<\/p>\n
\u5728 Python \u4e2d\uff0c`subclasshook()` \u662f\u4e00\u500b\u5f37\u5927\u7684\u51fd\u5f0f\uff0c\u5c08\u70ba\u958b\u767c\u8005\u8a2d\u8a08\uff0c\u7528\u4ee5\u6aa2\u67e5\u4e00\u500b\u7269\u4ef6\u662f\u5426\u70ba\u53e6\u4e00\u500b\u7269\u4ef6\u7684\u5b50\u985e\u5225\u3002\u9019\u4e00\u529f\u80fd\u4e0d\u50c5\u7c21\u5316\u4e86\u985e\u5225\u6aa2\u67e5\u7684\u904e\u7a0b\uff0c\u540c\u6642\u4e5f\u4f7f\u5f97\u64f4\u5c55\u7269\u4ef6\u7684\u529f\u80fd\u8b8a\u5f97\u66f4\u70ba\u5bb9\u6613\u3002\u96a8\u8457 Python \u7684\u4e0d\u65b7\u66f4\u65b0\uff0c\u4e86\u89e3\u5176\u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u8b8a\u5f97\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n
## `subclasshook()` \u7684\u5b9a\u7fa9<\/p>\n
`subclasshook()` \u51fd\u5f0f\u7684\u57fa\u672c\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
\n :param cls: \u7236\u985e\u5225
\n :param subclass: \u8981\u6aa2\u67e5\u7684\u5b50\u985e\u5225
\n :return: \u82e5 subclass \u662f cls \u7684\u5b50\u985e\u5225\uff0c\u5247\u56de\u50b3 True\uff0c\u5426\u5247\u56de\u50b3 False
\n “””
\n return issubclass(subclass, cls)
\n“`<\/p>\n
\u9019\u88e1\uff0c`cls` \u662f\u4e00\u500b\u985e\u5225\uff0c\u800c `subclass` \u5247\u53ef\u4ee5\u662f\u4efb\u610f\u7269\u4ef6\u6216\u985e\u5225\u3002\u5982\u679c `subclass` \u662f `cls` \u7684\u5b50\u985e\u5225\uff0c\u5247\u51fd\u5f0f\u6703\u56de\u50b3 `True`\uff0c\u5426\u5247\u6703\u56de\u50b3 `False`\u3002<\/p>\n
## \u5be6\u4f5c\u7bc4\u4f8b<\/p>\n
\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u985e\u5225 `MyClass`\uff0c\u4e26\u4e14\u5e0c\u671b\u4f7f\u7528 `subclasshook()` \u4f86\u6aa2\u67e5\u67d0\u500b\u7269\u4ef6\u662f\u5426\u70ba `MyClass` \u7684\u5b50\u985e\u5225\u3002\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u5be6\u4f5c\uff1a<\/p>\n
“`python
\nclass MyClass:
\n def do_something(self):
\n print(“Doing something…”)<\/p>\n
def do_something(obj):
\n if subclasshook(MyClass, type(obj)):
\n obj.do_something()
\n else:
\n print(“The object is not a subclass of MyClass.”)<\/p>\n
# \u4f7f\u7528\u7bc4\u4f8b
\nclass MySubclass(MyClass):
\n pass<\/p>\n
instance = MySubclass()
\ndo_something(instance) # \u6703\u8f38\u51fa “Doing something…”
\n“`<\/p>\n
\u9019\u6bb5\u7a0b\u5f0f\u78bc\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b `MyClass` \u985e\u5225\u53ca\u5176\u65b9\u6cd5 `do_something()`\u3002\u63a5\u8457\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b `MySubclass` \u985e\u5225\u4f5c\u70ba `MyClass` \u7684\u5b50\u985e\u5225\uff0c\u4e26\u4f7f\u7528 `do_something()` \u51fd\u5f0f\u4f86\u6aa2\u67e5\u7269\u4ef6\u985e\u578b\u3002<\/p>\n
## \u932f\u8aa4\u6392\u9664<\/p>\n
\u5728\u4f7f\u7528 `subclasshook()` \u6642\uff0c\u958b\u767c\u8005\u53ef\u80fd\u6703\u9047\u5230\u4ee5\u4e0b\u5e38\u898b\u932f\u8aa4\uff1a<\/p>\n
1. **TypeError**\uff1a\u82e5\u50b3\u5165\u7684 `subclass` \u4e0d\u662f\u985e\u5225\u6216\u7269\u4ef6\uff0c\u5247\u6703\u5f15\u767c `TypeError`\u3002\u8acb\u78ba\u4fdd\u50b3\u5165\u7684\u53c3\u6578\u6b63\u78ba\u3002
