{"id":1345,"date":"2025-02-19T16:52:49","date_gmt":"2025-02-19T08:52:49","guid":{"rendered":"http:\/\/www.chan.ink\/?p=1345"},"modified":"2025-02-19T16:52:52","modified_gmt":"2025-02-19T08:52:52","slug":"%e3%80%90django%e3%80%91__call__%e8%a2%ab%e8%b0%83%e7%94%a8%e7%9a%84%e6%97%b6%e6%9c%ba","status":"publish","type":"post","link":"http:\/\/www.chan.ink\/index.php\/2025\/02\/19\/%e3%80%90django%e3%80%91__call__%e8%a2%ab%e8%b0%83%e7%94%a8%e7%9a%84%e6%97%b6%e6%9c%ba\/","title":{"rendered":"\u3010Django\u3011__call__\u88ab\u8c03\u7528\u7684\u65f6\u673a"},"content":{"rendered":"\n

\u975e\u5e38\u597d\u7684\u95ee\u9898\uff01__init__<\/code> \u548c __call__<\/code> \u662f Python \u4e2d\u4e24\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u7279\u6b8a\u65b9\u6cd5\uff0c\u4f46\u5b83\u4eec\u7684\u884c\u4e3a\u548c\u89e6\u53d1\u6761\u4ef6\u5b8c\u5168\u4e0d\u540c\u3002\u4e0b\u9762\u6211\u4f1a\u8be6\u7ec6\u89e3\u91ca\u5b83\u4eec\u7684\u6267\u884c\u5951\u673a\u548c\u89e6\u53d1\u6761\u4ef6\u3002<\/p>\n\n\n\n

\n\n\n\n

1. __init__<\/code> \u65b9\u6cd5<\/h3>\n\n\n\n

\u89e6\u53d1\u6761\u4ef6\uff1a<\/h4>\n\n\n\n
    \n
  • __init__<\/code> \u65b9\u6cd5\u5728\u521b\u5efa\u5bf9\u8c61\u65f6\u81ea\u52a8\u8c03\u7528<\/strong>\uff0c\u4e5f\u5c31\u662f\u5728\u7c7b\u7684\u5b9e\u4f8b\u5316\u8fc7\u7a0b\u4e2d\u6267\u884c\u3002<\/li>\n<\/ul>\n\n\n\n

