{"id":161,"date":"2021-07-05T22:30:39","date_gmt":"2021-07-05T14:30:39","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/python\/?p=161"},"modified":"2021-07-05T23:01:16","modified_gmt":"2021-07-05T15:01:16","slug":"python%e7%9a%84%e8%bf%ad%e4%bb%a3%e5%99%a8","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/python\/post-161.html","title":{"rendered":"python\u7684\u8fed\u4ee3\u5668"},"content":{"rendered":"\n

\u8fed\u4ee3, \u662f\u4e00\u79cd\u5faa\u73af\u904d\u5386\u65b9\u5f0f, \u53ef\u8fed\u4ee3\u5bf9\u8c61\u6307\u7684\u662f\u80fd\u88ab\u904d\u5386\u5bf9\u8c61<\/p>\n\n\n\n

\u5e76\u975e\u6240\u6709\u7684\u6570\u636e\u7c7b\u578b, \u90fd\u53ef\u4ee5\u4f7f\u7528\u8fed\u4ee3\u5668<\/p>\n\n\n\n

\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u53ef\u4ee5\u8fed\u4ee3<\/strong><\/p>\n\n\n\n

\u5224\u65ad\u5b83\u662f\u5426\u7ee7\u627f\u81eaIterable, \u5982\u679c\u662f, \u5219\u53ef\u4ee5\u8fed\u4ee3<\/p>\n\n\n\n

1.\u5bfc\u5165Iterable\u7c7b<\/p>\n\n\n\n

from collections import Iterable<\/code><\/pre>\n\n\n\n
2.\u4f7f\u7528isinstance\u5224\u65ad\u7ee7\u627f\u5173\u7cfb<\/p>\n\n\n\n
isinstance([11, 22, 33], Iterable)<\/code><\/pre>\n\n\n\n
\u7ed3\u679c\u8fd4\u56detrue, \u8bf4\u660elist\u53ef\u4ee5\u8fed\u4ee3, \u5176\u4ed6\u7c7b\u578b\u4e5f\u53ef\u4ee5\u4f7f\u7528\u6b64\u65b9\u6cd5<\/p>\n\n\n\n
\u8fed\u4ee3\u5668\u5b9e\u4f8b<\/h2>\n\n\n\n
\u8fed\u4ee3\u5668\u5bf9\u8c61, \u53ef\u4ee5\u88abfor in\u5faa\u73af\u904d\u5386<\/p>\n\n\n\n
class Classmate(object):\n    def __init__(self):\n        self.names = list()\n        self.current_num = 0\n\n    def add(self, name):\n        self.names.append(name)\n\n    def __iter__(self):\n        \"\"\"\u5fc5\u987b\u5b9e\u73b0__iter__\u65b9\u6cd5\"\"\"\n        return self    # \u5fc5\u987b\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61, \u8be5\u5bf9\u8c61\u5177\u6709__iter__\u65b9\u6cd5\u548c__next__\u65b9\u6cd5\n\n    def __next__(self):     # next\u65b9\u6cd5\u4f1a\u81ea\u52a8\u88abfor\u8c03\u7528, \u8fd4\u56de\u6bcf\u6b21\u8fed\u4ee3\u6570\u636e\n        if self.current_num < len(self.names):\n            ret = self.names[self.current_num]\n            self.current_num += 1\n            return ret\n        else:\n            raise StopIteration  # \u7ec8\u6b62for, \u5426\u5219\u4e0d\u4f1a\u505c\u6b62\n\n\ndef main():\n    classmate = Classmate()\n    classmate.add(\"\u8001\u738b\")\n    classmate.add(\"\u5927\u738b\")\n    classmate.add(\"\u5c0f\u738b\")\n\n    # \u8fed\u4ee3\u6b64\u5bf9\u8c61\n    for temp in classmate:\n        print(temp)\n\n\nif __name__ == \"__main__\":\n    main()\n<\/code><\/pre>\n\n\n\n
list\u5728\u751f\u6210\u540e, \u5c31\u5360\u636e\u5927\u91cf\u7684\u5185\u5b58\u7a7a\u95f4, \u5373\u4f7f\u4e0d\u88ab\u8c03\u7528<\/p>\n\n\n\n
\u666e\u901a\u7684\u5faa\u73afwhile\u5faa\u73af\u505a\u5230, \u4f46\u5bf9\u8c61\u7684\u904d\u5386\u4f7f\u7528\u8fed\u4ee3\u5668\u66f4\u65b9\u4fbf<\/p>\n\n\n\n
\u8fed\u4ee3\u5668\u7684\u4f18\u70b9, \u662f\u5360\u7528\u6781\u5c0f\u7684\u5185\u5b58\u7a7a\u95f4, \u5b83\u8fd4\u56de\u7684\u662f\u5bf9\u8c61, \u4ec5\u5728\u88ab\u8c03\u7528\u65f6\u751f\u6210\u8fed\u4ee3\u6570\u636e, \u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u66ff\u4ee3list ( \u4e5f\u53ef\u4ee5\u7528while\u66ff\u4ee3list )<\/p>\n\n\n\n
\u5728py2\u4e2drange\u8fd4\u56de\u7684\u662flist, \u800cxrange\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5bf9\u8c61, \u540e\u8005\u5360\u7528\u6781\u5c0f\u5185\u5b58, \u4e0d\u8fc7\u5728py3\u4e2drange\u5df2\u7ecf\u6539\u53d8, \u8fd4\u56de\u7684\u662f\u5bf9\u8c61<\/p>\n\n\n\n
\u6b64\u5916, \u5e76\u4e0d\u662f\u53ea\u6709for\u5faa\u73af\u80fd\u63a5\u6536\u53ef\u8fed\u4ee3\u5bf9\u8c61,  list, tuple\u7b49\u4e5f\u53ef\u4ee5, \u5728\u7c7b\u578b\u8f6c\u6362\u65f6, \u5185\u90e8\u5176\u5b9e\u7528\u5230\u4e86\u8fed\u4ee3\u5668\u91cd\u65b0\u751f\u6210\u6570\u636e<\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fed\u4ee3, \u662f\u4e00\u79cd\u5faa\u73af\u904d\u5386\u65b9\u5f0f, \u53ef\u8fed\u4ee3\u5bf9\u8c61\u6307\u7684\u662f\u80fd\u88ab\u904d\u5386\u5bf9\u8c61 \u5e76\u975e\u6240\u6709\u7684\u6570\u636e\u7c7b\u578b, \u90fd\u53ef\u4ee5\u4f7f\u7528\u8fed\u4ee3\u5668 \u5224\u65ad\u5bf9\u8c61\u662f… \u7ee7\u7eed\u9605\u8bfb python\u7684\u8fed\u4ee3\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\/161"}],"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=161"}],"version-history":[{"count":0,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/posts\/161\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/media?parent=161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/categories?post=161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/python\/wp-json\/wp\/v2\/tags?post=161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}