{"id":3126,"date":"2025-05-30T16:16:24","date_gmt":"2025-06-04T08:51:23","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=3126"},"modified":"2025-06-04T16:16:24","modified_gmt":"2025-06-04T08:51:23","slug":"%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84class_getitem%e5%8a%9f%e8%83%bd","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84class_getitem%e5%8a%9f%e8%83%bd\/","title":{"rendered":"\u6df1\u5165\u63a2\u7d22 Python \u4e2d\u7684 class_getitem()\uff1a\u6700\u4f73\u5be6\u8e10\u8207\u61c9\u7528\u7bc4\u4f8b"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u63a2\u7d22 Python \u4e2d\u7684 class_getitem()<\/h1>\n

\u5728 Python \u7684\u7269\u4ef6\u5c0e\u5411\u7de8\u7a0b\u4e2d\uff0c`class_getitem()` \u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u51fd\u5f0f\uff0c\u5b83\u5141\u8a31\u958b\u767c\u8005\u5728\u985e\u5225\u4e2d\u4f7f\u7528\u7d22\u5f15\u4f86\u7372\u53d6\u7279\u5b9a\u7684\u5c6c\u6027\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u7a0b\u5f0f\u7684\u53ef\u8b80\u6027\uff0c\u9084\u6e1b\u5c11\u4e86\u7a0b\u5f0f\u78bc\u7684\u8907\u96dc\u5ea6\u3002<\/p>\n

## \u4ec0\u9ebc\u662f class_getitem()\uff1f<\/p>\n

`class_getitem()` \u51fd\u5f0f\u53ef\u4ee5\u8b93\u4f60\u5728\u985e\u5225\u5167\u90e8\u4f7f\u7528\u7d22\u5f15\u4f86\u5b58\u53d6\u5c6c\u6027\uff0c\u907f\u514d\u4e86\u4f7f\u7528 `getattr()` \u6216 `setattr()` \u7684\u7e41\u7463\u904e\u7a0b\u3002\u9019\u5728\u8655\u7406\u52d5\u614b\u5c6c\u6027\u6216\u8907\u96dc\u8cc7\u6599\u7d50\u69cb\u6642\u7279\u5225\u6709\u7528\u3002<\/p>\n

### \u8a9e\u6cd5<\/p>\n

`class_getitem()` \u51fd\u5f0f\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

“`python
\nclass_getitem(cls, item)
\n“`<\/p>\n

– **cls**\uff1a\u8981\u53d6\u5f97\u5c6c\u6027\u7684\u985e\u5225\u3002
\n– **item**\uff1a\u8981\u53d6\u5f97\u7684\u5c6c\u6027\u540d\u7a31\u3002<\/p>\n

### \u5be6\u4f5c\u7bc4\u4f8b<\/p>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u5177\u9ad4\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5229\u7528 `class_getitem()` \u4f86\u7372\u53d6\u548c\u8a2d\u5b9a\u985e\u5225\u5c6c\u6027\uff1a<\/p>\n

“`python
\nclass MyClass:
\n def __init__(self):
\n self.my_attribute = “Hello, World!”<\/p>\n

# \u7372\u53d6\u5c6c\u6027
\nmy_object = MyClass()
\nmy_attribute = MyClass.__getitem__(‘my_attribute’)
\nprint(my_attribute) # \u8f38\u51fa: Hello, World!<\/p>\n

# \u8a2d\u5b9a\u5c6c\u6027
\nMyClass.__setitem__(‘my_attribute’, ‘New Value’)
\nprint(my_object.my_attribute) # \u8f38\u51fa: New Value
\n“`<\/p>\n

### \u932f\u8aa4\u6392\u9664<\/p>\n

\u5728\u4f7f\u7528 `class_getitem()` \u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u4e00\u4e9b\u5e38\u898b\u932f\u8aa4\uff0c\u4f8b\u5982\uff1a<\/p>\n

1. **AttributeError**\uff1a\u7576\u4f60\u5617\u8a66\u8a2a\u554f\u4e0d\u5b58\u5728\u7684\u5c6c\u6027\u6642\uff0c\u6703\u7522\u751f\u6b64\u932f\u8aa4\u3002\u78ba\u4fdd\u4f60\u8981\u8a2a\u554f\u7684\u5c6c\u6027\u540d\u7a31\u6b63\u78ba\u7121\u8aa4\u3002
\n2. **TypeError**\uff1a\u5982\u679c\u4f60\u5617\u8a66\u7528\u4e0d\u6b63\u78ba\u7684\u985e\u578b\u4f5c\u70ba\u7d22\u5f15\uff0c\u6703\u5f15\u767c\u6b64\u932f\u8aa4\u3002<\/p>\n

