{"id":3264,"date":"2025-05-30T15:48:52","date_gmt":"2025-06-04T08:24:52","guid":{"rendered":"https:\/\/badgameshow.com\/steven\/?p=3264"},"modified":"2025-06-04T15:48:52","modified_gmt":"2025-06-04T08:24:52","slug":"%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84classmethod%e5%87%bd%e6%95%b8-2","status":"publish","type":"post","link":"https:\/\/badgameshow.com\/steven\/python\/%e4%ba%86%e8%a7%a3python%e4%b8%ad%e7%9a%84classmethod%e5%87%bd%e6%95%b8-2\/","title":{"rendered":"\u6df1\u5165\u4e86\u89e3 Python \u4e2d\u7684 classmethod() \u51fd\u6578\uff1a2025 \u6700\u65b0\u8a9e\u6cd5\u8207\u6700\u4f73\u5be6\u8e10"},"content":{"rendered":"

<\/p>\n

\u6df1\u5165\u4e86\u89e3 Python \u4e2d\u7684 classmethod()<\/h1>\n

\u5728 Python \u4e2d\uff0c`classmethod()` \u662f\u4e00\u500b\u975e\u5e38\u5f37\u5927\u4e14\u5be6\u7528\u7684\u51fd\u5f0f\uff0c\u53ef\u4ee5\u8b93\u4f60\u5c07\u4e00\u500b\u51fd\u5f0f\u8a2d\u5b9a\u70ba\u985e\u5225\u65b9\u6cd5\uff0c\u800c\u4e0d\u662f\u7269\u4ef6\u65b9\u6cd5\u3002\u9019\u610f\u5473\u8457\u4f60\u53ef\u4ee5\u5728\u4e0d\u9700\u8981\u5be6\u4f8b\u5316\u7269\u4ef6\u7684\u60c5\u6cc1\u4e0b\uff0c\u76f4\u63a5\u4f7f\u7528\u985e\u5225\u65b9\u6cd5\u3002\u9019\u5c0d\u65bc\u9700\u8981\u5728\u985e\u5225\u5c64\u7d1a\u4e0a\u9032\u884c\u64cd\u4f5c\u7684\u60c5\u6cc1\u975e\u5e38\u6709\u5e6b\u52a9\u3002<\/p>\n

classmethod() \u7684\u4f7f\u7528\u65b9\u6cd5<\/h2>\n

\u8981\u4f7f\u7528 `classmethod()`\uff0c\u4f60\u9700\u8981\u5728\u5b9a\u7fa9\u51fd\u5f0f\u6642\uff0c\u5c07\u5b83\u6a19\u8a18\u70ba `@classmethod`\uff0c\u4f8b\u5982\uff1a<\/p>\n

“`python
\nclass MyClass:
\n @classmethod
\n def my_method(cls):
\n print(“This is a class method”)
\n“`<\/p>\n

\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5b9a\u7fa9\u4e86\u4e00\u500b\u540d\u70ba `my_method` \u7684\u985e\u5225\u65b9\u6cd5\uff0c\u5b83\u6703\u5370\u51fa\u4e00\u500b\u5b57\u4e32\u3002\u8981\u547c\u53eb\u9019\u500b\u985e\u5225\u65b9\u6cd5\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u985e\u5225\u540d\u7a31\uff0c\u800c\u4e0d\u662f\u7269\u4ef6\u540d\u7a31\uff0c\u4f8b\u5982\uff1a<\/p>\n

“`python
\nMyClass.my_method()
\n“`<\/p>\n

\u9019\u6a23\u5c31\u53ef\u4ee5\u57f7\u884c `my_method` \u9019\u500b\u985e\u5225\u65b9\u6cd5\uff0c\u800c\u4e0d\u9700\u8981\u5148\u5be6\u4f8b\u5316\u7269\u4ef6\u3002<\/p>\n

classmethod() \u7684\u512a\u9ede<\/h2>\n

\u4f7f\u7528 `classmethod()` \u6709\u5e7e\u500b\u4e3b\u8981\u512a\u9ede\uff1a<\/p>\n

1. **\u4e0d\u9700\u8981\u5be6\u4f8b\u5316\u7269\u4ef6**\uff1a\u4f60\u53ef\u4ee5\u76f4\u63a5\u900f\u904e\u985e\u5225\u540d\u7a31\u547c\u53eb\u985e\u5225\u65b9\u6cd5\uff0c\u9019\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\u53ef\u4ee5\u7c21\u5316\u4ee3\u78bc\u7d50\u69cb\u3002
\n2. **\u66f4\u597d\u7684\u7dad\u8b77\u6027**\uff1a\u5728\u4e0d\u540c\u7684\u985e\u5225\u4e2d\uff0c\u4f7f\u7528\u76f8\u540c\u7684\u51fd\u5f0f\u540d\u7a31\u800c\u4e0d\u6703\u7522\u751f\u885d\u7a81\uff0c\u9019\u6709\u52a9\u65bc\u63d0\u9ad8\u7a0b\u5f0f\u78bc\u7684\u6e05\u6670\u5ea6\u3002
\n3. **\u6613\u65bc\u64f4\u5c55**\uff1a\u7576\u4f60\u9700\u8981\u64f4\u5c55\u985e\u5225\u529f\u80fd\u6642\uff0c\u985e\u5225\u65b9\u6cd5\u53ef\u4ee5\u88ab\u5b50\u985e\u5225\u7e7c\u627f\u4e26\u91cd\u5beb\uff0c\u9019\u5c0d\u65bc\u591a\u614b\u6027\u975e\u5e38\u6709\u7528\u3002<\/p>\n