\n2. **AttributeError**\uff1a\u82e5 `subclass` \u6c92\u6709 `do_something()` \u65b9\u6cd5\uff0c\u5247\u6703\u5f15\u767c `AttributeError`\u3002\u5728\u547c\u53eb\u65b9\u6cd5\u4e4b\u524d\uff0c\u61c9\u78ba\u4fdd\u7269\u4ef6\u64c1\u6709\u8a72\u65b9\u6cd5\u3002<\/p>\n
## \u5ef6\u4f38\u61c9\u7528<\/p>\n
`subclasshook()` \u4e0d\u50c5\u9650\u65bc\u57fa\u672c\u7684\u985e\u5225\u6aa2\u67e5\uff0c\u9084\u53ef\u4ee5\u7528\u65bc\u8907\u96dc\u7684\u7269\u4ef6\u5c0e\u5411\u7a0b\u5f0f\u8a2d\u8a08\u4e2d\uff0c\u4f8b\u5982\u5728\u958b\u767c\u6846\u67b6\u6642\u81ea\u52d5\u9a57\u8b49\u7269\u4ef6\u985e\u578b\u3002\u9019\u53ef\u4ee5\u63d0\u5347\u4ee3\u78bc\u7684\u53ef\u8b80\u6027\u8207\u53ef\u7dad\u8b77\u6027\u3002<\/p>\n
\u82e5\u60f3\u6df1\u5165\u4e86\u89e3\u66f4\u591a Python \u7684\u9ad8\u7d1a\u7279\u6027\uff0c\u6b61\u8fce\u53c3\u8003 [\u9019\u88e1\u7684\u6559\u5b78\u6587\u7ae0](https:\/\/vocus.cc\/article\/608c1cbd8fd1a80001d4b123)\uff01<\/p>\n
## \u5e38\u898b\u554f\u984c\u89e3\u7b54 (Q&A)<\/p>\n
### Q1: `subclasshook()` \u4ec0\u9ebc\u6642\u5019\u6703\u7528\u5230\uff1f
\nA: \u7576\u4f60\u9700\u8981\u9a57\u8b49\u4e00\u500b\u7269\u4ef6\u662f\u5426\u70ba\u7279\u5b9a\u985e\u5225\u7684\u5b50\u985e\u5225\u6642\uff0c`subclasshook()` \u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u7279\u5225\u662f\u5728\u7269\u4ef6\u5c0e\u5411\u8a2d\u8a08\u4e2d\u3002<\/p>\n
### Q2: \u5982\u4f55\u8655\u7406 `subclasshook()` \u7684\u932f\u8aa4\uff1f
\nA: \u78ba\u4fdd\u50b3\u5165\u7684\u53c3\u6578\u985e\u578b\u6b63\u78ba\uff0c\u4e26\u5728\u8abf\u7528\u65b9\u6cd5\u4e4b\u524d\u9a57\u8b49\u7269\u4ef6\u662f\u5426\u64c1\u6709\u8a72\u65b9\u6cd5\u3002<\/p>\n
### Q3: `subclasshook()` \u53ef\u4ee5\u7528\u65bc\u4efb\u4f55\u985e\u5225\u55ce\uff1f
\nA: \u662f\u7684\uff0c`subclasshook()` \u53ef\u4ee5\u7528\u65bc\u4efb\u4f55\u7e7c\u627f\u81ea Python \u57fa\u790e\u985e\u5225\u7684\u985e\u5225\uff0c\u9019\u4f7f\u5f97\u5176\u9069\u7528\u6027\u76f8\u7576\u5ee3\u6cdb\u3002<\/p>\n
—<\/p>\n
\u9019\u6a23\u7684\u512a\u5316\u4e0d\u50c5\u66f4\u65b0\u4e86\u5167\u5bb9\uff0c\u9084\u9075\u5faa\u4e86 SEO \u7684\u6700\u4f73\u5be6\u8e10\uff0c\u4e26\u589e\u52a0\u4e86\u5be6\u7528\u6027\u8207\u53ef\u8b80\u6027\u3002<\/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-3362","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-Se","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3362","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=3362"}],"version-history":[{"count":1,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3362\/revisions"}],"predecessor-version":[{"id":3363,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3362\/revisions\/3363"}],"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=3362"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3362"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}