<\/p>\n
Python \u7684 `reduce()` \u51fd\u6578\u662f\u4e00\u500b\u529f\u80fd\u5f37\u5927\u7684\u5de5\u5177\uff0c\u7528\u65bc\u5c0d\u4e00\u500b\u53ef\u8fed\u4ee3\u5c0d\u8c61\uff08\u5982\u5217\u8868\uff09\u4e2d\u7684\u5143\u7d20\u9032\u884c\u7d2f\u7a4d\u8a08\u7b97\u3002\u96a8\u8457 Python \u8a9e\u8a00\u7684\u6f14\u9032\uff0c\u4e86\u89e3\u5176\u6700\u4f73\u5be6\u8e10\u548c\u6700\u65b0\u8a9e\u6cd5\u8b8a\u5f97\u5c24\u70ba\u91cd\u8981\u3002\u5728\u9019\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u5c07\u6df1\u5165\u63a2\u8a0e `reduce()` \u51fd\u6578\u7684\u7528\u6cd5\uff0c\u4e26\u63d0\u4f9b\u5be6\u4f5c\u7bc4\u4f8b\u3001\u932f\u8aa4\u6392\u9664\u5efa\u8b70\u53ca\u5ef6\u4f38\u61c9\u7528\u3002<\/p>\n
## `reduce()` \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5<\/p>\n
`reduce()` \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n
“`python
\nfrom functools import reduce<\/p>\n
reduce(function, iterable[, initial])
\n“`<\/p>\n
– **function**: \u4e00\u500b\u63a5\u53d7\u5169\u500b\u53c3\u6578\u7684\u51fd\u5f0f\uff0c\u5c07\u7528\u4f86\u7d2f\u7a4d\u8a08\u7b97\u3002
\n– **iterable**: \u4e00\u500b\u53ef\u8fed\u4ee3\u7684\u5c0d\u8c61\uff08\u5982\u5217\u8868\uff09\u3002
\n– **initial**: \u53ef\u9078\u53c3\u6578\uff0c\u82e5\u63d0\u4f9b\uff0c\u5247\u5c07\u4f5c\u70ba\u521d\u59cb\u503c\u3002<\/p>\n
## \u5be6\u4f5c\u7bc4\u4f8b<\/p>\n
### 1. \u8a08\u7b97\u5217\u8868\u5143\u7d20\u7684\u7e3d\u548c<\/p>\n
\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u5217\u8868\uff0c\u88e1\u9762\u5305\u542b\u4e86\u4e00\u4e9b\u6578\u5b57\uff1a<\/p>\n
“`python
\nmy_list = [1, 2, 3, 4, 5]\n“`<\/p>\n
\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 `reduce()` \u51fd\u6578\u5c07\u9019\u500b\u5217\u8868\u4e2d\u7684\u5143\u7d20\u76f8\u52a0\uff1a<\/p>\n
“`python
\nfrom functools import reduce<\/p>\n
sum_result = reduce(lambda x, y: x + y, my_list)<\/p>\n
print(sum_result) # 15
\n“`<\/p>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u4f7f\u7528\u4e86 `lambda` \u51fd\u5f0f\u4f86\u5c07\u5217\u8868\u4e2d\u7684\u5143\u7d20\u76f8\u52a0\uff0c\u4e26\u5c07\u7d50\u679c\u5b58\u5132\u5728 `sum_result` \u8b8a\u6578\u4e2d\u3002<\/p>\n
### 2. \u8a08\u7b97\u5217\u8868\u5143\u7d20\u7684\u4e58\u7a4d<\/p>\n
\u540c\u7406\uff0c\u6211\u5011\u4e5f\u53ef\u4ee5\u4f7f\u7528 `reduce()` \u51fd\u6578\u5c07\u5217\u8868\u4e2d\u7684\u5143\u7d20\u76f8\u4e58\uff1a<\/p>\n
“`python
\nproduct_result = reduce(lambda x, y: x * y, my_list)<\/p>\n
print(product_result) # 120
\n“`<\/p>\n
### 3. \u627e\u51fa\u5217\u8868\u4e2d\u7684\u6700\u5927\u503c<\/p>\n
\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528 `reduce()` \u51fd\u6578\u4f86\u627e\u51fa\u5217\u8868\u4e2d\u7684\u6700\u5927\u503c\uff1a<\/p>\n
“`python
\nmax_num = reduce(lambda x, y: x if x > y else y, my_list)<\/p>\n
print(max_num) # 5
\n“`<\/p>\n
## \u932f\u8aa4\u6392\u9664<\/p>\n
\u5728\u4f7f\u7528 `reduce()` \u51fd\u6578\u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u4ee5\u4e0b\u5e38\u898b\u932f\u8aa4\uff1a<\/p>\n
1. **TypeError**: \u5982\u679c `function` \u63a5\u53d7\u7684\u53c3\u6578\u6578\u91cf\u4e0d\u6b63\u78ba\uff0c\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002\u78ba\u4fdd\u50b3\u5165\u7684\u51fd\u5f0f\u63a5\u53d7\u5169\u500b\u53c3\u6578\u3002<\/p>\n
