{"id":3204,"date":"2025-05-31T15:53:16","date_gmt":"2025-06-04T08:36:15","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=3204"},"modified":"2025-06-04T15:53:16","modified_gmt":"2025-06-04T08:36:15","slug":"%e4%ba%86%e8%a7%a3python%e7%9a%84filter%e5%87%bd%e6%95%b8%ef%bc%9a%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e5%ae%83%e4%be%86%e7%af%a9%e9%81%b8%e8%b3%87%e6%96%99%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e7%9a%84filter%e5%87%bd%e6%95%b8%ef%bc%9a%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8%e5%ae%83%e4%be%86%e7%af%a9%e9%81%b8%e8%b3%87%e6%96%99%ef%bc%9f\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3 Python \u7684 filter() \u51fd\u6578\uff1a\u5feb\u901f\u7be9\u9078\u8cc7\u6599\u7684\u6700\u4f73\u5be6\u8e10\uff082025 \u6700\u65b0\uff09"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u4e86\u89e3 Python \u7684 filter() \u51fd\u6578<\/h1>\n

Python \u7684 `filter()` \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u8b93\u958b\u767c\u8005\u8f15\u9b06\u5730\u5f9e\u8cc7\u6599\u5e8f\u5217\u4e2d\u7be9\u9078\u51fa\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u5143\u7d20\uff0c\u800c\u7121\u9700\u624b\u52d5\u7de8\u5beb\u8ff4\u5708\u9032\u884c\u8655\u7406\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u4ecb\u7d39 `filter()` \u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\u3001\u5be6\u4f5c\u7bc4\u4f8b\u53ca\u5e38\u898b\u932f\u8aa4\u6392\u9664\uff0c\u5e6b\u52a9\u4f60\u57282025\u5e74\u638c\u63e1\u9019\u9805\u91cd\u8981\u6280\u80fd\u3002<\/p>\n

### filter() \u51fd\u6578\u7684\u8a9e\u6cd5<\/p>\n

`filter()` \u51fd\u6578\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

“`python
\nfilter(function, iterable)
\n“`<\/p>\n

– **function**\uff1a\u4e00\u500b\u51fd\u6578\uff0c\u63a5\u53d7\u4e00\u500b\u53c3\u6578\u4e26\u8fd4\u56de\u5e03\u6797\u503c\uff08True \u6216 False\uff09\u3002
\n– **iterable**\uff1a\u4e00\u500b\u53ef\u8fed\u4ee3\u7684\u8cc7\u6599\u5e8f\u5217\uff0c\u4f8b\u5982 list\u3001tuple\u3001dict \u7b49\u3002<\/p>\n

`filter()` \u51fd\u6578\u6703\u5c07 `iterable` \u4e2d\u7684\u6bcf\u4e00\u500b\u5143\u7d20\u50b3\u5165 `function` \u4e2d\u9032\u884c\u6e2c\u8a66\uff0c\u82e5 `function` \u56de\u50b3 True\uff0c\u8a72\u5143\u7d20\u5c07\u88ab\u4fdd\u7559\uff1b\u53cd\u4e4b\uff0c\u5247\u88ab\u904e\u6ffe\u6389\u3002\u6700\u7d42\uff0c`filter()` \u51fd\u6578\u6703\u8fd4\u56de\u4e00\u500b\u5305\u542b\u6240\u6709\u7b26\u5408\u689d\u4ef6\u5143\u7d20\u7684\u8cc7\u6599\u5e8f\u5217\u3002<\/p>\n

### Python filter() \u51fd\u6578\u7bc4\u4f8b<\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 `filter()` \u51fd\u6578\u904e\u6ffe\u51fa\u5076\u6578\u7684\u7c21\u55ae\u7bc4\u4f8b\uff1a<\/p>\n

