类与实例
一、类定义
# class A(object): # object 是所有类的基类
# class A():
class A:
print('This is a class')
>>> This is a class
print(A,id(A),type(A),'\n',dir(A))
>>> <class '__main__.A'> 35956368 <class 'type'>
>>> ['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__']
1、类对象
一切即为对象,A定义后是一个类对象ÿ