{"id":205256,"date":"2025-05-29T10:33:07","date_gmt":"2025-05-29T02:33:07","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205256\/"},"modified":"2025-05-29T10:33:07","modified_gmt":"2025-05-29T02:33:07","slug":"lambda-%e8%a1%a8%e8%be%be%e5%bc%8f%e5%87%bd%e6%95%b0%e5%b0%81%e8%a3%85%e4%b8%ad%e7%9a%84%e8%be%93%e5%87%ba%e5%b7%ae%e5%bc%82%ef%bc%9a%e5%88%97%e8%a1%a8%e4%b8%8e%e7%94%9f%e6%88%90%e5%99%a8%e6%9c%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205256\/","title":{"rendered":"Lambda \u8868\u8fbe\u5f0f\u51fd\u6570\u5c01\u88c5\u4e2d\u7684\u8f93\u51fa\u5dee\u5f02\uff1a\u5217\u8868\u4e0e\u751f\u6210\u5668\u6709\u4f55\u4e0d\u540c\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Lambda \u8868\u8fbe\u5f0f\u51fd\u6570\u5c01\u88c5\u4e2d\u7684\u8f93\u51fa\u5dee\u5f02\uff1a\u5217\u8868\u4e0e\u751f\u6210\u5668\u6709\u4f55\u4e0d\u540c\uff1f <\/h1>\n

\u5927\u5bb6\u597d\uff0c\u6211\u4eec\u53c8\u89c1\u9762\u4e86\u554a~\u672c\u6587\u7684\u5185\u5bb9\u4e2d\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u3002\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\u76f8\u5173\u77e5\u8bc6\uff0c\u6b22\u8fce\u5173\u6ce8\u6211\uff0c\u4ee5\u540e\u4f1a\u7ed9\u5927\u5bb6\u5e26\u6765\u66f4\u591a\u6587\u7ae0<\/span>\u76f8\u5173\u6587\u7ae0\uff0c\u5e0c\u671b\u6211\u4eec\u80fd\u4e00\u8d77\u8fdb\u6b65\uff01\u4e0b\u9762\u5c31\u5f00\u59cb\u672c\u6587\u7684\u6b63\u5f0f\u5185\u5bb9~<\/p>\n

<\/p>\n

\u5173\u4e8e lambda \u8868\u8fbe\u5f0f\u7684\u51fd\u6570\u5c01\u88c5\u53ca\u8f93\u51fa\u5dee\u5f02<\/strong><\/p>\n

\u4ee3\u7801\u63d0\u4f9b\u4e86\u4e24\u4e2a\u51fd\u6570 foo\uff0c\u5b83\u4eec\u8fd4\u56de\u4e0d\u540c\u7684\u533f\u540d\u51fd\u6570\u96c6\u5408\u3002<\/p>\n

\u5728\u7b2c\u4e00\u4e2a\u51fd\u6570\u4e2d\uff1a<\/p>\n

def foo():\n    return [lambda x: x + i for i in range(4)]<\/pre>\n
\u6b64\u51fd\u6570\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u5217\u8868\uff0c\u5176\u4e2d\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a\u533f\u540d\u51fd\u6570\u3002\u533f\u540d\u51fd\u6570 lambda x: x + i \u4e2d\u7684 i \u4ece range(4) \u5faa\u73af\u4e2d\u83b7\u5f97\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6b64\u65f6 i \u5df2\u6210\u4e3a 3\uff0c\u56e0\u4e3a\u5faa\u73af\u5df2\u7ecf\u6267\u884c\u5b8c\u6bd5\u3002<\/p>\n
\u56e0\u6b64\uff0c\u5f53\u5bf9\u8be5\u5217\u8868\u4e2d\u7684\u533f\u540d\u51fd\u6570\u8c03\u7528 x(3) \u65f6\uff0c\u5b83\u4eec\u59cb\u7ec8\u8fd4\u56de 6\uff0c\u56e0\u4e3a i \u5df2\u7ecf\u56fa\u5b9a\u4e3a 3\uff1a<\/p>\n
print([x(3) for x in foo()])\n# \u8f93\u51fa\uff1a [6, 6, 6, 6]<\/pre>\n
\u5728\u7b2c\u4e8c\u4e2a\u51fd\u6570\u4e2d\uff1a<\/p>\n
def foo():\n    return (lambda x: x + i for i in range(4))<\/pre>\n
\u6b64\u51fd\u6570\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u751f\u6210\u5668\uff0c\u5b83\u5305\u542b\u4e86\u4e00\u4e2a\u96c6\u5408\u7684\u533f\u540d\u51fd\u6570\u3002\u751f\u6210\u5668\u5728\u8fed\u4ee3\u65f6\u624d\u6267\u884c\u5faa\u73af\uff0c\u5206\u914d i \u7684\u503c\u3002<\/p>\n
\u56e0\u6b64\uff0c\u5f53\u8fed\u4ee3\u8be5\u751f\u6210\u5668\u5e76\u4f7f\u7528 x(3) \u8c03\u7528\u533f\u540d\u51fd\u6570\u65f6\uff0c\u5b83\u4eec\u4f1a\u52a8\u6001\u5730\u5e94\u7528 i\uff0c\u4f9d\u6b21\u8fd4\u56de 3\u30014\u30015 \u548c 6\uff1a<\/p>\n
print([x(3) for x in foo()])\n# \u8f93\u51fa\uff1a [3, 4, 5, 6]<\/pre>\n
\u7531\u6b64\u53ef\u89c1\uff0c\u5c01\u88c5\u533f\u540d\u51fd\u6570\u7684\u65b9\u5f0f\u76f4\u63a5\u5f71\u54cd\u4e86\u8f93\u51fa\u7ed3\u679c\u3002\u8fd4\u56de\u4e00\u4e2a\u51fd\u6570\u5217\u8868\u4f1a\u5c06 i \u9501\u5b9a\u4e3a\u5faa\u73af\u7684\u6700\u540e\u503c\uff0c\u800c\u8fd4\u56de\u4e00\u4e2a\u751f\u6210\u5668\u5219\u5728\u8fed\u4ee3\u65f6\u52a8\u6001\u5206\u914d i \u7684\u503c\u3002<\/p>\n
\u4eca\u5929\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u5e0c\u671b\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff1b\u5173\u4e8e\u6587\u7ae0\u7684\u6280\u672f\u77e5\u8bc6\u6211\u4eec\u4f1a\u4e00\u70b9\u70b9\u6df1\u5165\u4ecb\u7ecd\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u4e00\u8d77\u5b66\u4e60\u7f16\u7a0b~<\/p>\n","protected":false},"excerpt":{"rendered":"
Lambda \u8868\u8fbe\u5f0f\u51fd\u6570\u5c01\u88c5\u4e2d\u7684...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-205256","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205256","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=205256"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205256\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}