{"id":1126078,"date":"2025-01-08T19:57:42","date_gmt":"2025-01-08T11:57:42","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1126078.html"},"modified":"2025-01-08T19:57:45","modified_gmt":"2025-01-08T11:57:45","slug":"python%e4%b8%ad%e5%a6%82%e4%bd%95%e7%94%a8type%e6%b5%8b%e8%af%95%e6%95%b0%e6%8d%ae%e7%b1%bb%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1126078.html","title":{"rendered":"python\u4e2d\u5982\u4f55\u7528type\u6d4b\u8bd5\u6570\u636e\u7c7b\u578b"},"content":{"rendered":"

\"python\u4e2d\u5982\u4f55\u7528type\u6d4b\u8bd5\u6570\u636e\u7c7b\u578b\"<\/p>\n

\u5728Python\u4e2d\uff0c\u7528type<\/code>\u51fd\u6570\u6d4b\u8bd5\u6570\u636e\u7c7b\u578b\u7684\u65b9\u6cd5\u5305\u62ec<\/strong>\uff1a\u8c03\u7528type<\/code>\u51fd\u6570\u3001\u4f7f\u7528isinstance<\/code>\u51fd\u6570\u3001\u7ed3\u5408type<\/code>\u51fd\u6570\u4e0e\u6761\u4ef6\u5224\u65ad\u3001\u4e0e\u5176\u4ed6\u5185\u7f6e\u51fd\u6570\u7ed3\u5408\u4f7f\u7528\u3002\u5728\u5f00\u53d1\u8fc7\u7a0b\u4e2d\uff0c\u786e\u4fdd\u4ee3\u7801\u7684\u7c7b\u578b\u5b89\u5168\u548c\u9884\u671f\u884c\u4e3a\u662f\u81f3\u5173\u91cd\u8981\u7684\uff0c\u4e0b\u9762\u5c06\u8be6\u7ec6\u63cf\u8ff0\u8fd9\u4e9b\u65b9\u6cd5\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u8c03\u7528type<\/code>\u51fd\u6570<\/h2>\n<\/p>\n

\u5728Python\u4e2d\uff0ctype<\/code>\u51fd\u6570\u662f\u6700\u57fa\u672c\u7684\u7528\u4e8e\u6d4b\u8bd5\u6570\u636e\u7c7b\u578b\u7684\u65b9\u6cd5\u3002\u901a\u8fc7\u8c03\u7528type<\/code>\u51fd\u6570\uff0c\u53ef\u4ee5\u8fd4\u56de\u5bf9\u8c61\u7684\u7c7b\u578b\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n

x = 10<\/p>\n
print(type(x))  # \u8f93\u51fa\uff1a<class 'int'><\/p>\n
y = "Hello"<\/p>\n
print(type(y))  # \u8f93\u51fa\uff1a<class 'str'><\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8c03\u7528type<\/code>\u51fd\u6570\u53ef\u4ee5\u76f4\u63a5\u8fd4\u56de\u5bf9\u8c61\u7684\u7c7b\u578b\uff0c\u5e38\u7528\u4e8e\u8c03\u8bd5\u548c\u7b80\u5355\u7684\u7c7b\u578b\u68c0\u67e5\u3002\u4f46\u662f\uff0c\u4f7f\u7528type<\/code>\u51fd\u6570\u65f6\u8981\u6ce8\u610f\uff1atype\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f\u7c7b\u578b\u5bf9\u8c61\uff0c\u800c\u4e0d\u662f\u5b57\u7b26\u4e32<\/strong>\u3002<\/p>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1atype\u51fd\u6570\u7684\u5c40\u9650\u6027<\/strong><\/h3>\n<\/p>\n
