{"id":2896,"date":"2025-05-30T16:56:51","date_gmt":"2025-06-04T09:28:51","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=2896"},"modified":"2025-06-04T16:56:51","modified_gmt":"2025-06-04T09:28:51","slug":"%e4%ba%86%e8%a7%a3python%e4%b8%adlen%e5%87%bd%e6%95%b8%e7%9a%84%e7%94%a8%e6%b3%95-2","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e4%b8%adlen%e5%87%bd%e6%95%b8%e7%9a%84%e7%94%a8%e6%b3%95-2\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3 Python \u4e2d\u7684 len() \u51fd\u6578\uff1a2025 \u6700\u65b0\u7528\u6cd5\u8207\u5be6\u4f5c\u7bc4\u4f8b"},"content":{"rendered":"

<\/p>\n

\u5728 Python \u7a0b\u5f0f\u8a2d\u8a08\u4e2d\uff0c`len()` \u51fd\u6578\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\u3002\u9019\u500b\u5167\u5efa\u51fd\u6578\u80fd\u5920\u5feb\u901f\u8fd4\u56de\u591a\u7a2e\u985e\u578b\u8cc7\u6599\u7684\u9577\u5ea6\uff0c\u5305\u62ec\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5143\u7d44\u548c\u5b57\u5178\u7b49\u3002\u672c\u6587\u5c07\u4ecb\u7d39 `len()` \u51fd\u6578\u7684\u6700\u65b0\u7528\u6cd5\u53ca\u5be6\u4f5c\u7bc4\u4f8b\uff0c\u5e6b\u52a9\u4f60\u57282025\u5e74\u7684\u958b\u767c\u4e2d\u904b\u7528\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n

len() \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5<\/h2>\n

`len()` \u51fd\u6578\u7684\u57fa\u672c\u7528\u6cd5\u662f\u5c07\u4e00\u500b\u53ef\u8a08\u6578\u7684\u5c0d\u8c61\u4f5c\u70ba\u53c3\u6578\uff0c\u4e26\u8fd4\u56de\u5176\u9577\u5ea6\u3002\u4ee5\u4e0b\u662f\u7372\u53d6\u5b57\u7b26\u4e32\u9577\u5ea6\u7684\u7bc4\u4f8b\uff1a<\/p>\n

“`python
\nmy_string = “Hello World!”
\nlength = len(my_string)
\nprint(length)
\n“`<\/p>\n

**\u8f38\u51fa\uff1a**<\/p>\n

“`python
\n12
\n“`<\/p>\n

\u9019\u6bb5\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u5b57\u7b26\u4e32 `my_string`\uff0c\u4e26\u4f7f\u7528 `len()` \u51fd\u6578\u8a08\u7b97\u5176\u9577\u5ea6\uff0c\u7d50\u679c\u70ba 12\u3002<\/p>\n

len() \u51fd\u6578\u7684\u61c9\u7528<\/h2>\n

`len()` \u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u591a\u7a2e\u60c5\u6cc1\uff0c\u4f8b\u5982\u6aa2\u67e5\u5217\u8868\u662f\u5426\u70ba\u7a7a\uff1a<\/p>\n

“`python
\nmy_list = []\nif len(my_list) == 0:
\n print(“List is empty”)
\n“`<\/p>\n

**\u8f38\u51fa\uff1a**<\/p>\n

“`python
\nList is empty
\n“`<\/p>\n

\u6b64\u5916\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u5229\u7528 `len()` \u51fd\u6578\u4f86\u8fed\u4ee3\u5217\u8868\u7684\u5167\u5bb9\uff1a<\/p>\n

“`python
\nmy_list = [1, 2, 3, 4]\nfor i in range(len(my_list)):
\n print(my_list[i])
\n“`<\/p>\n

**\u8f38\u51fa\uff1a**<\/p>\n

“`python
\n1
\n2
\n3
\n4
\n“`<\/p>\n

\u5728\u6b64\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u4f7f\u7528 `len(my_list)` \u7372\u53d6\u5217\u8868\u7684\u9577\u5ea6\uff0c\u7136\u5f8c\u900f\u904e\u8ff4\u5708\u9010\u4e00\u8f38\u51fa\u6bcf\u500b\u5143\u7d20\u3002<\/p>\n

\u932f\u8aa4\u6392\u9664\u8207\u6700\u4f73\u5be6\u8e10<\/h2>\n

\u4f7f\u7528 `len()` \u51fd\u6578\u6642\uff0c\u5e38\u898b\u7684\u932f\u8aa4\u5305\u62ec\uff1a<\/p>\n

1. **\u50b3\u905e\u4e0d\u652f\u6301\u8a08\u6578\u7684\u5c0d\u8c61**\uff1a\u78ba\u4fdd\u50b3\u905e\u7d66 `len()` \u7684\u5c0d\u8c61\u662f\u53ef\u8a08\u6578\u7684\uff08\u5982\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5b57\u5178\u7b49\uff09\u3002
\n2. **\u7a7a\u503c\u8655\u7406**\uff1a\u5728\u4f7f\u7528 `len()` \u4e4b\u524d\u6aa2\u67e5\u5c0d\u8c61\u662f\u5426\u70ba `None` \u4ee5\u907f\u514d\u932f\u8aa4\u3002<\/p>\n

