{"id":50731,"date":"2023-12-23T10:31:39","date_gmt":"2023-12-23T02:31:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/python%e7%9a%84map%e5%87%bd%e6%95%b0\/"},"modified":"2023-12-23T15:31:51","modified_gmt":"2023-12-23T07:31:51","slug":"python%e7%9a%84map%e5%87%bd%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/python%e7%9a%84map%e5%87%bd%e6%95%b0\/","title":{"rendered":"Python\u7684map()\u51fd\u6570"},"content":{"rendered":"<p>Python\u7684&#8221;map()&#8221;\u51fd\u6570\u7528\u4e8e\u5bf9\u6307\u5b9a\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u6240\u6709\u5143\u7d20\u5e94\u7528\u51fd\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u6620\u5c04\u5bf9\u8c61\u3002Python\u7684\u6620\u5c04\u5bf9\u8c61\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u904d\u5386\u5176\u5143\u7d20\u3002\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u5b83\u4eec\u7684\u5de5\u5382\u51fd\u6570\u5c06\u6620\u5c04\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5e8f\u5217\u5bf9\u8c61\uff0c\u5982\u5217\u8868\u3001\u5143\u7ec4\u7b49\u3002<\/p>\n<h2>Python\u7684map()\u51fd\u6570<\/h2>\n<p>Python\u4e2dmap()\u51fd\u6570\u7684\u8bed\u6cd5\u662f\uff1a<\/p>\n<pre class=\"post-pre\"><code>map(function, iterable, ...)\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u53ef\u4ee5\u5c06\u591a\u4e2a\u53ef\u8fed\u4ee3\u53c2\u6570\u4f20\u9012\u7ed9map()\u51fd\u6570\uff0c\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6307\u5b9a\u7684\u51fd\u6570\u5fc5\u987b\u5177\u6709\u76f8\u540c\u6570\u91cf\u7684\u53c2\u6570\u3002\u8be5\u51fd\u6570\u5c06\u5e76\u884c\u5730\u5e94\u7528\u4e8e\u8fd9\u4e9b\u53ef\u8fed\u4ee3\u5143\u7d20\u3002\u6709\u591a\u4e2a\u53ef\u8fed\u4ee3\u53c2\u6570\u65f6\uff0c\u5f53\u6700\u77ed\u7684\u53ef\u8fed\u4ee3\u88ab\u8017\u5c3d\u65f6\uff0cmap\u8fed\u4ee3\u5668\u4f1a\u505c\u6b62\u3002<\/p>\n<h2>Python \u4e2d map() \u51fd\u6570\u7684\u793a\u4f8b<\/h2>\n<p>\u8ba9\u6211\u4eec\u7f16\u5199\u4e00\u4e2a\u51fd\u6570\uff0c\u7528\u4e8e\u4e0emap()\u51fd\u6570\u4e00\u8d77\u4f7f\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>def to_upper_case(s):\r\n    return str(s).upper()\r\n<\/code><\/pre>\n<p>\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u51fd\u6570\uff0c\u8fd4\u56de\u8f93\u5165\u5bf9\u8c61\u7684\u5927\u5199\u5b57\u7b26\u4e32\u8868\u793a\u3002\u6211\u8fd8\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5b9e\u7528\u51fd\u6570\u6765\u6253\u5370\u8fed\u4ee3\u5668\u5143\u7d20\u3002\u8be5\u51fd\u6570\u5c06\u4ee5\u7a7a\u683c\u6253\u5370\u8fed\u4ee3\u5668\u5143\u7d20\uff0c\u5e76\u5c06\u5728\u6240\u6709\u4ee3\u7801\u7247\u6bb5\u4e2d\u88ab\u590d\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>def print_iterator(it):\r\n    for x in it:\r\n        print(x, end=' ')\r\n    print('')  # for new