\u867d\u7136type<\/code>\u51fd\u6570\u5728\u7b80\u5355\u7684\u7c7b\u578b\u68c0\u67e5\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u4f46\u5728\u66f4\u590d\u6742\u7684\u573a\u666f\u4e2d\uff0c\u5b83\u53ef\u80fd\u4e0d\u591f\u7075\u6d3b\u3002\u4f8b\u5982\uff0c\u5f53\u6211\u4eec\u9700\u8981\u68c0\u67e5\u4e00\u4e2a\u5bf9\u8c61\u662f\u5426\u662f\u67d0\u4e2a\u7c7b\u7684\u5b50\u7c7b\u65f6\uff0ctype<\/code>\u51fd\u6570\u5c31\u663e\u5f97\u6709\u4e9b\u529b\u4e0d\u4ece\u5fc3\u3002\u6b64\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528isinstance<\/code>\u51fd\u6570\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528isinstance<\/code>\u51fd\u6570<\/h2>\n<\/p>\n
isinstance<\/code>\u51fd\u6570\u662f\u53e6\u4e00\u79cd\u68c0\u67e5\u5bf9\u8c61\u7c7b\u578b\u7684\u65b9\u6cd5\uff0c\u5b83\u4e0d\u4ec5\u53ef\u4ee5\u68c0\u67e5\u5bf9\u8c61\u7684\u76f4\u63a5\u7c7b\u578b\uff0c\u8fd8\u53ef\u4ee5\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u662f\u67d0\u4e2a\u7c7b\u7684\u5b50\u7c7b<\/strong>\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
class Animal:<\/p>\n
    pass<\/p>\n
class Dog(Animal):<\/p>\n
    pass<\/p>\n
d = Dog()<\/p>\n
print(isinstance(d, Dog))       # \u8f93\u51fa\uff1aTrue<\/p>\n
print(isinstance(d, Animal))    # \u8f93\u51fa\uff1aTrue<\/p>\n
print(isinstance(d, object))    # \u8f93\u51fa\uff1aTrue<\/p>\n
<\/code><\/pre>\n<\/p>\n
isinstance<\/code>\u51fd\u6570\u6709\u4e24\u4e2a\u53c2\u6570\uff1a\u7b2c\u4e00\u4e2a\u662f\u9700\u8981\u68c0\u67e5\u7684\u5bf9\u8c61\uff0c\u7b2c\u4e8c\u4e2a\u662f\u7c7b\u578b\u6216\u8005\u7c7b\u578b\u7684\u5143\u7ec4\u3002\u5982\u679c\u5bf9\u8c61\u662f\u53c2\u6570\u4e2d\u4efb\u610f\u4e00\u4e2a\u7c7b\u578b\u7684\u5b9e\u4f8b\uff0c\u51fd\u6570\u8fd4\u56deTrue\uff0c\u5426\u5219\u8fd4\u56deFalse\u3002<\/p>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1aisinstance\u51fd\u6570\u7684\u4f18\u52bf<\/strong><\/h3>\n<\/p>\n
\u4e0etype<\/code>\u51fd\u6570\u76f8\u6bd4\uff0cisinstance<\/code>\u51fd\u6570\u66f4\u4e3a\u7075\u6d3b\uff0c\u5c24\u5176\u5728\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\u3002\u5b83\u5141\u8bb8\u6211\u4eec\u68c0\u67e5\u5bf9\u8c61\u662f\u5426\u662f\u67d0\u4e2a\u7c7b\u7684\u5b9e\u4f8b\uff0c\u5373\u4f7f\u8be5\u5bf9\u8c61\u662f\u901a\u8fc7\u7ee7\u627f\u521b\u5efa\u7684\u5b50\u7c7b\u5b9e\u4f8b<\/strong>\u3002\u8fd9\u4f7f\u5f97isinstance<\/code>\u51fd\u6570\u5728\u9700\u8981\u5904\u7406\u591a\u6001\u6027\u65f6\u663e\u5f97\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u7ed3\u5408type<\/code>\u51fd\u6570\u4e0e\u6761\u4ef6\u5224\u65ad<\/h2>\n<\/p>\n