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

`class_getitem()` \u53ef\u4ee5\u7528\u65bc\u5275\u5efa\u66f4\u8907\u96dc\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u5982\u5b57\u5178\u6216\u6578\u7d44\uff0c\u4e26\u4e14\u53ef\u4ee5\u8207\u5176\u4ed6 Python \u7279\u6027\u7d50\u5408\u4f7f\u7528\uff0c\u4f8b\u5982\u88dd\u98fe\u5668\u548c\u4e0a\u4e0b\u6587\u7ba1\u7406\u5668\uff0c\u4f86\u5be6\u73fe\u66f4\u9ad8\u6548\u7684\u7de8\u7a0b\u6a21\u5f0f\u3002<\/p>\n

\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3 Python \u7684\u5176\u4ed6\u529f\u80fd\uff0c\u8acb\u53c3\u8003 [Vocus \u7684 Python \u6559\u5b78](https:\/\/vocus.cc) \u6216 [Miner \u7684 Python \u6559\u5b78](https:\/\/miner.tw)\u3002<\/p>\n

## \u7d50\u5c3e<\/p>\n

`class_getitem()` \u662f\u4e00\u500b\u5f37\u5927\u7684\u529f\u80fd\uff0c\u5728 Python \u4e2d\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u548c\u53ef\u8b80\u6027\u3002\u901a\u904e\u672c\u7bc7\u6587\u7ae0\u7684\u5b78\u7fd2\uff0c\u5e0c\u671b\u80fd\u5e6b\u52a9\u4f60\u66f4\u6709\u6548\u5730\u4f7f\u7528 Python \u9032\u884c\u7269\u4ef6\u5c0e\u5411\u7de8\u7a0b\u3002<\/p>\n

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

**Q1\uff1a\u4ec0\u9ebc\u6642\u5019\u61c9\u8a72\u4f7f\u7528 class_getitem()\uff1f**
\nA1\uff1a\u7576\u4f60\u9700\u8981\u52d5\u614b\u5730\u8a2a\u554f\u985e\u5225\u5c6c\u6027\uff0c\u6216\u5e0c\u671b\u7c21\u5316\u5c6c\u6027\u5b58\u53d6\u904e\u7a0b\u6642\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 `class_getitem()`\u3002<\/p>\n

**Q2\uff1aclass_getitem() \u662f\u5426\u53d6\u4ee3\u4e86 getattr()\uff1f**
\nA2\uff1a\u4e0d\u5b8c\u5168\u662f\uff0c`class_getitem()` \u63d0\u4f9b\u4e86\u4e00\u7a2e\u65b0\u7684\u65b9\u6cd5\u4f86\u8a2a\u554f\u5c6c\u6027\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c`getattr()` \u4ecd\u7136\u662f\u5fc5\u8981\u7684\uff0c\u7279\u5225\u662f\u7576\u4f60\u9700\u8981\u66f4\u9748\u6d3b\u7684\u5c6c\u6027\u5b58\u53d6\u6642\u3002<\/p>\n

**Q3\uff1a\u5982\u4f55\u8655\u7406 class_getitem() \u7684\u932f\u8aa4\uff1f**
\nA3\uff1a\u5728\u4f7f\u7528\u524d\uff0c\u78ba\u4fdd\u4f60\u8981\u8a2a\u554f\u7684\u5c6c\u6027\u5b58\u5728\uff0c\u4e26\u4f7f\u7528\u9069\u7576\u7684\u985e\u578b\u4f5c\u70ba\u7d22\u5f15\u4ee5\u907f\u514d TypeError\u3002<\/p>\n

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

\u4e86\u89e3Python\u4e2d\u7684class_getitem()\u529f\u80fd\uff0c\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528class_getitem()\u4f86\u66f4\u6709\u6548\u5730\u64cd\u4f5cPython\u7a0b\u5f0f\u78bc\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39class_getitem()\u7684\u529f\u80fd\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u4f86\u89e3\u91cb\u5982\u4f55\u4f7f\u7528\u5b83\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-3126","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\/3126","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=3126"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3126\/revisions"}],"predecessor-version":[{"id":3127,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3126\/revisions\/3127"}],"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=3126"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3126"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3126"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}