“`python
\ndef is_even(x):
\n return x % 2 == 0<\/p>\n

nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n

even_nums = list(filter(is_even, nums))<\/p>\n

print(even_nums)
\n“`<\/p>\n

**\u57f7\u884c\u7d50\u679c**\uff1a<\/p>\n

“`python
\n[2, 4, 6, 8, 10]\n“`<\/p>\n

\u9019\u6bb5\u7a0b\u5f0f\u78bc\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528 `filter()` \u51fd\u6578\u4f86\u7be9\u9078\u51fa `nums` \u4e2d\u7684\u5076\u6578\uff0c\u4e26\u5c07\u7d50\u679c\u5b58\u5165 `even_nums` \u5217\u8868\u4e2d\u3002<\/p>\n

### Python filter() \u51fd\u6578\u7684\u5ef6\u4f38\u61c9\u7528<\/p>\n

`filter()` \u51fd\u6578\u975e\u5e38\u9748\u6d3b\uff0c\u9664\u4e86\u53ef\u4ee5\u7528\u4f86\u904e\u6ffe\u6578\u5b57\uff0c\u9084\u53ef\u4ee5\u7528\u4f86\u904e\u6ffe\u5b57\u4e32\u7b49\u5176\u4ed6\u8cc7\u6599\u985e\u578b\u3002\u4ee5\u4e0b\u662f\u904e\u6ffe\u5b57\u4e32\u7684\u7bc4\u4f8b\uff1a<\/p>\n

“`python
\ndef is_string(x):
\n return isinstance(x, str)<\/p>\n

data = [1, ‘a’, 2, ‘b’, 3, ‘c’]\n

strings = list(filter(is_string, data))<\/p>\n

print(strings)
\n“`<\/p>\n

**\u57f7\u884c\u7d50\u679c**\uff1a<\/p>\n

“`python
\n[‘a’, ‘b’, ‘c’]\n“`<\/p>\n

\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 `filter()` \u51fd\u6578\u4f86\u7be9\u9078 `data` \u4e2d\u7684\u5b57\u4e32\uff0c\u7d50\u679c\u56de\u50b3\u4e86\u4e00\u500b\u5305\u542b\u6240\u6709\u5b57\u4e32\u7684\u5217\u8868 `strings`\u3002<\/p>\n

### \u5e38\u898b\u932f\u8aa4\u53ca\u6392\u9664<\/p>\n

1. **\u51fd\u6578\u672a\u8fd4\u56de\u5e03\u6797\u503c**\uff1a\u78ba\u4fdd\u50b3\u5165\u7684\u51fd\u6578\u8fd4\u56de\u503c\u662f\u5e03\u6797\u578b\u5225\uff08True \u6216 False\uff09\uff0c\u5426\u5247 `filter()` \u5c07\u4e0d\u6703\u5de5\u4f5c\u3002<\/p>\n

2. **\u50b3\u5165\u7684\u53c3\u6578\u4e0d\u6b63\u78ba**\uff1a\u6aa2\u67e5 `iterable` \u662f\u5426\u70ba\u53ef\u8fed\u4ee3\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u5426\u5247\u6703\u5f15\u767c\u932f\u8aa4\u3002<\/p>\n

3. **\u5fd8\u8a18\u5c07\u7d50\u679c\u8f49\u63db\u70ba\u5217\u8868**\uff1a`filter()` \u51fd\u6578\u8fd4\u56de\u4e00\u500b\u8fed\u4ee3\u5668\uff0c\u9700\u4f7f\u7528 `list()` \u51fd\u6578\u5c07\u5176\u8f49\u63db\u70ba\u5217\u8868\u4ee5\u4fbf\u67e5\u770b\u3002<\/p>\n

### \u7e3d\u7d50<\/p>\n

\u672c\u6587\u4ecb\u7d39\u4e86 Python \u7684 `filter()` \u51fd\u6578\uff0c\u9019\u662f\u4e00\u500b\u9ad8\u6548\u7684\u8cc7\u6599\u7be9\u9078\u5de5\u5177\uff0c\u80fd\u8b93\u4f60\u5feb\u901f\u7372\u5f97\u6240\u9700\u8cc7\u6599\uff0c\u800c\u7121\u9700\u7de8\u5beb\u7e41\u7463\u7684\u8ff4\u5708\u3002\u7121\u8ad6\u662f\u8655\u7406\u6578\u5b57\u3001\u5b57\u4e32\uff0c\u9084\u662f\u66f4\u8907\u96dc\u7684\u8cc7\u6599\u985e\u578b\uff0c`filter()` \u51fd\u6578\u90fd\u80fd\u5e6b\u52a9\u4f60\u63d0\u5347\u7a0b\u5f0f\u78bc\u7684\u53ef\u8b80\u6027\u548c\u57f7\u884c\u6548\u7387\u3002<\/p>\n