\u5be6\u4f5c\u7bc4\u4f8b<\/h2>\n

\u4ee5\u4e0b\u662f\u4e00\u500b\u66f4\u5b8c\u6574\u7684\u7bc4\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u4f7f\u7528 `classmethod()` \u4f86\u7ba1\u7406\u5c0d\u8c61\u6578\u91cf\uff1a<\/p>\n

“`python
\nclass MyClass:
\n instance_count = 0<\/p>\n

def __init__(self):
\n MyClass.instance_count += 1<\/p>\n

@classmethod
\n def get_instance_count(cls):
\n return cls.instance_count<\/p>\n

# \u5275\u5efa\u5e7e\u500b\u5be6\u4f8b
\nobj1 = MyClass()
\nobj2 = MyClass()<\/p>\n

# \u7372\u53d6\u5be6\u4f8b\u6578\u91cf
\nprint(MyClass.get_instance_count()) # \u8f38\u51fa: 2
\n“`<\/p>\n

\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u7528 `get_instance_count` \u9019\u500b\u985e\u5225\u65b9\u6cd5\u4f86\u8ffd\u8e64\u5be6\u4f8b\u7684\u6578\u91cf\u3002<\/p>\n

\u932f\u8aa4\u6392\u9664<\/h2>\n

\u5982\u679c\u4f60\u5728\u4f7f\u7528 `classmethod()` \u6642\u9047\u5230\u554f\u984c\uff0c\u9019\u88e1\u6709\u5e7e\u500b\u5e38\u898b\u7684\u932f\u8aa4\u53ca\u5176\u89e3\u6c7a\u65b9\u6cd5\uff1a<\/p>\n

– **\u932f\u8aa4\u4f7f\u7528 `self`**\uff1a\u5728\u985e\u5225\u65b9\u6cd5\u4e2d\uff0c\u61c9\u4f7f\u7528 `cls` \u800c\u975e `self` \u4f86\u5f15\u7528\u985e\u5225\u3002
\n– **\u672a\u4f7f\u7528 `@classmethod` \u88dd\u98fe\u5668**\uff1a\u78ba\u4fdd\u5728\u51fd\u5f0f\u5b9a\u7fa9\u524d\u4f7f\u7528 `@classmethod` \u88dd\u98fe\u5668\uff0c\u5426\u5247\u51fd\u5f0f\u5c07\u4e0d\u6703\u88ab\u8b58\u5225\u70ba\u985e\u5225\u65b9\u6cd5\u3002<\/p>\n

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

`classmethod()` \u4e0d\u50c5\u9069\u7528\u65bc\u8ffd\u8e64\u5be6\u4f8b\u6578\u91cf\uff0c\u4e5f\u53ef\u4ee5\u7528\u65bc\u5275\u5efa\u5de5\u5ee0\u65b9\u6cd5\uff0c\u9019\u4e9b\u65b9\u6cd5\u53ef\u4ee5\u6839\u64da\u4e0d\u540c\u7684\u53c3\u6578\u8fd4\u56de\u985e\u5225\u7684\u4e0d\u540c\u5be6\u4f8b\u3002\u4f8b\u5982\uff1a<\/p>\n

“`python
\nclass Shape:
\n @classmethod
\n def create_square(cls, side_length):
\n return cls(side_length, side_length)<\/p>\n

# \u7528\u985e\u5225\u65b9\u6cd5\u5275\u5efa\u6b63\u65b9\u5f62
\nsquare = Shape.create_square(5)
\n“`<\/p>\n

\u9019\u6a23\u7684\u8a2d\u8a08\u53ef\u4ee5\u8b93\u4f60\u7684\u985e\u5225\u66f4\u52a0\u9748\u6d3b\uff0c\u4e26\u4e14\u80fd\u5920\u6839\u64da\u9700\u6c42\u5275\u5efa\u7279\u5b9a\u7684\u5c0d\u8c61\u3002<\/p>\n

