<\/p>\n
\u5728 Python \u4e2d\uff0c`subclasshook()` \u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u51fd\u5f0f\uff0c\u5b83\u5141\u8a31\u958b\u767c\u8005\u6aa2\u67e5\u4e00\u500b\u7269\u4ef6\u662f\u5426\u70ba\u53e6\u4e00\u500b\u7269\u4ef6\u7684\u5b50\u985e\u5225\u3002\u9019\u4e0d\u50c5\u7c21\u5316\u4e86\u985e\u5225\u6aa2\u67e5\u7684\u904e\u7a0b\uff0c\u9084\u63d0\u4f9b\u4e86\u64f4\u5c55\u7269\u4ef6\u529f\u80fd\u7684\u4fbf\u5229\u6027\u3002\u96a8\u8457 Python \u8a9e\u8a00\u7684\u6f14\u9032\uff0c\u7406\u89e3\u9019\u500b\u51fd\u5f0f\u7684\u6700\u4f73\u5be6\u8e10\u5c0d\u65bc\u6bcf\u4f4d\u958b\u767c\u8005\u4f86\u8aaa\u90fd\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n
## `subclasshook()` \u7684\u5b9a\u7fa9<\/p>\n
`subclasshook()` \u51fd\u5f0f\u7684\u5b9a\u7fa9\u5982\u4e0b\uff1a<\/p>\n
“`python
\ndef subclasshook(cls, subclass):
\n “””
\n \u6aa2\u67e5 subclass \u662f\u5426\u70ba cls \u7684\u5b50\u985e\u5225\u3002
\n :param cls: \u76ee\u6a19\u985e\u5225
\n :param subclass: \u88ab\u6aa2\u67e5\u7684\u7269\u4ef6\u6216\u985e\u5225
\n :return: \u5982\u679c subclass \u662f cls \u7684\u5b50\u985e\u5225\u5247\u8fd4\u56de True\uff0c\u5426\u5247\u8fd4\u56de False
\n “””
\n return issubclass(subclass, cls)
\n“`<\/p>\n
\u9019\u500b\u51fd\u5f0f\u7684\u7b2c\u4e00\u500b\u53c3\u6578 `cls` \u662f\u8981\u6aa2\u67e5\u7684\u985e\u5225\uff0c\u800c\u7b2c\u4e8c\u500b\u53c3\u6578 `subclass` \u53ef\u4ee5\u662f\u4efb\u4f55\u985e\u5225\u6216\u7269\u4ef6\u3002\u7576 `subclass` \u662f `cls` \u7684\u5b50\u985e\u5225\u6642\uff0c\u51fd\u5f0f\u5c07\u8fd4\u56de `True`\uff0c\u5426\u5247\u8fd4\u56de `False`\u3002<\/p>\n
## \u5be6\u4f5c\u7bc4\u4f8b<\/p>\n
\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u985e\u5225 `MyClass`\uff0c\u4e26\u5e0c\u671b\u6aa2\u67e5\u67d0\u500b\u7269\u4ef6\u662f\u5426\u70ba\u5176\u5b50\u985e\u5225\u4e26\u57f7\u884c\u76f8\u61c9\u7684\u529f\u80fd\u3002\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u505a\uff1a<\/p>\n
“`python
\nclass MyClass:
\n def do_something(self):
\n print(“Doing something!”)<\/p>\n
class MySubClass(MyClass):
\n pass<\/p>\n
obj = MySubClass()<\/p>\n
if subclasshook(MyClass, obj):
\n obj.do_something() # \u5c07\u8f38\u51fa “Doing something!”
\n“`<\/p>\n
\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b `MyClass` \u548c\u4e00\u500b\u7e7c\u627f\u81ea `MyClass` \u7684 `MySubClass`\u3002\u7576\u6211\u5011\u6aa2\u67e5 `obj` \u662f\u5426\u70ba `MyClass` \u7684\u5b50\u985e\u5225\u6642\uff0c\u689d\u4ef6\u6210\u7acb\uff0c\u56e0\u800c\u57f7\u884c `do_something()` \u65b9\u6cd5\u3002<\/p>\n
## \u932f\u8aa4\u6392\u9664<\/p>\n
\u5728\u4f7f\u7528 `subclasshook()` \u6642\uff0c\u53ef\u80fd\u6703\u9047\u5230\u4ee5\u4e0b\u5e7e\u500b\u5e38\u898b\u932f\u8aa4\uff1a<\/p>\n
1. **TypeError**\uff1a\u7576 `subclass` \u4e0d\u662f\u985e\u5225\u6642\uff0c\u5c07\u5f15\u767c\u6b64\u932f\u8aa4\u3002\u8acb\u78ba\u4fdd\u60a8\u50b3\u5165\u7684\u7b2c\u4e8c\u500b\u53c3\u6578\u662f\u4e00\u500b\u6709\u6548\u7684\u985e\u5225\u6216\u7269\u4ef6\u3002<\/p>\n
2. **AttributeError**\uff1a\u5982\u679c\u5617\u8a66\u5728\u4e00\u500b\u6c92\u6709\u7e7c\u627f `cls` \u7684\u985e\u5225\u4e0a\u8abf\u7528 `do_something()`\uff0c\u5c07\u6703\u51fa\u73fe\u6b64\u932f\u8aa4\u3002\u8acb\u78ba\u8a8d\u60a8\u5c0d\u8c61\u7684\u985e\u5225\u78ba\u5be6\u7e7c\u627f\u81ea\u76ee\u6a19\u985e\u5225\u3002<\/p>\n
## \u5ef6\u4f38\u61c9\u7528<\/p>\n
`subclasshook()` \u4e0d\u50c5\u9650\u65bc\u57fa\u672c\u7684\u985e\u5225\u6aa2\u67e5\uff0c\u5b83\u9084\u53ef\u4ee5\u7528\u65bc\u4ee5\u4e0b\u60c5\u5883\uff1a<\/p>\n