\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3 Python \u7684\u5176\u4ed6\u9ad8\u7d1a\u529f\u80fd\uff0c\u6b61\u8fce\u53c3\u8003\u6211\u5011\u7684 [Python \u6559\u5b78\u8cc7\u6e90](https:\/\/vocus.cc)\uff01<\/p>\n

### Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/p>\n

**Q1: filter() \u51fd\u6578\u53ef\u4ee5\u8207 lambda \u8868\u9054\u5f0f\u4e00\u8d77\u4f7f\u7528\u55ce\uff1f**
\nA1: \u662f\u7684\uff0c`filter()` \u51fd\u6578\u53ef\u4ee5\u63a5\u53d7 lambda \u8868\u9054\u5f0f\u4f5c\u70ba\u5176\u7b2c\u4e00\u500b\u53c3\u6578\uff0c\u9019\u6a23\u53ef\u4ee5\u66f4\u65b9\u4fbf\u5730\u9032\u884c\u7be9\u9078\u3002\u4f8b\u5982\uff1a`list(filter(lambda x: x % 2 == 0, nums))`\u3002<\/p>\n

**Q2: filter() \u51fd\u6578\u548c\u5217\u8868\u63a8\u5c0e\u5f0f\u6709\u4ec0\u9ebc\u5340\u5225\uff1f**
\nA2: `filter()` \u51fd\u6578\u4f7f\u7528\u4e00\u500b\u51fd\u6578\u4f86\u7be9\u9078\u8cc7\u6599\uff0c\u800c\u5217\u8868\u63a8\u5c0e\u5f0f\u5247\u662f\u76f4\u63a5\u5728\u4e00\u884c\u4e2d\u9032\u884c\u7be9\u9078\u548c\u5275\u5efa\u5217\u8868\u3002\u9078\u64c7\u4f7f\u7528\u54ea\u7a2e\u65b9\u5f0f\u53d6\u6c7a\u65bc\u500b\u4eba\u7684\u7de8\u7a0b\u98a8\u683c\u548c\u9700\u6c42\u3002<\/p>\n

**Q3: filter() \u51fd\u6578\u53ef\u4ee5\u8655\u7406\u5b57\u5178\u55ce\uff1f**
\nA3: \u662f\u7684\uff0c`filter()` \u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u5b57\u5178\uff0c\u4f46\u9700\u6ce8\u610f\u5176\u884c\u70ba\u3002\u5c0d\u65bc\u5b57\u5178\uff0c\u5b83\u6703\u904d\u6b77\u5b57\u5178\u7684\u9375\uff0c\u5982\u679c\u9700\u8981\u904e\u6ffe\u5b57\u5178\u7684\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528 `filter()` \u4f86\u64cd\u4f5c\u5b57\u5178\u7684 `.values()` \u65b9\u6cd5\u3002<\/p>\n

—<\/p>\n","protected":false},"excerpt":{"rendered":"

\u4e86\u89e3Python\u7684Filter()\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u5e6b\u52a9\u4f60\u7be9\u9078\u51fa\u4f60\u60f3\u8981\u7684\u8cc7\u6599\uff0c\u8b93\u4f60\u53ef\u4ee5\u66f4\u6709\u6548\u7387\u5730\u8655\u7406\u8cc7\u6599\u3002\u672c\u6587\u5c07\u4ecb\u7d39Filter()\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5b83\u4f86\u7be9\u9078\u8cc7\u6599\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-3204","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-PG","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3204","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=3204"}],"version-history":[{"count":3,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3204\/revisions"}],"predecessor-version":[{"id":12908,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3204\/revisions\/12908"}],"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=3204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}