1. hasattr(object, name) 判断object里是否有name属性,有就返回True,没有则返回False。 class MyClass(object): name = jack age = 22 obj = MyClass() print(hasattr(obj, name)) # True print(hasattr(MyClass, age)) ...
...=1,b=3) # 只能通过这两种方式调用 反射-getattr & setattr & hasattr & delattr & import_module 综合例子: from importlib import import_module random = import_module(random) # 动态反射导入模块 # 或 ran...
...time.sleep(1) @classmethod def instance(cls, *args, **kwargs): if not hasattr(Singleton, _instance): with Singleton._instance_lock: if not hasattr(Singleton, _instance): ...
...对象(都可以使用反射)四个可以实现反射的函数: def hasattr(*args, **kwargs): # real signature unknown Return whether the object has an attribute with the given name. This is done by calling getattr(obj,...
... >>> echo(ObjectCreator) # you can pass a class as a parameter >>> print(hasattr(ObjectCreator, new_attribute)) False >>> ObjectCreator.new_attribute = foo # you can add attributes to a class >>>...
...lt方法: @classmethod def configurable_default(cls): if hasattr(select, epoll): from tornado.platform.epoll import EPollIOLoop return EPollIOLoop if has...
...lib.request.urlopen(req) except urllib.error.URLError as e: if hasattr(e, code): print(e.code) if hasattr(e, reason): print(e.reason) except Exceptio...
.... >>> echo(ObjectCreator) # you can pass a class as a parameter >>> print(hasattr(ObjectCreator, new_attribute)) False >>> ObjectCreator.new_attribute = foo # you can add attributes to a class >>>...
...urn 3 a = A() print prop in a.__dict__ =, prop in a.__dict__ print hasattr(a, prop) =, hasattr(a, prop) print a.prop =, a.prop # prop in a.__dict__ = False # hasattr(a, prop) = True # a.prop = 3 ...
... % (key, cls.__name__)) if not hasattr(cls, key): raise TypeError(u%s() received an invalid keyword %r % ( cls.__name...
...k__(cls, instance): print(__instancecheck__ call) return hasattr(instance, __len__) class B(object): pass b = B() print(isinstance(b, Sizeable)) # output:False 只打印了 False,并且 _...
... class Foo(metaclass = upper_attr): # 指定元类 bar = bip print(hasattr(Foo, bar)) # 输出: False print(hasattr(Foo, BAR)) # 输出:True 二、枚举类 在开发中经常设置多组常量,Enum可以把一组相关常量定义在一个class中,且class不可变,而且成员可...
...ssert h in x def test_two(self): x = hello assert hasattr(x, check) 运行下面的-q是 quiet的意思,就是忽略一些很细节的信息 使用测试类时,注意下面几点: 测试类所在的文件以test_开头 测试类以Test开头,并且不能带有__in...
...le()、reduce()和reload ()函数都被去除了 现在可以使用hasattr()来替换 callable(). hasattr()的语法如:hasattr(string, __name__) 4)string.letters和相关的.lowercase和.uppercase被去除,请改用string.ascii_letters 等 5)如果x < y的不能...
...le()、reduce()和reload ()函数都被去除了 现在可以使用hasattr()来替换 callable(). hasattr()的语法如:hasattr(string, __name__) 4)string.letters和相关的.lowercase和.uppercase被去除,请改用string.ascii_letters 等 5)如果x < y的不能...
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