\u5728\u4e00\u4e9b\u573a\u666f\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u6839\u636e\u7c7b\u578b\u6267\u884c\u4e0d\u540c\u7684\u64cd\u4f5c\uff0c\u6b64\u65f6\u53ef\u4ee5\u7ed3\u5408type<\/code>\u51fd\u6570\u4e0e\u6761\u4ef6\u5224\u65ad\u6765\u5b9e\u73b0\u3002\u4f8b\u5982\uff1a<\/p>\n<\/p>\n
def process_data(data):<\/p>\n
    if type(data) == int:<\/p>\n
        print("Processing integer")<\/p>\n
    elif type(data) == str:<\/p>\n
        print("Processing string")<\/p>\n
    else:<\/p>\n
        print("Unsupported type")<\/p>\n
process_data(10)       # \u8f93\u51fa\uff1aProcessing integer<\/p>\n
process_data("Hello")  # \u8f93\u51fa\uff1aProcessing string<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u7b80\u5355\u7684\u7c7b\u578b\u5206\u652f\u5904\u7406<\/strong>\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u4e0d\u5efa\u8bae\u5728\u590d\u6742\u9879\u76ee\u4e2d\u5927\u91cf\u4f7f\u7528\uff0c\u56e0\u4e3a\u8fd9\u53ef\u80fd\u5bfc\u81f4\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u964d\u4f4e\u3002<\/p>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a\u4f7f\u7528type<\/code>\u51fd\u6570\u4e0e\u6761\u4ef6\u5224\u65ad\u7684\u573a\u666f<\/strong><\/h3>\n<\/p>\n
\u5728\u5c0f\u578b\u9879\u76ee\u6216\u811a\u672c\u4e2d\uff0c\u7ed3\u5408type<\/code>\u51fd\u6570\u4e0e\u6761\u4ef6\u5224\u65ad\u53ef\u4ee5\u5feb\u901f\u5b9e\u73b0\u7c7b\u578b\u68c0\u67e5\u548c\u5904\u7406<\/strong>\u3002\u4f8b\u5982\uff0c\u5728\u6570\u636e\u5904\u7406\u811a\u672c\u4e2d\uff0c\u6839\u636e\u4e0d\u540c\u7684\u6570\u636e\u7c7b\u578b\u6267\u884c\u4e0d\u540c\u7684\u9884\u5904\u7406\u64cd\u4f5c\u3002\u7136\u800c\uff0c\u5728\u5927\u578b\u9879\u76ee\u4e2d\uff0c\u63a8\u8350\u4f7f\u7528\u66f4\u7075\u6d3b\u548c\u53ef\u6269\u5c55\u7684\u65b9\u6cd5\uff0c\u5982\u591a\u6001\u548c\u8bbe\u8ba1\u6a21\u5f0f\u3002<\/p>\n<\/p>\n
\u56db\u3001\u4e0e\u5176\u4ed6\u5185\u7f6e\u51fd\u6570\u7ed3\u5408\u4f7f\u7528<\/h2>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u5c06type<\/code>\u51fd\u6570\u4e0e\u5176\u4ed6\u5185\u7f6e\u51fd\u6570\u7ed3\u5408\u4f7f\u7528\uff0c\u4ee5\u5b9e\u73b0\u66f4\u590d\u6742\u7684\u7c7b\u578b\u68c0\u67e5\u3002\u4f8b\u5982\uff0c\u7ed3\u5408issubclass<\/code>\u51fd\u6570\uff1a<\/p>\n<\/p>\n
class Base:<\/p>\n
    pass<\/p>\n
class Derived(Base):<\/p>\n
    pass<\/p>\n
print(issubclass(Derived, Base))  # \u8f93\u51fa\uff1aTrue<\/p>\n
print(issubclass(Base, object))   # \u8f93\u51fa\uff1aTrue<\/p>\n
<\/code><\/pre>\n<\/p>\n