\u6700\u4f73\u5be6\u8e10\u662f\u59cb\u7d42\u4f7f\u7528 `len()` \u4f86\u7372\u53d6\u8cc7\u6599\u7d50\u69cb\u7684\u9577\u5ea6\uff0c\u800c\u4e0d\u662f\u624b\u52d5\u8a08\u7b97\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u7a0b\u5f0f\u7684\u53ef\u8b80\u6027\u8207\u6548\u7387\u3002<\/p>\n

\u5ef6\u4f38\u61c9\u7528<\/h2>\n

`len()` \u51fd\u6578\u4e0d\u50c5\u80fd\u7372\u53d6\u9577\u5ea6\uff0c\u9084\u80fd\u8207\u5176\u4ed6\u51fd\u6578\u7d50\u5408\u4f7f\u7528\u4ee5\u5be6\u73fe\u66f4\u8907\u96dc\u7684\u908f\u8f2f\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u5224\u65b7\u4e00\u500b\u5b57\u7b26\u4e32\u662f\u5426\u70ba\u7a7a\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n

“`python
\nmy_string = “”
\nif len(my_string) == 0:
\n print(“String is empty”)
\n“`<\/p>\n

\u9019\u6a23\u7684\u6aa2\u67e5\u53ef\u4ee5\u5e6b\u52a9\u907f\u514d\u5728\u8655\u7406\u7a7a\u5b57\u7b26\u4e32\u6642\u51fa\u73fe\u932f\u8aa4\u3002<\/p>\n

\u5982\u9700\u66f4\u6df1\u5165\u7684 Python \u6559\u5b78\uff0c\u8acb\u53c3\u8003 [\u9019\u88e1](https:\/\/vocus.cc)\uff0c\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u3002<\/p>\n

Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/h2>\n

**Q1: len() \u51fd\u6578\u80fd\u5426\u7528\u65bc\u81ea\u5b9a\u7fa9\u5c0d\u8c61\uff1f**
\nA1: \u662f\u7684\uff0c\u82e5\u8981\u4f7f\u7528 `len()` \u51fd\u6578\u7372\u53d6\u81ea\u5b9a\u7fa9\u5c0d\u8c61\u7684\u9577\u5ea6\uff0c\u9700\u5728\u985e\u4e2d\u5be6\u73fe `__len__()` \u65b9\u6cd5\u3002<\/p>\n

**Q2: len() \u51fd\u6578\u80fd\u5426\u8a08\u7b97\u591a\u7dad\u5217\u8868\u7684\u9577\u5ea6\uff1f**
\nA2: `len()` \u51fd\u6578\u50c5\u8fd4\u56de\u7b2c\u4e00\u7dad\u7684\u9577\u5ea6\uff0c\u82e5\u9700\u8981\u8a08\u7b97\u591a\u7dad\u5217\u8868\u7684\u6240\u6709\u5143\u7d20\u6578\u91cf\uff0c\u9700\u4f7f\u7528\u905e\u8ff4\u6216\u5176\u4ed6\u65b9\u6cd5\u3002<\/p>\n

**Q3: \u4f7f\u7528 len() \u51fd\u6578\u662f\u5426\u6703\u5f71\u97ff\u6027\u80fd\uff1f**
\nA3: `len()` \u51fd\u6578\u901a\u5e38\u6548\u7387\u5f88\u9ad8\u3002\u4e0d\u904e\uff0c\u5728\u5927\u578b\u8cc7\u6599\u7d50\u69cb\u4e2d\uff0c\u5efa\u8b70\u907f\u514d\u591a\u6b21\u8abf\u7528 `len()`\uff0c\u800c\u662f\u5c07\u7d50\u679c\u5b58\u5132\u5230\u8b8a\u6578\u4e2d\u4ee5\u63d0\u9ad8\u6548\u7387\u3002<\/p>\n

—<\/p>\n

\u9019\u6a23\u7684\u5167\u5bb9\u4e0d\u50c5\u66f4\u65b0\u4e86\u8a9e\u6cd5\u8207\u5be6\u4f5c\u7bc4\u4f8b\uff0c\u9084\u589e\u52a0\u4e86\u932f\u8aa4\u6392\u9664\u8207\u5ef6\u4f38\u61c9\u7528\uff0c\u4e26\u4e14\u7b26\u5408 SEO \u6700\u4f73\u5be6\u8e10\uff0c\u4f7f\u6587\u7ae0\u66f4\u5177\u5438\u5f15\u529b\u8207\u5be6\u7528\u6027\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

Python\u4e2dlen()\u51fd\u6578\u53ef\u4ee5\u7528\u65bc\u8fd4\u56de\u985e\u7684\u9577\u5ea6\uff0c\u53ef\u4ee5\u7528\u65bc\u8a08\u7b97\u5b57\u7b26\u4e32\u3001\u5217\u8868\u3001\u5b57\u5178\u3001\u5143\u7d44\u7b49\u7684\u9577\u5ea6\uff0c\u672c\u6587\u5c07\u4ecb\u7d39len()\u51fd\u6578\u7684\u7528\u6cd5\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5b83\u4f86\u8a08\u7b97\u4e0d\u540c\u985e\u578b\u7684\u9577\u5ea6\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-2896","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-KI","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2896","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=2896"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2896\/revisions"}],"predecessor-version":[{"id":2897,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2896\/revisions\/2897"}],"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=2896"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=2896"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=2896"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}