\u7d50\u8ad6<\/h2>\n

\u5728 Python \u4e2d\uff0c\u4f7f\u7528 `classmethod()` \u53ef\u4ee5\u8b93\u4f60\u66f4\u6709\u6548\u5730\u64cd\u4f5c\u985e\u5225\uff0c\u800c\u4e0d\u9700\u8981\u5be6\u4f8b\u5316\u7269\u4ef6\u3002\u5b83\u4e0d\u50c5\u63d0\u9ad8\u4e86\u7a0b\u5f0f\u78bc\u7684\u7d50\u69cb\u6027\uff0c\u4e5f\u589e\u5f37\u4e86\u7dad\u8b77\u6027\u548c\u53ef\u64f4\u5c55\u6027\u3002\u96a8\u8457 Python \u7684\u4e0d\u65b7\u66f4\u65b0\uff0c\u638c\u63e1\u9019\u4e9b\u6982\u5ff5\u5c0d\u65bc\u958b\u767c\u8005\u4f86\u8aaa\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n

\u5982\u9700\u4e86\u89e3\u66f4\u591a Python \u7a0b\u5f0f\u6559\u5b78\uff0c\u8acb\u53c3\u8003 [\u9019\u88e1](https:\/\/vocus.cc) \u7684\u76f8\u95dc\u6559\u5b78\u6587\u7ae0\u3002<\/p>\n

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

**Q1: classmethod \u548c staticmethod \u6709\u4ec0\u9ebc\u4e0d\u540c\uff1f**
\nA1: `classmethod` \u9700\u8981\u4e00\u500b\u985e\u5225\u4f5c\u70ba\u7b2c\u4e00\u500b\u53c3\u6578\uff0c\u800c `staticmethod` \u5247\u4e0d\u9700\u8981\u3002`classmethod` \u53ef\u4ee5\u64cd\u4f5c\u985e\u5225\u7684\u72c0\u614b\uff0c\u800c `staticmethod` \u53ea\u662f\u8207\u985e\u5225\u76f8\u95dc\u7684\u666e\u901a\u51fd\u5f0f\uff0c\u4e0d\u8a2a\u554f\u985e\u5225\u6216\u5be6\u4f8b\u7684\u72c0\u614b\u3002<\/p>\n

**Q2: \u4f55\u6642\u61c9\u8a72\u4f7f\u7528 classmethod\uff1f**
\nA2: \u7576\u4f60\u9700\u8981\u5275\u5efa\u985e\u5225\u5c64\u7d1a\u7684\u64cd\u4f5c\uff0c\u6216\u9700\u8981\u5c0d\u985e\u5225\u7684\u72c0\u614b\u9032\u884c\u7ba1\u7406\u6642\uff0c\u61c9\u4f7f\u7528 `classmethod`\u3002\u4f8b\u5982\uff0c\u7576\u5be6\u73fe\u5de5\u5ee0\u65b9\u6cd5\u6216\u8a08\u7b97\u985e\u5225\u5c64\u7d1a\u7684\u7d71\u8a08\u6642\u3002<\/p>\n

**Q3: \u5982\u4f55\u5728\u5b50\u985e\u5225\u4e2d\u4f7f\u7528\u7236\u985e\u5225\u7684 classmethod\uff1f**
\nA3: \u5728\u5b50\u985e\u5225\u4e2d\uff0c\u4f60\u53ef\u4ee5\u76f4\u63a5\u547c\u53eb\u7236\u985e\u5225\u7684 `classmethod`\uff0c\u4e5f\u53ef\u4ee5\u91cd\u5beb\u5b83\u4ee5\u63d0\u4f9b\u66f4\u5177\u9ad4\u7684\u5be6\u73fe\u3002\u9019\u6a23\u53ef\u4ee5\u4fdd\u6301\u591a\u614b\u6027\uff0c\u8b93\u5b50\u985e\u5225\u4f9d\u7136\u80fd\u5920\u4f7f\u7528\u7236\u985e\u5225\u7684\u529f\u80fd\u3002<\/p>\n

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

\u4e86\u89e3Python\u4e2d\u7684Classmethod()\u51fd\u6578\uff0c\u5b83\u53ef\u4ee5\u8b93\u4f60\u5728\u985e\u5225\u4e2d\u5b9a\u7fa9\u975c\u614b\u65b9\u6cd5\uff0c\u4e26\u4e14\u53ef\u4ee5\u8b93\u4f60\u5728\u985e\u5225\u4e2d\u5b9a\u7fa9\u53ef\u4ee5\u88ab\u5b50\u985e\u5225\u7e7c\u627f\u7684\u65b9\u6cd5\u3002\u9019\u7bc7\u6587\u7ae0\u5c07\u6703\u8a73\u7d30\u4ecb\u7d39Classmethod()\u51fd\u6578\u7684\u4f7f\u7528\u65b9\u6cd5\uff0c\u4ee5\u53ca\u5b83\u7684\u512a\u9ede\u548c\u7f3a\u9ede\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-3264","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-QE","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3264","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=3264"}],"version-history":[{"count":2,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3264\/revisions"}],"predecessor-version":[{"id":12885,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/posts\/3264\/revisions\/12885"}],"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=3264"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/categories?post=3264"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/badgameshow.com\/steven\/wp-json\/wp\/v2\/tags?post=3264"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}