    \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
    class MyClass:\n    def __init__(self, value):\n        print(\"__init__ \u88ab\u8c03\u7528\")\n        self.value = value\n\n# \u521b\u5efa\u5bf9\u8c61\u65f6\uff0c__init__ \u81ea\u52a8\u6267\u884c\nobj = MyClass(10)<\/code><\/pre>\n\n\n\n
    \u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n
    __init__ \u88ab\u8c03\u7528<\/code><\/pre>\n\n\n\n
      \n
    • \u5f53\u4f60\u6267\u884c obj = MyClass(10)<\/code> \u65f6\uff0cPython \u4f1a\u81ea\u52a8\u8c03\u7528 __init__<\/code> \u65b9\u6cd5\uff0c\u521d\u59cb\u5316\u5bf9\u8c61\u7684\u72b6\u6001\u3002<\/li>\n<\/ul>\n\n\n\n
      \u603b\u7ed3\uff1a<\/h4>\n\n\n\n
        \n
      • __init__<\/code> \u662f\u5bf9\u8c61\u7684\u6784\u9020\u51fd\u6570\uff0c\u7528\u4e8e\u521d\u59cb\u5316\u5bf9\u8c61\u7684\u5c5e\u6027\u3002<\/li>\n\n\n\n
      • \u5b83\u5728\u5bf9\u8c61\u521b\u5efa\u65f6\u81ea\u52a8\u8c03\u7528\uff0c\u4e14\u53ea\u8c03\u7528\u4e00\u6b21\u3002<\/li>\n<\/ul>\n\n\n\n
        \n\n\n\n
        2. __call__<\/code> \u65b9\u6cd5<\/h3>\n\n\n\n
        \u89e6\u53d1\u6761\u4ef6\uff1a<\/h4>\n\n\n\n
          \n
        • __call__<\/code> \u65b9\u6cd5\u5728\u5bf9\u8c61\u88ab\u50cf\u51fd\u6570\u4e00\u6837\u8c03\u7528\u65f6\u89e6\u53d1<\/strong>\uff0c\u4e5f\u5c31\u662f\u5f53\u4f60\u4f7f\u7528 \u5bf9\u8c61()<\/code> \u7684\u8bed\u6cd5\u65f6\u3002<\/li>\n<\/ul>\n\n\n\n
          \u793a\u4f8b\uff1a<\/h4>\n\n\n\n
          class MyClass:\n    def __init__(self, value):\n        print(\"__init__ \u88ab\u8c03\u7528\")\n        self.value = value\n\n    def __call__(self, x):\n        print(\"__call__ \u88ab\u8c03\u7528\")\n        return self.value + x\n\n# \u521b\u5efa\u5bf9\u8c61\nobj = MyClass(10)\n\n# \u8c03\u7528\u5bf9\u8c61\nresult = obj(5)  # \u8fd9\u91cc\u4f1a\u89e6\u53d1 __call__ \u65b9\u6cd5\nprint(result)<\/code><\/pre>\n\n\n\n
          \u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n
          __init__ \u88ab\u8c03\u7528\n__call__ \u88ab\u8c03\u7528\n15<\/code><\/pre>\n\n\n\n
            \n
          • \u5f53\u4f60\u6267\u884c obj(5)<\/code> \u65f6\uff0cPython \u4f1a\u8c03\u7528 obj.__call__(5)<\/code>\uff0c\u4ece\u800c\u89e6\u53d1 __call__<\/code> \u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n
            \u603b\u7ed3\uff1a<\/h4>\n\n\n\n
              \n
            • __call__<\/code> \u65b9\u6cd5\u4f7f\u5bf9\u8c61\u53ef\u4ee5\u50cf\u51fd\u6570\u4e00\u6837\u88ab\u8c03\u7528\u3002<\/li>\n\n\n\n
            • \u5b83\u7684\u89e6\u53d1\u6761\u4ef6\u662f\u4f7f\u7528 \u5bf9\u8c61()<\/code> \u7684\u8bed\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n
              \n\n\n\n
              3. __init__<\/code> \u548c __call__<\/code> \u7684\u533a\u522b<\/h3>\n\n\n\n
              \u7279\u6027<\/th>__init__<\/code><\/th>__call__<\/code><\/th><\/tr><\/thead>
              \u89e6\u53d1\u6761\u4ef6<\/strong><\/td>\u5bf9\u8c61\u521b\u5efa\u65f6\u81ea\u52a8\u8c03\u7528<\/td>\u5bf9\u8c61\u88ab\u50cf\u51fd\u6570\u4e00\u6837\u8c03\u7528\u65f6\u89e6\u53d1<\/td><\/tr>
              \u8c03\u7528\u6b21\u6570<\/strong><\/td>\u6bcf\u4e2a\u5bf9\u8c61\u53ea\u8c03\u7528\u4e00\u6b21<\/td>\u53ef\u4ee5\u591a\u6b21\u8c03\u7528<\/td><\/tr>
              \u4e3b\u8981\u7528\u9014<\/strong><\/td>\u521d\u59cb\u5316\u5bf9\u8c61\u5c5e\u6027<\/td>\u4f7f\u5bf9\u8c61\u53ef\u4ee5\u50cf\u51fd\u6570\u4e00\u6837\u88ab\u8c03\u7528<\/td><\/tr>
              \u793a\u4f8b<\/strong><\/td>obj = MyClass(10)<\/code><\/td>obj(5)<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
              \n\n\n\n
              4. __call__<\/code> \u7684\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h3>\n\n\n\n
              __call__<\/code> \u65b9\u6cd5\u5728 Python \u4e2d\u6709\u5f88\u591a\u5b9e\u9645\u5e94\u7528\u573a\u666f\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n
              \uff081\uff09\u5b9e\u73b0\u51fd\u6570\u5bf9\u8c61<\/strong><\/h4>\n\n\n\n
              class Adder:\n    def __init__(self, n):\n        self.n = n\n\n    def __call__(self, x):\n        return self.n + x\n\nadd_five = Adder(5)\nprint(add_five(10))  # \u8f93\u51fa: 15<\/code><\/pre>\n\n\n\n