– **\u81ea\u5b9a\u7fa9\u985e\u5225\u8a3b\u518a**\uff1a\u60a8\u53ef\u4ee5\u4f7f\u7528 `subclasshook()` \u4f86\u6aa2\u67e5\u4e00\u7d44\u81ea\u5b9a\u7fa9\u985e\u5225\u662f\u5426\u7b26\u5408\u7279\u5b9a\u898f\u7bc4\uff0c\u5f9e\u800c\u9032\u884c\u76f8\u61c9\u7684\u8655\u7406\u3002
\n– **\u63d2\u4ef6\u7cfb\u7d71**\uff1a\u5728\u8a2d\u8a08\u63d2\u4ef6\u7cfb\u7d71\u6642\uff0c\u60a8\u53ef\u4ee5\u5229\u7528\u6b64\u51fd\u5f0f\u78ba\u4fdd\u52a0\u8f09\u7684\u63d2\u4ef6\u9075\u5faa\u7279\u5b9a\u7684\u63a5\u53e3\u3002<\/p>\n
\u9019\u4e9b\u61c9\u7528\u80fd\u5920\u5e6b\u52a9\u60a8\u66f4\u9748\u6d3b\u5730\u8a2d\u8a08\u548c\u64f4\u5c55\u60a8\u7684 Python \u61c9\u7528\u7a0b\u5f0f\u3002<\/p>\n
## \u7d50\u8ad6<\/p>\n
`subclasshook()` \u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u5b83\u53ef\u4ee5\u8b93\u958b\u767c\u8005\u8f15\u9b06\u5730\u6aa2\u67e5\u7269\u4ef6\u7684\u985e\u5225\uff0c\u4e26\u64f4\u5c55\u7269\u4ef6\u7684\u529f\u80fd\u3002\u4e86\u89e3\u5176\u4f7f\u7528\u65b9\u5f0f\u548c\u6700\u4f73\u5be6\u8e10\u5c07\u5927\u5927\u63d0\u9ad8\u60a8\u5728 Python \u958b\u767c\u4e2d\u7684\u6548\u7387\u3002<\/p>\n
\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3 Python \u7684\u9032\u968e\u4e3b\u984c\uff0c\u8acb\u53c3\u8003 [vocus.cc \u7684 Python \u6559\u5b78](https:\/\/vocus.cc)\u3002<\/p>\n
## Q&A\uff08\u5e38\u898b\u554f\u984c\u89e3\u7b54\uff09<\/p>\n
**Q1: `subclasshook()` \u548c `issubclass()` \u6709\u4ec0\u9ebc\u5340\u5225\uff1f**
\nA1: `subclasshook()` \u662f\u7528\u65bc\u81ea\u5b9a\u7fa9\u985e\u5225\u7684\u6aa2\u67e5\uff0c\u800c `issubclass()` \u662f\u5167\u5efa\u7684\u51fd\u5f0f\uff0c\u53ef\u6aa2\u67e5\u4efb\u610f\u985e\u5225\u4e4b\u9593\u7684\u95dc\u4fc2\u3002<\/p>\n
**Q2: \u6211\u61c9\u8a72\u5728\u4ec0\u9ebc\u6642\u5019\u4f7f\u7528 `subclasshook()`\uff1f**
\nA2: \u7576\u60a8\u9700\u8981\u5728\u81ea\u5b9a\u7fa9\u985e\u5225\u4e2d\u5be6\u73fe\u8907\u96dc\u7684\u985e\u5225\u6aa2\u67e5\u908f\u8f2f\u6642\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528 `subclasshook()`\u3002<\/p>\n
**Q3: \u53ef\u4ee5\u5c07 `subclasshook()` \u7528\u65bc\u591a\u91cd\u7e7c\u627f\u7684\u60c5\u6cc1\u55ce\uff1f**
\nA3: \u662f\u7684\uff0c`subclasshook()` \u53ef\u4ee5\u8655\u7406\u591a\u91cd\u7e7c\u627f\u7684\u60c5\u6cc1\uff0c\u53ea\u8981\u78ba\u4fdd\u6240\u6709\u53c3\u8207\u7684\u985e\u5225\u6b63\u78ba\u5be6\u73fe\u4e86\u8a72\u6aa2\u67e5\u908f\u8f2f\u3002<\/p>\n
—<\/p>\n","protected":false},"excerpt":{"rendered":"
\u4e86\u89e3Python\u4e2d\u7684Subclasshook()\u529f\u80fd\uff0cSubclasshook()\u662fPython\u4e2d\u7684\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u63a7\u5236\u5b50\u985e\u7684\u884c\u70ba\u3002\u672c\u6587\u5c07\u8a73\u7d30\u4ecb\u7d39Subclasshook()\u7684\u529f\u80fd\uff0c\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u5b83\u4f86\u63d0\u9ad8\u958b\u767c\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-3100","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-O0","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3100","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=3100"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3100\/revisions"}],"predecessor-version":[{"id":3101,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3100\/revisions\/3101"}],"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=3100"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3100"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3100"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}