issubclass<\/code>\u51fd\u6570\u7528\u4e8e\u68c0\u67e5\u4e00\u4e2a\u7c7b\u662f\u5426\u662f\u53e6\u4e00\u4e2a\u7c7b\u7684\u5b50\u7c7b\uff0c\u5b83\u5728\u7c7b\u578b\u68c0\u67e5\u548c\u7ee7\u627f\u5173\u7cfb\u5904\u7406\u4e2d\u975e\u5e38\u6709\u7528<\/strong>\u3002<\/p>\n<\/p>\n
\u8be6\u7ec6\u63cf\u8ff0\uff1a\u7ed3\u5408\u4f7f\u7528\u5185\u7f6e\u51fd\u6570\u7684\u4f18\u52bf<\/strong><\/h3>\n<\/p>\n
\u4e0e\u5176\u4ed6\u5185\u7f6e\u51fd\u6570\u7ed3\u5408\u4f7f\u7528\u53ef\u4ee5\u5b9e\u73b0\u66f4\u590d\u6742\u548c\u7ec6\u81f4\u7684\u7c7b\u578b\u68c0\u67e5\u3002\u4f8b\u5982\uff0c\u5728\u5904\u7406\u590d\u6742\u7684\u7c7b\u5c42\u6b21\u7ed3\u6784\u65f6\uff0c\u7ed3\u5408type<\/code>\u3001isinstance<\/code>\u548cissubclass<\/code>\u51fd\u6570\uff0c\u53ef\u4ee5\u5b9e\u73b0\u66f4\u7075\u6d3b\u548c\u5f3a\u5927\u7684\u7c7b\u578b\u68c0\u67e5\u548c\u5904\u7406\u903b\u8f91\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u5b9e\u9645\u5e94\u7528\u573a\u666f<\/h2>\n<\/p>\n
\u5728\u5b9e\u9645\u9879\u76ee\u4e2d\uff0c\u7c7b\u578b\u68c0\u67e5\u548c\u7c7b\u578b\u5b89\u5168\u662f\u975e\u5e38\u91cd\u8981\u7684\uff0c\u5c24\u5176\u5728\u5927\u578b\u9879\u76ee\u4e2d\u3002\u901a\u8fc7\u5408\u7406\u4f7f\u7528type<\/code>\u3001isinstance<\/code>\u548cissubclass<\/code>\u7b49\u51fd\u6570\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5b9e\u9645\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n
1\u3001\u6570\u636e\u9a8c\u8bc1<\/strong><\/h3>\n<\/p>\n
\u5728\u5904\u7406\u7528\u6237\u8f93\u5165\u6216\u5916\u90e8\u6570\u636e\u65f6\uff0c\u786e\u4fdd\u6570\u636e\u7c7b\u578b\u7b26\u5408\u9884\u671f\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u5728Web\u5e94\u7528\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528isinstance<\/code>\u68c0\u67e5\u7528\u6237\u63d0\u4ea4\u7684\u6570\u636e\u7c7b\u578b\uff1a<\/p>\n<\/p>\n
def validate_user_input(data):<\/p>\n
    if isinstance(data, str):<\/p>\n
        # \u5904\u7406\u5b57\u7b26\u4e32\u8f93\u5165<\/p>\n
        pass<\/p>\n
    elif isinstance(data, int):<\/p>\n
        # \u5904\u7406\u6574\u6570\u8f93\u5165<\/p>\n
        pass<\/p>\n
    else:<\/p>\n
        rAI<\/a>se ValueError("Invalid input type")<\/p>\n
<\/code><\/pre>\n<\/p>\n
2\u3001\u591a\u6001\u548c\u7ee7\u627f<\/strong><\/h3>\n<\/p>\n
\u5728\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u4e2d\uff0c\u4f7f\u7528isinstance<\/code>\u548cissubclass<\/code>\u51fd\u6570\u53ef\u4ee5\u5904\u7406\u591a\u6001\u548c\u7ee7\u627f\u5173\u7cfb\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a\u56fe\u5f62\u5e93\u4e2d\uff0c\u53ef\u4ee5\u6709\u4e0d\u540c\u7684\u5f62\u72b6\u7c7b\uff0c\u4f7f\u7528\u8fd9\u4e9b\u51fd\u6570\u53ef\u4ee5\u5b9e\u73b0\u901a\u7528\u7684\u7ed8\u5236\u65b9\u6cd5\uff1a<\/p>\n<\/p>\n
