Map<\/span><\/strong><\/span>
\nMap\u4f1a\u5c06\u4e00\u4e2a\u51fd\u6570\u6620\u5c04\u5230\u4e00\u4e2a\u8f93\u5165\u5217\u8868\u7684\u6240\u6709\u5143\u7d20\u4e0a\u3002\u8fd9\u662f\u5b83\u7684\u89c4\u8303\uff1a<\/p>\n

\u89c4\u8303<\/strong>
\nmap(function_to_apply, list_of_inputs)
\n\u5927\u591a\u6570\u65f6\u5019\uff0c\u6211\u4eec\u8981\u628a\u5217\u8868\u4e2d\u6240\u6709\u5143\u7d20\u4e00\u4e2a\u4e2a\u5730\u4f20\u9012\u7ed9\u4e00\u4e2a\u51fd\u6570\uff0c\u5e76\u6536\u96c6\u8f93\u51fa\u3002\u6bd4\u65b9\u8bf4\uff1a<\/p>\n

\n
Code: <\/strong>[\u5168\u9009]<\/a> [Expand\/Collapse]<\/a><\/div>\n
\n
\n
\n
\n
\n
items =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>]<\/span><\/div>\n<\/li>\n
\n
squared =<\/span> [<\/span>]<\/span><\/div>\n<\/li>\n
\n
for<\/span> i in<\/span> items:<\/div>\n<\/li>\n
\n
squared.append<\/span>(<\/span>i**2<\/span>)<\/span><\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n
GeSHi © Codebox Plus Extension<\/div>\n<\/div>\n
Map\u53ef\u4ee5\u8ba9\u6211\u4eec\u7528\u4e00\u79cd\u7b80\u5355\u800c\u6f02\u4eae\u5f97\u591a\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u3002\u5c31\u662f\u8fd9\u6837\uff1a<\/p>\n
\n
Code: <\/strong>[\u5168\u9009]<\/a> [Expand\/Collapse]<\/a><\/div>\n
\n
\n
\n
\n
\n
items =<\/span> [<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>]<\/span><\/div>\n<\/li>\n
\n
squared =<\/span> list<\/span>(<\/span>map<\/span>(<\/span>lambda<\/span> x: x**2<\/span>,<\/span> items)<\/span>)<\/span><\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n
GeSHi © Codebox Plus Extension<\/div>\n<\/div>\n
\u5927\u591a\u6570\u65f6\u5019\uff0c\u6211\u4eec\u4f7f\u7528\u533f\u540d\u51fd\u6570(lambdas)\u6765\u914d\u5408map, \u6240\u4ee5\u6211\u5728\u4e0a\u9762\u4e5f\u662f\u8fd9\u4e48\u505a\u7684\u3002 \u4e0d\u4ec5\u7528\u4e8e\u4e00\u5217\u8868\u7684\u8f93\u5165\uff0c \u6211\u4eec\u751a\u81f3\u53ef\u4ee5\u7528\u4e8e\u4e00\u5217\u8868\u7684\u51fd\u6570\uff01<\/p>\n
\n
Code: <\/strong>[\u5168\u9009]<\/a> [Expand\/Collapse]<\/a><\/div>\n
\n
\n
\n
\n
\n
def<\/span> multiply(<\/span>x)<\/span>:<\/div>\n<\/li>\n
\n
return<\/span> (<\/span>x*x)<\/span><\/div>\n<\/li>\n
\n
def<\/span> add(<\/span>x)<\/span>:<\/div>\n<\/li>\n
\n
return<\/span> (<\/span>x+x)<\/span><\/div>\n<\/li>\n
\n
<\/div>\n<\/li>\n
\n
funcs =<\/span> [<\/span>multiply,<\/span> add]<\/span><\/div>\n<\/li>\n
\n
for<\/span> i in<\/span> range<\/span>(<\/span>5<\/span>)<\/span>:<\/div>\n<\/li>\n
\n
value =<\/span> map<\/span>(<\/span>lambda<\/span> x: x(<\/span>i)<\/span>,<\/span> funcs)<\/span><\/div>\n<\/li>\n
\n
print<\/span>(<\/span>list<\/span>(<\/span>value)<\/span>)<\/span><\/div>\n<\/li>\n
\n
# \u8bd1\u8005\u6ce8\uff1a\u4e0a\u9762print\u65f6\uff0c\u52a0\u4e86list\u8f6c\u6362\uff0c\u662f\u4e3a\u4e86python2\/3\u7684\u517c\u5bb9\u6027<\/span><\/div>\n<\/li>\n
\n
# \u5728python2\u4e2dmap\u76f4\u63a5\u8fd4\u56de\u5217\u8868\uff0c\u4f46\u5728python3\u4e2d\u8fd4\u56de\u8fed\u4ee3\u5668<\/span><\/div>\n<\/li>\n
\n
# \u56e0\u6b64\u4e3a\u4e86\u517c\u5bb9python3, \u9700\u8981list\u8f6c\u6362\u4e00\u4e0b<\/span><\/div>\n<\/li>\n
\n
<\/div>\n<\/li>\n
\n
# Output:<\/span><\/div>\n<\/li>\n
\n
# [0, 0]<\/span><\/div>\n<\/li>\n
\n
# [1, 2]<\/span><\/div>\n<\/li>\n
\n
# [4, 4]<\/span><\/div>\n<\/li>\n
\n
# [9, 6]<\/span><\/div>\n<\/li>\n
\n
# [16, 8]<\/span><\/div>\n<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n
GeSHi © Codebox Plus Extension<\/div>\n<\/div>\n
\u539f\u6587\u4f5c\u8005: BG6RSH | \u67e5\u770b\u539f\u5e16<\/a><\/small><\/p>\n","protected":false},"excerpt":{"rendered":"
Map Map\u4f1a\u5c06\u4e00\u4e2a\u51fd\u6570\u6620\u5c04\u5230\u4e00\u4e2a\u8f93\u5165\u5217\u8868\u7684\u6240\u6709\u5143\u7d20\u4e0a\u3002\u8fd9\u662f\u5b83\u7684\u89c4\u8303\uff1a \u89c4\u8303 … \u7ee7\u7eed\u9605\u8bfb →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[105],"tags":[],"class_list":["post-1468","post","type-post","status-publish","format-standard","hentry","category-105"],"_links":{"self":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1468","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1468"}],"version-history":[{"count":0,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=\/wp\/v2\/posts\/1468\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1468"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1468"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tansoo.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1468"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}