{"id":2598,"date":"2025-05-29T17:41:54","date_gmt":"2025-06-04T10:00:53","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=2598"},"modified":"2025-06-04T17:41:54","modified_gmt":"2025-06-04T10:00:53","slug":"python-list-len-syntax","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/python-list-len-syntax\/","title":{"rendered":"2025 \u6700\u65b0 Python \u7a0b\u5f0f\u6559\u5b78\uff1a\u4f7f\u7528 len() \u51fd\u6578\u8f15\u9b06\u8a08\u7b97\u4e32\u5217 (List) \u548c\u5b57\u4e32\u7684\u9577\u5ea6"},"content":{"rendered":"

<\/p>\n

2025 \u6700\u65b0 Python \u7a0b\u5f0f\u6559\u5b78\uff1a\u4f7f\u7528 len() \u51fd\u6578\u8f15\u9b06\u8a08\u7b97\u4e32\u5217 (List) \u548c\u5b57\u4e32\u7684\u9577\u5ea6<\/h2>\n

\u5728 Python \u4e2d\uff0c\u4e32\u5217\uff08List\uff09\u662f\u4e00\u7a2e\u975e\u5e38\u91cd\u8981\u4e14\u5e38\u7528\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u5b83\u53ef\u4ee5\u5132\u5b58\u591a\u500b\u5143\u7d20\uff0c\u4f8b\u5982\u6578\u5b57\u3001\u5b57\u4e32\u3001\u5e03\u6797\u503c\u7b49\u3002\u900f\u904e\u5167\u5efa\u7684 `len()` \u51fd\u6578\uff0c\u6211\u5011\u53ef\u4ee5\u5feb\u901f\u8a08\u7b97\u51fa\u4e32\u5217\u7684\u9577\u5ea6\uff0c\u9019\u5c0d\u65bc\u8cc7\u6599\u8655\u7406\u548c\u5206\u6790\u76f8\u7576\u6709\u5e6b\u52a9\u3002<\/p>\n

### \u4f7f\u7528 len() \u51fd\u6578\u8a08\u7b97\u4e32\u5217\u7684\u9577\u5ea6<\/p>\n

\u4ee5\u4e0b\u662f\u4f7f\u7528 `len()` \u51fd\u6578\u4f86\u8a08\u7b97\u4e32\u5217\u9577\u5ea6\u7684\u7c21\u55ae\u7bc4\u4f8b\uff1a<\/p>\n

“`python
\n# \u5b9a\u7fa9\u4e00\u500b\u4e32\u5217
\nmy_list = [1, 2, 3, 4, 5]\n

# \u4f7f\u7528 len() \u51fd\u6578\u4f86\u8a08\u7b97\u4e32\u5217\u7684\u9577\u5ea6
\nlist_length = len(my_list)<\/p>\n

# \u5370\u51fa\u4e32\u5217\u7684\u9577\u5ea6
\nprint(list_length)
\n“`<\/p>\n

\u57f7\u884c\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\uff0c\u5c07\u6703\u5f97\u5230\u4e32\u5217\u7684\u9577\u5ea6\uff0c\u5373\u5143\u7d20\u7684\u500b\u6578\uff1a<\/p>\n

“`
\n5
\n“`<\/p>\n

### \u4f7f\u7528 len() \u51fd\u6578\u8a08\u7b97\u5b57\u4e32\u7684\u9577\u5ea6<\/p>\n

\u9664\u4e86\u4e32\u5217\uff0c`len()` \u51fd\u6578\u540c\u6a23\u53ef\u4ee5\u7528\u4f86\u8a08\u7b97\u5b57\u4e32\u7684\u9577\u5ea6\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n

“`python
\n# \u5b9a\u7fa9\u4e00\u500b\u5b57\u4e32
\nmy_string = “Hello World!”<\/p>\n

# \u4f7f\u7528 len() \u51fd\u6578\u4f86\u8a08\u7b97\u5b57\u4e32\u7684\u9577\u5ea6
\nstring_length = len(my_string)<\/p>\n

# \u5370\u51fa\u5b57\u4e32\u7684\u9577\u5ea6
\nprint(string_length)
\n“`<\/p>\n

\u57f7\u884c\u4e0a\u9762\u7684\u7a0b\u5f0f\u78bc\uff0c\u5c07\u6703\u5f97\u5230\u5b57\u4e32\u7684\u9577\u5ea6\uff1a<\/p>\n

