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英文文档：
class type(object)
class type(name, bases, dict)
With one argument, return the type of an object. The return value is a type object and generally the same object as returned by object.__class__.
The isinstance() built-in function is recommended for testing the type of an object, because it takes subclasses into account.
With three arguments, return a new type object. This is essentially a dynamic form of the class statement. The namestring is the class name and becomes the __name__ attribute; the bases tuple itemizes the base classes and becomes the __bases__ attribute; and the dict dictionary is the namespace containing definitions for class body and is copied to a standard dictionary to become the __dict__ attribute.
返回对象的类型，或者根据传入的参数创建一个新的类型
说明：
1. 函数只传入一个参数时，返回参数对象的类型。 返回值是一个类型对象，通常与对象.__ class__返回的对象相同。
#定义类型A >>> class A: name = 'defined in A' #创建类型A实例a >>> a = A() #a.__class__属性 >>> a.__class__#type(a)返回a的类型 >>> type(a) #测试类型 >>> type(a) == A True
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