line\r\n<\/code><\/pre>\n<p>\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u5728\u4e0d\u540c\u7c7b\u578b\u7684\u53ef\u8fed\u4ee3\u5bf9\u8c61\u4e0a\u4f7f\u7528map()\u51fd\u6570\u7684\u793a\u4f8b\u3002<\/p>\n<h3>\u5728Python\u4e2d\u4f7f\u7528map()\u51fd\u6570\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u5904\u7406<\/h3>\n<pre class=\"post-pre\"><code># map() with string\r\nmap_iterator = map(to_upper_case, 'abc')\r\nprint(type(map_iterator))\r\nprint_iterator(map_iterator)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a\u7528\u6c49\u8bed\u8fdb\u884c\u672c\u5730\u5316\u7684\u91ca\u4e49<\/p>\n<pre class=\"post-pre\"><code>&lt;class 'map'&gt;\r\nA B C \r\n<\/code><\/pre>\n<h3>Python\u4e2d\u7684map()\u51fd\u6570\u548c\u5143\u7ec4\u3002<\/h3>\n<pre class=\"post-pre\"><code># map() with tuple\r\nmap_iterator = map(to_upper_case, (1, 'a', 'abc'))\r\nprint_iterator(map_iterator)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>1 A ABC \r\n<\/code><\/pre>\n<h3>\u7528Python\u4e2d\u7684map()\u51fd\u6570\u4e0e\u5217\u8868\u3002<\/h3>\n<pre class=\"post-pre\"><code>map_iterator = map(to_upper_case, ['x', 'a', 'abc'])\r\nprint_iterator(map_iterator)\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>X A ABC \r\n<\/code><\/pre>\n<h2>\u5c06\u5730\u56fe\u8f6c\u6362\u4e3a\u5217\u8868\u3001\u5143\u7ec4\u3001\u96c6\u5408\u3002<\/h2>\n<p>\u7531\u4e8e\u5730\u56fe\u5bf9\u8c61\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9\u7528\u4e8e\u521b\u5efa\u5217\u8868\u3001\u5143\u7ec4\u3001\u96c6\u5408\u7b49\u7684\u5de5\u5382\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>map_iterator = map(to_upper_case, ['a', 'b', 'c'])\r\nmy_list = list(map_iterator)\r\nprint(my_list)\r\n\r\nmap_iterator = map(to_upper_case, ['a', 'b', 'c'])\r\nmy_set = set(map_iterator)\r\nprint(my_set)\r\n\r\nmap_iterator = map(to_upper_case, ['a', 'b', 'c'])\r\nmy_tuple = tuple(map_iterator)\r\nprint(my_tuple)\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>['A', 'B', 'C']\r\n{'C', 'B', 'A'}\r\n('A', 'B', 'C')\r\n<\/code><\/pre>\n<h2>\u4f7f\u7528lambda\u51fd\u6570\u7684Python map()\u51fd\u6570<\/h2>\n<p>\u5982\u679c\u6211\u4eec\u4e0d\u60f3\u91cd\u590d\u4f7f\u7528\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u5728map\uff08\uff09\u4e2d\u4f7f\u7528lambda\u51fd\u6570\u3002\u5f53\u6211\u4eec\u7684\u51fd\u6570\u5f88\u5c0f\u4e14\u4e0d\u60f3\u5b9a\u4e49\u4e00\u4e2a\u65b0\u7684\u51fd\u6570\u65f6\uff0c\u8fd9\u662f\u975e\u5e38\u6709\u7528\u7684\u3002<\/p>\n<pre class=\"post-pre\"><code>list_numbers = [1, 2, 3, 4]\r\n\r\nmap_iterator = map(lambda x: x * 2, list_numbers)\r\nprint_iterator(map_iterator)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>2 4 6 8 \r\n<\/code><\/pre>\n<h2>Python\u4e2d\u7684map()\u51fd\u6570\u53ef\u4ee5\u4f20\u5165\u591a\u4e2a\u53c2\u6570\u3002<\/h2>\n<p>\u8ba9\u6211\u4eec\u770b\u4e00\u4e2a\u4f7f\u7528map\uff08\uff09\u51fd\u6570\u548c\u591a\u4e2a\u53ef\u8fed\u4ee3\u53c2\u6570\u7684\u4f8b\u5b50\u3002<\/p>\n<pre