class Shape:<\/p>\n
    def draw(self):<\/p>\n
        pass<\/p>\n
class Circle(Shape):<\/p>\n
    def draw(self):<\/p>\n
        print("Drawing a circle")<\/p>\n
class Square(Shape):<\/p>\n
    def draw(self):<\/p>\n
        print("Drawing a square")<\/p>\n
def draw_shape(shape):<\/p>\n
    if isinstance(shape, Shape):<\/p>\n
        shape.draw()<\/p>\n
    else:<\/p>\n
        raise TypeError("Expected a Shape instance")<\/p>\n
draw_shape(Circle())  # \u8f93\u51fa\uff1aDrawing a circle<\/p>\n
draw_shape(Square())  # \u8f93\u51fa\uff1aDrawing a square<\/p>\n
<\/code><\/pre>\n<\/p>\n
3\u3001\u6cdb\u578b\u7f16\u7a0b<\/strong><\/h3>\n<\/p>\n
\u5728\u4e00\u4e9b\u9ad8\u7ea7\u7f16\u7a0b\u6a21\u5f0f\u4e2d\uff0c\u5982\u6cdb\u578b\u7f16\u7a0b\uff0c\u7c7b\u578b\u68c0\u67e5\u4e5f\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u4f8b\u5982\uff0c\u5728\u5b9e\u73b0\u4e00\u4e2a\u901a\u7528\u7684\u5bb9\u5668\u7c7b\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528isinstance<\/code>\u68c0\u67e5\u5143\u7d20\u7c7b\u578b\uff1a<\/p>\n<\/p>\n
class Container:<\/p>\n
    def __init__(self):<\/p>\n
        self.items = []<\/p>\n
    def add_item(self, item):<\/p>\n
        if isinstance(item, (int, str)):<\/p>\n
            self.items.append(item)<\/p>\n
        else:<\/p>\n
            raise TypeError("Unsupported item type")<\/p>\n
container = Container()<\/p>\n
container.add_item(10)<\/p>\n
container.add_item("Hello")<\/p>\n
print(container.items)  # \u8f93\u51fa\uff1a[10, 'Hello']<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u516d\u3001\u603b\u7ed3<\/h2>\n<\/p>\n
\u5728Python\u4e2d\uff0c\u4f7f\u7528type<\/code>\u51fd\u6570\u3001isinstance<\/code>\u51fd\u6570\u3001\u7ed3\u5408\u6761\u4ef6\u5224\u65ad\u3001\u4e0e\u5176\u4ed6\u5185\u7f6e\u51fd\u6570\u7ed3\u5408\u4f7f\u7528\u7b49\u65b9\u6cd5\u6765\u6d4b\u8bd5\u548c\u5904\u7406\u6570\u636e\u7c7b\u578b\uff0c\u5177\u6709\u4e0d\u540c\u7684\u5e94\u7528\u573a\u666f\u548c\u4f18\u52bf<\/strong>\u3002\u5408\u7406\u4f7f\u7528\u8fd9\u4e9b\u65b9\u6cd5\uff0c\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u7801\u7684\u5065\u58ee\u6027\u548c\u53ef\u7ef4\u62a4\u6027\uff0c\u4ece\u800c\u4f7f\u5f97\u4ee3\u7801\u5728\u5904\u7406\u591a\u6837\u5316\u548c\u590d\u6742\u7684\u7c7b\u578b\u65f6\u66f4\u52a0\u7075\u6d3b\u548c\u9ad8\u6548\u3002<\/p>\n<\/p>\n
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