\u4e00\u79cd\u65b9\u6cd5, \u662f\u628a\u4e00\u4e2a\u5217\u8868\u7684[]\u6539\u6210()<\/p>\n\n\n\n

L = [ x*2 for x in range(5)]\nL\n[0, 2, 4, 6, 8]\n\n# \u751f\u6210\u5668\nG = ( x*2 for x  in range(5))\nG\n<generator object <genexpr> at 0x0000013B46D1AA98>\n# \u904d\u5386\u5bf9\u8c61\nfor temp in G:\n    print(temp)\n0\n2\n4\n6\n8<\/code><\/pre>\n\n\n\n
yield\u521b\u5efa\u65b9\u5f0f<\/h2>\n\n\n\n
\u5bf9\u4e8e\u7a0d\u5fae\u590d\u6742\u4e00\u70b9\u7684\u751f\u6210\u5668, \u53ef\u4ee5\u4f7f\u7528\u51fd\u6570\u5f62\u5f0f\u521b\u5efa<\/p>\n\n\n\n
\u8fd9\u91cc\u4f7f\u7528\u7684\u5173\u952e\u5b57\u662f yield, \u53ea\u8981\u51fd\u6570\u4e2d\u5b58\u5728\u6b64\u5173\u952e\u5b57, \u5219\u4f1a\u88ab\u5f53\u4f5c\u662f\u751f\u6210\u5668, \u4e0d\u518d\u662f\u7b80\u5355\u7684\u65b9\u6cd5\u8c03\u7528, \u800c\u662f\u8fd4\u56de\u4e00\u4e2a\u53ef\u8fed\u4ee3\u5bf9\u8c61<\/p>\n\n\n\n
def fib(n):\n    current = 0\n    num1, num2 = 0, 1\n    while current < n:\n        num1, num2 = num2, num1 + num2\n        current += 1\n        yield num1\n\n\nf = fib(5)\n\nfor temp in f:\n    print(temp)<\/code><\/pre>\n\n\n\n
\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c:<\/p>\n\n\n\n
1\n1\n2\n3\n5<\/code><\/pre>\n\n\n\n
send\u521b\u5efa\u65b9\u5f0f<\/h2>\n\n\n\n
\u8981\u83b7\u53d6\u8fed\u4ee3\u5668\u5bf9\u8c61, \u53ef\u4ee5\u4f7f\u7528 iter(\u5bf9\u8c61) \u51fd\u6570, \u800c\u83b7\u53d6\u4e00\u6b21\u8fed\u4ee3\u5185\u5bb9, \u53ef\u4ee5\u4f7f\u7528 next(\u53ef\u8fed\u4ee3\u5bf9\u8c61) , \u4f46 next \u4e0d\u80fd\u6307\u5b9a\u53c2\u6570, \u82e5\u5e0c\u671b\u7075\u6d3b\u7684\u4f20\u53c2, \u53ef\u4ee5\u4f7f\u7528 send \u65b9\u5f0f<\/p>\n\n\n\n
send(\u53c2\u6570)\u65b9\u5f0f, \u76f8\u5f53\u4e8e next(\u53c2\u6570), \u800c\u65e0\u6cd5\u76f4\u63a5 next(\u53c2\u6570)<\/p>\n\n\n\n
def fib(n):\n    current = 0\n    num1, num2 = 0, 1\n    while current < n:\n        num1, num2 = num2, num1 + num2\n        current += 1\n        res = yield num1\n        print(\"res=\"+str(res))\n\n\nf = fib(5)\n\nret = next(f)\nprint(ret)\n\nret = next(f)\nprint(ret)\n\nret = f.send(\"abc\")\nprint(ret)<\/code><\/pre>\n\n\n\n
\u7a0b\u5e8f\u7ed3\u679c\u5982\u4e0b:<\/p>\n\n\n\n
1\nres=None\n1\nres=abc\n2<\/code><\/pre>\n\n\n\n
send \u53ef\u4ee5\u4f20\u9012\u53c2\u6570, \u800cnext\u4e0d\u53ef\u4ee5\u4f20\u53c2, \u800c\u51fd\u6570\u5185\u901a\u8fc7 \u53d8\u91cf=yield\u5f97\u5230, \u82e5\u7b2c\u4e00\u6b21\u5c31\u4f7f\u7528send\u5fc5\u987b\u4f20\u9012None<\/p>\n\n\n\n
\u6b64\u5916, \u751f\u6210\u5668\u51fd\u6570\u82e5\u6709\u8fd4\u56de\u503c, \u53ef\u4ee5\u5728\u51fd\u6570\u7ec8\u6b62\u540e, \u5373\u629b\u51fa\u4e86\u5f02\u5e38\u540e, \u901a\u8fc7\u5f02\u5e38.value\u83b7\u53d6\u5230\u8fd4\u56de\u503c<\/p>\n","protected":false},"excerpt":{"rendered":"
python\u7684\u751f\u6210\u5668( generator ), \u662f\u4e00\u79cd\u7279\u6b8a\u7684\u8fed\u4ee3\u5668 \u751f\u6210\u5668, \u4f1a\u81ea\u52a8\u751f\u6210\u53ef\u8fed\u4ee3\u5bf9\u8c61 ()\u521b\u5efa… \u7ee7\u7eed\u9605\u8bfb python\u7684\u751f\u6210\u5668<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[18],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/posts\/163"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/comments?post=163"}],"version-history":[{"count":1,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/posts\/163\/revisions"}],"predecessor-version":[{"id":164,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/posts\/163\/revisions\/164"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/media?parent=163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/categories?post=163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/tags?post=163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}