“`
\n12
\n“`<\/p>\n

### \u932f\u8aa4\u6392\u9664\u8207\u6ce8\u610f\u4e8b\u9805<\/p>\n

– \u78ba\u4fdd\u50b3\u905e\u7d66 `len()` \u51fd\u6578\u7684\u8cc7\u6599\u7d50\u69cb\u662f\u53ef\u8a08\u7b97\u9577\u5ea6\u7684\uff0c\u4f8b\u5982\u4e32\u5217\u3001\u5b57\u4e32\u3001\u5b57\u5178\u7b49\u3002\u82e5\u50b3\u905e\u5176\u4ed6\u985e\u578b\uff08\u5982\u6578\u5b57\uff09\uff0c\u5c07\u6703\u5f15\u767c `TypeError`\u3002
\n– `len()` \u51fd\u6578\u7684\u6642\u9593\u8907\u96dc\u5ea6\u70ba O(1)\uff0c\u9019\u610f\u5473\u8457\u4e0d\u7ba1\u4e32\u5217\u7684\u5927\u5c0f\uff0c\u8a08\u7b97\u9577\u5ea6\u6240\u9700\u7684\u6642\u9593\u90fd\u662f\u56fa\u5b9a\u7684\u3002<\/p>\n

### \u5ef6\u4f38\u61c9\u7528<\/p>\n

– `len()` \u51fd\u6578\u4e0d\u50c5\u53ef\u4ee5\u7528\u4f86\u8a08\u7b97\u4e32\u5217\u548c\u5b57\u4e32\u7684\u9577\u5ea6\uff0c\u5b83\u9084\u53ef\u4ee5\u7528\u65bc\u8a08\u7b97\u5b57\u5178\u4e2d\u9375\u503c\u5c0d\u7684\u6578\u91cf\uff0c\u975e\u5e38\u9069\u5408\u7528\u65bc\u8cc7\u6599\u5206\u6790\u548c\u6e05\u7406\u7684\u5de5\u4f5c\u3002
\n– \u82e5\u60a8\u60f3\u6df1\u5165\u5b78\u7fd2 Python \u7684\u6578\u64da\u7d50\u69cb\u548c\u51fd\u6578\u4f7f\u7528\uff0c\u5efa\u8b70\u53c3\u8003 [\u9019\u7bc7 Python \u6559\u5b78\u6587\u7ae0](https:\/\/vocus.cc\/article\/605c7c9cfd897800068f5b14)\u3002<\/p>\n

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

`len()` \u51fd\u6578\u5728 Python \u4e2d\u662f\u4e00\u500b\u975e\u5e38\u5be6\u7528\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5feb\u901f\u8a08\u7b97\u4e32\u5217\u548c\u5b57\u4e32\u7684\u9577\u5ea6\uff0c\u662f\u6bcf\u4f4d Python \u958b\u767c\u8005\u90fd\u61c9\u719f\u6089\u7684\u91cd\u8981\u51fd\u6578\u3002<\/p>\n

—<\/p>\n

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

**Q1: len() \u51fd\u6578\u80fd\u8a08\u7b97\u54ea\u4e9b\u8cc7\u6599\u985e\u578b\u7684\u9577\u5ea6\uff1f**
\nA1: `len()` \u51fd\u6578\u53ef\u4ee5\u8a08\u7b97\u4e32\u5217\u3001\u5b57\u4e32\u3001\u5b57\u5178\u3001\u96c6\u5408\u7b49\u8cc7\u6599\u985e\u578b\u7684\u9577\u5ea6\u3002<\/p>\n

**Q2: \u4f7f\u7528 len() \u51fd\u6578\u6642\u6703\u9047\u5230\u54ea\u4e9b\u5e38\u898b\u932f\u8aa4\uff1f**
\nA2: \u6700\u5e38\u898b\u7684\u932f\u8aa4\u662f\u50b3\u905e\u7d66 `len()` \u51fd\u6578\u7684\u8cc7\u6599\u985e\u578b\u4e0d\u652f\u6301\u8a08\u7b97\u9577\u5ea6\uff0c\u9019\u6703\u5f15\u767c `TypeError`\u3002<\/p>\n

**Q3: \u9664\u4e86 len() \u51fd\u6578\uff0cPython \u4e2d\u9084\u6709\u54ea\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u7372\u5f97\u4e32\u5217\u7684\u9577\u5ea6\uff1f**
\nA3: \u9664\u4e86 `len()` \u51fd\u6578\uff0c\u60a8\u9084\u53ef\u4ee5\u4f7f\u7528\u8ff4\u5708\u904d\u6b77\u4e32\u5217\u4e26\u624b\u52d5\u8a08\u6578\uff0c\u4f46\u9019\u6a23\u7684\u505a\u6cd5\u6548\u7387\u8f03\u4f4e\uff0c\u901a\u5e38\u4e0d\u5efa\u8b70\u4f7f\u7528\u3002<\/p>\n

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

2025 \u6700\u65b0 Python \u7a0b\u5f0f\u6559\u5b78\uff1a\u4f7f\u7528 le…<\/p>\n","protected":false},"author":1,"featured_media":2518,"comment_status":"open","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":[],"class_list":["post-2598","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-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-FU","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2598","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=2598"}],"version-history":[{"count":5,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2598\/revisions"}],"predecessor-version":[{"id":2603,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/2598\/revisions\/2603"}],"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=2598"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=2598"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=2598"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}