                \n
              • \u8fd9\u91cc Adder<\/code> \u7684\u5b9e\u4f8b add_five<\/code> \u53ef\u4ee5\u50cf\u51fd\u6570\u4e00\u6837\u88ab\u8c03\u7528\u3002<\/li>\n<\/ul>\n\n\n\n
                \uff082\uff09\u5b9e\u73b0\u88c5\u9970\u5668<\/strong><\/h4>\n\n\n\n
                \u88c5\u9970\u5668\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u53ef\u8c03\u7528\u7684\u5bf9\u8c61\uff0c\u901a\u5e38\u901a\u8fc7 __call__<\/code> \u65b9\u6cd5\u5b9e\u73b0\u3002<\/p>\n\n\n\n
                class Logger:\n    def __init__(self, func):\n        self.func = func\n\n    def __call__(self, *args, **kwargs):\n        print(f\"\u8c03\u7528\u51fd\u6570: {self.func.__name__}\")\n        return self.func(*args, **kwargs)\n\n@Logger\ndef say_hello(name):\n    print(f\"Hello, {name}!\")\n\nsay_hello(\"Alice\")<\/code><\/pre>\n\n\n\n
                \u8f93\u51fa<\/strong>\uff1a<\/p>\n\n\n\n
                \u8c03\u7528\u51fd\u6570: say_hello\nHello, Alice!<\/code><\/pre>\n\n\n\n
                  \n
                • \u8fd9\u91cc Logger<\/code> \u7c7b\u901a\u8fc7 __call__<\/code> \u65b9\u6cd5\u5b9e\u73b0\u4e86\u88c5\u9970\u5668\u7684\u529f\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n
                  \uff083\uff09Django \u4e2d\u95f4\u4ef6<\/strong><\/h4>\n\n\n\n
                  \u5728 Django \u4e2d\uff0c\u4e2d\u95f4\u4ef6\u7c7b\u901a\u5e38\u901a\u8fc7 __call__<\/code> \u65b9\u6cd5\u5904\u7406\u8bf7\u6c42\u548c\u54cd\u5e94\u3002<\/p>\n\n\n\n
                  class SimpleMiddleware:\n    def __init__(self, get_response):\n        self.get_response = get_response\n\n    def __call__(self, request):\n        print(\"\u5904\u7406\u8bf7\u6c42\u524d\")\n        response = self.get_response(request)\n        print(\"\u5904\u7406\u54cd\u5e94\u540e\")\n        return response<\/code><\/pre>\n\n\n\n
                    \n
                  • \u5f53 Django \u5904\u7406\u8bf7\u6c42\u65f6\uff0c\u4f1a\u8c03\u7528\u4e2d\u95f4\u4ef6\u5b9e\u4f8b\u7684 __call__<\/code> \u65b9\u6cd5\u3002<\/li>\n<\/ul>\n\n\n\n
                    \n\n\n\n
                    5. \u603b\u7ed3<\/h3>\n\n\n\n
                      \n
                    • __init__<\/code> \u662f\u6784\u9020\u51fd\u6570\uff0c\u5728\u5bf9\u8c61\u521b\u5efa\u65f6\u81ea\u52a8\u8c03\u7528\uff0c\u7528\u4e8e\u521d\u59cb\u5316\u5bf9\u8c61\u3002<\/li>\n\n\n\n
                    • __call__<\/code> \u662f\u4f7f\u5bf9\u8c61\u53ef\u4ee5\u50cf\u51fd\u6570\u4e00\u6837\u88ab\u8c03\u7528\u7684\u65b9\u6cd5\uff0c\u89e6\u53d1\u6761\u4ef6\u662f\u4f7f\u7528 \u5bf9\u8c61()<\/code> \u7684\u8bed\u6cd5\u3002<\/li>\n\n\n\n
                    • __call__<\/code> \u7684\u5e94\u7528\u573a\u666f\u5305\u62ec\u5b9e\u73b0\u51fd\u6570\u5bf9\u8c61\u3001\u88c5\u9970\u5668\u3001Django \u4e2d\u95f4\u4ef6\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n
                      \u5982\u679c\u4f60\u8fd8\u6709\u5176\u4ed6\u95ee\u9898\uff0c\u6b22\u8fce\u7ee7\u7eed\u63d0\u95ee\uff01 ?<\/p>\n","protected":false},"excerpt":{"rendered":"
                      \u975e\u5e38\u597d\u7684\u95ee\u9898\uff01__init__ \u548c __call__ \u662f Python \u4e2d\u4e24\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u7279\u6b8a\u65b9\u6cd5\uff0c\u4f46\u5b83\u4eec\u7684\u884c\u4e3a […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1345","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts\/1345","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/comments?post=1345"}],"version-history":[{"count":1,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts\/1345\/revisions"}],"predecessor-version":[{"id":1346,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/posts\/1345\/revisions\/1346"}],"wp:attachment":[{"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/media?parent=1345"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/categories?post=1345"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.chan.ink\/index.php\/wp-json\/wp\/v2\/tags?post=1345"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}