{"id":3152,"date":"2025-06-02T15:49:04","date_gmt":"2025-06-04T08:46:04","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=3152"},"modified":"2025-06-04T15:49:04","modified_gmt":"2025-06-04T08:46:04","slug":"%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84reduce_ex%e5%87%bd%e6%95%b8-2","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84reduce_ex%e5%87%bd%e6%95%b8-2\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3 Python \u4e2d\u7684 `reduce()` \u51fd\u6578\uff1a2025 \u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"<p><meta name=\"keywords\" content=\"Python, reduce, reduce_ex, Python \u6559\u5b78\"><\/p>\n<h1>Python `reduce()` \u51fd\u6578\u4ecb\u7d39<\/h1>\n<p>\u5728 Python \u4e2d\uff0c`reduce()` \u51fd\u6578\u662f\u7528\u65bc\u5c0d\u4e00\u500b\u53ef\u8fed\u4ee3\u7684\u5e8f\u5217\uff08\u5982 list\u3001tuple\u3001dict \u7b49\uff09\u4e2d\u7684\u5143\u7d20\u9032\u884c\u7d2f\u52a0\u6216\u5176\u4ed6\u4f5c\u7528\u7684\u5f37\u5927\u5de5\u5177\u3002\u5b83\u662f Python \u6a19\u6e96\u5eab\u4e2d\u7684\u4e00\u90e8\u5206\uff0c\u901a\u5e38\u7531 `functools` \u6a21\u7d44\u63d0\u4f9b\u3002\u4ee5\u4e0b\u662f\u5176\u8a9e\u6cd5\uff1a<\/p>\n<pre class=\"brush: python\">\nfrom functools import reduce\n\nresult = reduce(function, sequence[, initial])\n<\/pre>\n<p>&#8211; **function**\uff1a\u4e00\u500b\u51fd\u6578\uff0c\u8a72\u51fd\u6578\u63a5\u53d7\u5169\u500b\u53c3\u6578\u3002<br \/>\n&#8211; **sequence**\uff1a\u4e00\u500b\u53ef\u8fed\u4ee3\u7684\u5e8f\u5217\u3002<br \/>\n&#8211; **initial**\uff08\u53ef\u9078\uff09\uff1a\u6307\u5b9a\u7d2f\u52a0\u7684\u521d\u59cb\u503c\u3002<\/p>\n<p>\u8209\u500b\u4f8b\u5b50\u4f86\u8aaa\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b list\uff0c\u88e1\u9762\u5305\u542b\u4e86\u4e00\u4e9b\u6578\u5b57\uff1a<\/p>\n<pre class=\"brush: python\">\nnumbers = [1, 2, 3, 4, 5]\n<\/pre>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u5c07\u9019\u500b list \u4e2d\u7684\u6240\u6709\u6578\u5b57\u7d2f\u52a0\u8d77\u4f86\uff0c\u53ef\u4ee5\u4f7f\u7528 `reduce()` \u51fd\u6578\uff1a<\/p>\n<pre class=\"brush: python\">\nfrom functools import reduce\n\nsum_result = reduce(lambda x, y: x + y, numbers)\n\nprint(sum_result)  # \u8f38\u51fa\u7d50\u679c\u70ba15\n<\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 lambda \u51fd\u6578\u4f86\u5c07 list \u4e2d\u7684\u5143\u7d20\u9032\u884c\u7d2f\u52a0\uff0c\u6700\u7d42\u5f97\u5230\u7684\u7d50\u679c\u662f list \u4e2d\u6240\u6709\u5143\u7d20\u7684\u7e3d\u548c\u3002<\/p>\n<p>\u9664\u4e86\u7d2f\u52a0\uff0c`reduce()` \u51fd\u6578\u9084\u53ef\u4ee5\u7528\u65bc\u5176\u4ed6\u7684\u64cd\u4f5c\uff0c\u4f8b\u5982\u5c07 list \u4e2d\u7684\u5143\u7d20\u9032\u884c\u4e58\u7a4d\uff1a<\/p>\n<pre