2. **ValueError**: \u5982\u679c `iterable` \u70ba\u7a7a\u4e14\u672a\u63d0\u4f9b `initial`\uff0c\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002\u70ba\u907f\u514d\u6b64\u932f\u8aa4\uff0c\u5efa\u8b70\u59cb\u7d42\u63d0\u4f9b `initial` \u503c\u3002<\/p>\n
## \u5ef6\u4f38\u61c9\u7528<\/p>\n
`reduce()` \u51fd\u6578\u53ef\u7528\u65bc\u5404\u7a2e\u60c5\u6cc1\uff0c\u4f8b\u5982\u8655\u7406\u6578\u64da\u6d41\u3001\u5be6\u73fe\u8907\u96dc\u7684\u8a08\u7b97\u908f\u8f2f\u7b49\u7b49\u3002\u5c0d\u65bc\u9700\u8981\u591a\u6b21\u7d2f\u7a4d\u8a08\u7b97\u7684\u60c5\u6cc1\uff0c`reduce()` \u662f\u4e00\u500b\u7406\u60f3\u7684\u9078\u64c7\u3002<\/p>\n
\u5982\u9700\u66f4\u6df1\u5165\u4e86\u89e3 Python \u7684\u5404\u7a2e\u51fd\u6578\uff0c\u5efa\u8b70\u53c3\u95b1 [\u9019\u88e1](https:\/\/vocus.cc\/article\/5e88f68ffd89780001fbd5b3)\u3002<\/p>\n
## \u7d50\u8ad6<\/p>\n
\u7e3d\u4e4b\uff0cPython \u7684 `reduce()` \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u80fd\u5920\u6709\u6548\u5730\u5c0d\u5217\u8868\u4e2d\u7684\u5143\u7d20\u9032\u884c\u8a08\u7b97\u8207\u5206\u6790\u3002\u638c\u63e1\u5176\u4f7f\u7528\u65b9\u6cd5\u5c07\u5e6b\u52a9\u60a8\u66f4\u5feb\u901f\u5730\u5b8c\u6210\u8907\u96dc\u7684\u8a08\u7b97\u4efb\u52d9\u3002<\/p>\n
## Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/p>\n
**Q1: `reduce()` \u51fd\u6578\u662f\u5426\u53ef\u4ee5\u7528\u65bc\u5b57\u5178\uff1f**
\nA1: \u662f\u7684\uff0c\u60a8\u53ef\u4ee5\u5c0d\u5b57\u5178\u7684\u503c\u9032\u884c\u7d2f\u7a4d\u8a08\u7b97\uff0c\u4f46\u9700\u8981\u4f7f\u7528 `dict.values()` \u6216\u5176\u4ed6\u65b9\u6cd5\u63d0\u53d6\u503c\u3002<\/p>\n
**Q2: \u5982\u4f55\u5728 `reduce()` \u4e2d\u4f7f\u7528\u81ea\u5b9a\u7fa9\u51fd\u5f0f\uff1f**
\nA2: \u60a8\u53ef\u4ee5\u5b9a\u7fa9\u4e00\u500b\u666e\u901a\u51fd\u5f0f\u4e26\u50b3\u905e\u7d66 `reduce()`\uff0c\u5982\uff1a
\n“`python
\ndef add(x, y):
\n return x + y<\/p>\n
sum_result = reduce(add, my_list)
\n“`<\/p>\n
**Q3: `reduce()` \u8207\u5176\u4ed6\u5167\u5efa\u51fd\u6578\uff08\u5982 `map()` \u548c `filter()`\uff09\u7684\u5340\u5225\u662f\u4ec0\u9ebc\uff1f**
\nA3: `reduce()` \u5c0d\u53ef\u8fed\u4ee3\u5c0d\u8c61\u9032\u884c\u7d2f\u7a4d\u8a08\u7b97\uff0c\u800c `map()` \u7528\u65bc\u5c07\u51fd\u5f0f\u61c9\u7528\u65bc\u53ef\u8fed\u4ee3\u5c0d\u8c61\u7684\u6bcf\u500b\u5143\u7d20\uff0c`filter()` \u7528\u65bc\u904e\u6ffe\u53ef\u8fed\u4ee3\u5c0d\u8c61\u4e2d\u7684\u5143\u7d20\u3002<\/p>\n
—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3Python\u4e2d\u7684Reduce()\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u5c07\u4e00\u500b\u5217\u8868\u4e2d\u7684\u5143\u7d20\u9032\u884c\u7d2f\u52a0\u6216\u7d2f\u4e58\uff0c\u4e26\u5c07\u7d50\u679c\u8fd4\u56de\u7d66\u7528\u6236\u3002Reduce()\u51fd\u6578\u53ef\u4ee5\u6e1b\u5c11\u7a0b\u5e8f\u7684\u7a0b\u5f0f\u78bc\u91cf\uff0c\u4e26\u63d0\u9ad8\u7a0b\u5e8f\u7684\u6548\u7387\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-3354","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-S6","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3354","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=3354"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3354\/revisions"}],"predecessor-version":[{"id":3355,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3354\/revisions\/3355"}],"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=3354"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3354"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3354"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}