{"id":168027,"date":"2023-07-28T16:53:03","date_gmt":"2023-07-28T08:53:03","guid":{"rendered":"http:\/\/www.idc.net\/help\/168027\/"},"modified":"2023-07-28T16:53:03","modified_gmt":"2023-07-28T08:53:03","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91python%e6%95%99%e7%a8%8b%ef%bc%9apython%e4%b8%ad%e5%b0%91%e8%a7%81%e7%9a%84%e5%87%bd%e6%95%b0map%e5%92%8cpartial","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/168027\/","title":{"rendered":"\u540e\u6d6a\u4e91Python\u6559\u7a0b\uff1apython\u4e2d\u5c11\u89c1\u7684\u51fd\u6570map()\u548cpartial()"},"content":{"rendered":"<p>map()\u662fpython\u7684\u4e00\u4e2a\u5185\u5efa\u51fd\u6570\uff0c \u4ed6\u80fd\u591f\u901a\u8fc7\u51fd\u6570\u6765\u5904\u7406\u5e8f\u5217\uff0c\u6bd4\u5982\uff0c\u6211\u4eec\u76f8\u5173\u4e00\u4e2a\u6570\u7ec4[0\uff0c1\uff0c2\uff0c3\uff0c4\uff0c5]\u6240\u6709\u7684\u6570\u5b57\u90fd+2 , \u5f53\u7136\uff0c\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u505a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/oss.py.cn\/pycn\/upload\/article\/000\/000\/002\/5cf0d33a53dc0980.jpg\" class=\"aligncenter\"><\/p>\n<pre>old&nbsp;=&nbsp;[0,1,2,3,4,5]\nnew&nbsp;=&nbsp;[]\nfor&nbsp;item&nbsp;in&nbsp;old:\n&nbsp;&nbsp;&nbsp;&nbsp;new.append(item+2)\nprint&nbsp;new<\/pre>\n<p>\u6709\u70b9\u5c0f\u9898\u5927\u505a\u7684\u611f\u89c9\uff0cmap\u5c31\u662f\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684<\/p>\n<pre>old&nbsp;=&nbsp;[0,1,2,3,4,5]\nnew&nbsp;=&nbsp;map((lambda&nbsp;x:x+2),old)\nprint&nbsp;new<\/pre>\n<p>map \u53ef\u4ee5\u628a\u8fd9\u4e2a\u67d0\u4e2a\u51fd\u6570\u5e94\u7528\u5230\u5e8f\u5217\u4e2d\u7684\u6bcf\u4e2a\u503c\uff0c\u7136\u540e\u76f4\u63a5\u8fd4\u56de\u4e00\u4e2a\u5904\u7406\u540e\u7684\u7ed3\u679c,\u4f8b\u5982\uff1a<\/p>\n<pre>[x**2&nbsp;for&nbsp;x&nbsp;in&nbsp;range(6)]\n[x+2&nbsp;for&nbsp;x&nbsp;in&nbsp;range(6)]<\/pre>\n<p>partial()\u51fd\u6570\u662f\u53e6\u5916\u4e00\u4e2apython\u7684\u5185\u5efa\u51fd\u6570 \uff0c\u8fd9\u4e2a\u7684\u5185\u5efa\u51fd\u6570\u5176\u5b9e\u662f\u975e\u5e38\u597d\u7528\u7684\uff0c\u6bd4\u5982\u6211\u4eec\u5e38\u7528\u7684\u51fd\u6570add(), \u6211\u4eec\u53ef\u4ee5\u628a\u67d0\u4e2a\u6570+100 \uff0c\u4e5f\u53ef\u4ee5\u628a\u67d0\u4e2a\u6570\u5b57+1<\/p>\n<pre>add(1,x)&nbsp;,&nbsp;add(100,x)<\/pre>\n<p>\u800c\u8fd9\u4e2apartial\u51fd\u6570\u8ba9\u6211\u4eec\u53ef\u4ee5\u8fd9\u4e48\u6765\u4f7f\u7528<\/p>\n<pre>add1(x)&nbsp;,add100(x)<\/pre>\n<p>\u8fd9\u6837\uff0c\u4ece\u51fd\u6570\u540d\u79f0\u6211\u4eec\u5c31\u77e5\u9053\u52a0\u4e86\u591a\u5c11\u4e86\uff08\u8fd9\u4e2aadd\u51fd\u6570\u5c31\u662f\u4e2a\u4f8b\u5b50\u54c8\uff0c\u5e73\u65f6\u771f\u6ca1\u5fc5\u8981\uff09<\/p>\n<pre>add1&nbsp;=&nbsp;partial(add,1)\nadd100&nbsp;=&nbsp;partial(add,100)<\/pre>\n<p>\u8fd9\u4e2a\u65f6\u5019<\/p>\n<pre>add1(x)&nbsp;=&nbsp;add(1,x)\nadd100(x)&nbsp;=&nbsp;add(100,x)<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>map()\u662fpython\u7684\u4e00\u4e2a\u5185\u5efa\u51fd\u6570\uff0c \u4ed6\u80fd\u591f\u901a\u8fc7\u51fd\u6570\u6765\u5904\u7406\u5e8f\u5217\uff0c\u6bd4\u5982\uff0c\u6211\u4eec\u76f8\u5173\u4e00\u4e2a\u6570\u7ec4[0\uff0c1\uff0c2\uff0c3\uff0c4 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":168028,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[182397],"tags":[],"class_list":["post-168027","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/168027","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=168027"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/168027\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media\/168028"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=168027"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=168027"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=168027"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}