class=\"post-pre\"><code># map() with multiple iterable arguments\r\nlist_numbers = [1, 2, 3, 4]\r\ntuple_numbers = (5, 6, 7, 8)\r\nmap_iterator = map(lambda x, y: x * y, list_numbers, tuple_numbers)\r\nprint_iterator(map_iterator)\r\n<\/code><\/pre>\n<p>\u8f93\u51fa\uff1a5 12 21 32\u8bf7\u6ce8\u610f\u6211\u4eec\u7684\u51fd\u6570\u6709\u4e24\u4e2a\u53c2\u6570\u3002\u8f93\u51fa\u7684\u6620\u5c04\u8fed\u4ee3\u5668\u662f\u5c06\u8be5\u51fd\u6570\u540c\u65f6\u5e94\u7528\u4e8e\u4e24\u4e2a\u53ef\u8fed\u4ee3\u5143\u7d20\u7684\u7ed3\u679c\u3002\u8ba9\u6211\u4eec\u770b\u770b\u5f53\u53ef\u8fed\u4ee3\u5bf9\u8c61\u5927\u5c0f\u4e0d\u540c\u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n<pre class=\"post-pre\"><code># map() with multiple iterable arguments of different sizes\r\nlist_numbers = [1, 2, 3, 4]\r\ntuple_numbers = (5, 6, 7, 8, 9, 10)\r\nmap_iterator = map(lambda x, y: x * y, list_numbers, tuple_numbers)\r\nprint_iterator(map_iterator)\r\n\r\nmap_iterator = map(lambda x, y: x * y, tuple_numbers, list_numbers)\r\nprint_iterator(map_iterator)\r\n<\/code><\/pre>\n<p>\u4ea7\u51fa\uff1a<\/p>\n<pre class=\"post-pre\"><code>5 12 21 32 \r\n5 12 21 32 \r\n<\/code><\/pre>\n<p>\u5f53\u53c2\u6570\u7684\u5927\u5c0f\u4e0d\u540c\u65f6\uff0c\u5c06\u5e94\u7528\u6620\u5c04\u51fd\u6570\u5230\u5143\u7d20\uff0c\u76f4\u5230\u5176\u4e2d\u4e00\u4e2a\u53c2\u6570\u7528\u5c3d\u3002<\/p>\n<h2>Python\u4e2d\u4f7f\u7528\u51fd\u6570None\u7684map()\u51fd\u6570<\/h2>\n<p>\u6211\u4eec\u770b\u770b\u5f53\u5c06\u51fd\u6570\u8bbe\u7f6e\u4e3a None \u65f6\u4f1a\u53d1\u751f\u4ec0\u4e48\u3002<\/p>\n<pre class=\"post-pre\"><code>map_iterator = map(None, 'abc')\r\nprint(map_iterator)\r\nfor x in map_iterator:\r\n    print(x)\r\n<\/code><\/pre>\n<p>\u7ed3\u679c\uff1a<\/p>\n<pre class=\"post-pre\"><code>Traceback (most recent call last):\r\n  File \"\/Users\/pankaj\/Documents\/github\/journaldev\/Python-3\/basic_examples\/python_map_example.py\", line 3, in &lt;module&gt;\r\n    for x in map_iterator:\r\nTypeError: 'NoneType' object is not callable\r\n<\/code><\/pre>\n<p>\u60a8\u53ef\u4ee5\u4ece\u6211\u4eec\u7684GitHub\u5b58\u50a8\u5e93\u4e2d\u67e5\u627e\u5b8c\u6574\u7684Python\u811a\u672c\u548c\u66f4\u591a\u7684Python\u793a\u4f8b\u3002<\/p>\n<p>\u53c2\u8003\uff1a\u5b98\u65b9\u6587\u6863<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python\u7684&#8221;map()&#8221;\u51fd\u6570\u7528\u4e8e\u5bf9\u6307\u5b9a\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u6240\u6709\u5143\u7d20\u5e94\u7528\u51fd\u6570\uff0c\u5e76\u8fd4\u56de\u4e00\u4e2a\u6620\u5c04 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-50731","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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