class=\"brush: python\">\nfrom functools import reduce\n\nproduct_result = reduce(lambda x, y: x * y, numbers)\n\nprint(product_result)  # \u8f38\u51fa\u7d50\u679c\u70ba120\n<\/pre>\n<p>\u53e6\u5916\uff0c`reduce()` \u51fd\u6578\u9084\u53ef\u4ee5\u63a5\u6536\u4e00\u500b\u53ef\u9078\u7684 `initial` \u53c3\u6578\uff0c\u5b83\u53ef\u4ee5\u6307\u5b9a\u7d2f\u52a0\u7684\u521d\u59cb\u503c\uff1a<\/p>\n<pre class=\"brush: python\">\nfrom functools import reduce\n\nsum_with_initial = reduce(lambda x, y: x + y, numbers, 10)\n\nprint(sum_with_initial)  # \u8f38\u51fa\u7d50\u679c\u70ba25\n<\/pre>\n<p>\u5728\u9019\u6bb5\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5c07 `initial` \u53c3\u6578\u8a2d\u7f6e\u70ba 10\uff0c\u9019\u6a23\u5c31\u80fd\u5c07 list \u4e2d\u7684\u5143\u7d20\u8207 10 \u9032\u884c\u7d2f\u52a0\uff0c\u6700\u7d42\u5f97\u5230\u7684\u7d50\u679c\u662f list \u4e2d\u6240\u6709\u5143\u7d20\u7684\u7e3d\u548c\u52a0\u4e0a 10\u3002<\/p>\n<p>### \u932f\u8aa4\u6392\u9664<br \/>\n1. **ImportError**\uff1a\u78ba\u4fdd\u4f60\u5df2\u7d93\u5f9e `functools` \u6a21\u7d44\u5c0e\u5165\u4e86 `reduce` \u51fd\u6578\u3002<br \/>\n2. **TypeError**\uff1a\u78ba\u8a8d\u50b3\u5165\u7684 `function` \u53c3\u6578\u662f\u53ef\u4ee5\u63a5\u53d7\u5169\u500b\u53c3\u6578\u7684\u51fd\u6578\uff0c\u5426\u5247\u6703\u5c0e\u81f4\u932f\u8aa4\u3002<\/p>\n<p>### \u5ef6\u4f38\u61c9\u7528<br \/>\n&#8211; \u4f7f\u7528 `reduce()` \u5c0d\u5b57\u5178\u9032\u884c\u7d2f\u52a0\u64cd\u4f5c\u3002<br \/>\n&#8211; \u7d50\u5408\u5176\u4ed6\u51fd\u6578\u5f0f\u7de8\u7a0b\u5de5\u5177\uff08\u5982 `map()` \u548c `filter()`\uff09\u9032\u884c\u6578\u64da\u8655\u7406\u3002<br \/>\n&#8211; \u5728\u6578\u64da\u79d1\u5b78\u4e2d\uff0c\u5229\u7528 `reduce()` \u5c0d\u5927\u578b\u6578\u64da\u96c6\u9032\u884c\u805a\u5408\u3002<\/p>\n<p>\u7e3d\u7d50\u4f86\u8aaa\uff0cPython \u7684 `reduce()` \u51fd\u6578\u53ef\u4ee5\u5c07\u4e00\u500b\u53ef\u8fed\u4ee3\u7684\u5e8f\u5217\u4e2d\u7684\u5143\u7d20\u9032\u884c\u7d2f\u52a0\uff0c\u4e26\u8fd4\u56de\u7d2f\u52a0\u7d50\u679c\uff0c\u5b83\u9084\u53ef\u4ee5\u63a5\u6536\u4e00\u500b\u53ef\u9078\u7684 `initial` \u53c3\u6578\uff0c\u7528\u65bc\u6307\u5b9a\u7d2f\u52a0\u7684\u521d\u59cb\u503c\u3002\u82e5\u60f3\u6df1\u5165\u4e86\u89e3 Python \u7684\u5176\u4ed6\u529f\u80fd\uff0c\u8acb\u53c3\u8003 [\u9019\u7bc7\u6559\u5b78\u6587\u7ae0](https:\/\/vocus.cc) \u9032\u4e00\u6b65\u63d0\u5347\u4f60\u7684 Python \u6280\u80fd\u3002<\/p>\n<p>### Q&#038;A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<br \/>\n**Q1: `reduce()` \u548c `for` \u5faa\u74b0\u6709\u4ec0\u9ebc\u5340\u5225\uff1f**<br \/>\nA1: `reduce()` \u662f\u4e00\u7a2e\u51fd\u6578\u5f0f\u7de8\u7a0b\u7684\u65b9\u6cd5\uff0c\u901a\u5e38\u66f4\u7c21\u6f54\uff0c\u9069\u5408\u65bc\u5c0d\u5e8f\u5217\u9032\u884c\u805a\u5408\u64cd\u4f5c\u3002\u800c `for` \u5faa\u74b0\u5247\u66f4\u76f4\u89c0\uff0c\u5c0d\u65bc\u8907\u96dc\u7684\u908f\u8f2f\u64cd\u4f5c\u4f86\u8aaa\uff0c\u53ef\u80fd\u66f4\u52a0\u6e05\u6670\u53ef\u8b80\u3002<\/p>\n<p>**Q2: `reduce()` \u53ef\u4ee5\u7528\u65bc\u5b57\u7b26\u4e32\u55ce\uff1f**<br \/>\nA2: \u662f\u7684\uff0c`reduce()` \u53ef\u4ee5\u7528\u65bc\u5b57\u7b26\u4e32\u7684\u62fc\u63a5\u6216\u5176\u4ed6\u64cd\u4f5c\uff0c\u53ea\u9700\u78ba\u4fdd\u50b3\u5165\u7684\u51fd\u6578\u80fd\u5920\u6b63\u78ba\u8655\u7406\u5b57\u7b26\u4e32\u3002<\/p>\n<p>**Q3: \u4f7f\u7528 `reduce()` \u6703\u5f71\u97ff\u6027\u80fd\u55ce\uff1f**<br \/>\nA3: \u5728\u8655\u7406\u5c0f\u6578\u64da\u96c6\u6642\uff0c`reduce()` \u6027\u80fd\u8868\u73fe\u826f\u597d\uff1b\u4f46\u5728\u5927\u578b\u6578\u64da\u96c6\u4e0a\uff0c\u53ef\u80fd\u6703\u56e0\u70ba\u591a\u6b21\u51fd\u6578\u8abf\u7528\u800c\u5f71\u97ff\u6027\u80fd\uff0c\u9019\u6642\u53ef\u4ee5\u8003\u616e\u5176\u4ed6\u805a\u5408\u65b9\u6cd5\uff0c\u5982 NumPy \u7684\u805a\u5408\u51fd\u6578\u3002<\/p>\n<p>&#8212;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Python\u4e2d\u7684reduce_ex()\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u5c07\u4e00\u500b\u5e8f\u5217\u7684\u5143\u7d20\u9032\u884c\u7d2f\u52a0\u6216\u7d2f\u4e58\uff0c\u4e26\u8fd4\u56de\u4e00\u500b\u55ae\u4e00\u7684\u503c\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39reduce_ex()\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5b83\u7684\u512a\u9ede\u548c\u7f3a\u9ede\u3002<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[18],"tags":[15],"class_list":["post-3152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","tag-python"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/badgameshow.com\/steven\/wp-content\/uploads\/2022\/12\/DALL\u00b7E-2022-12-28-14.25.55-\u62f7\u8c9d2.png","jetpack-related-posts":[],"jetpack_shortlink":"https:\/\/wp.me\/pcFK27-OQ","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3152","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/comments?post=3152"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3152\/revisions"}],"predecessor-version":[{"id":3153,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3152\/revisions\/3153"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media\/2518"}],"wp:attachment":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/media?parent=3152"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3152"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3152"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}