11 是否可调用¶
判断对象是否可被调用,能被调用的对象就是一个callable
对象,比如函数 str
, int
等都是可被调用的,但是例子4
中xiaoming
实例是不可被调用的:
In [1]: callable(str)
Out[1]: True
In [2]: callable(int)
Out[2]: True
In [3]: xiaoming
Out[3]: id = 001, name = xiaoming
In [4]: callable(xiaoming)
Out[4]: False
如果想让xiaoming
能被调用 xiaoming(),
需要重写Student
类的__call__
方法:
In [1]: class Student():
...: def __init__(self,id,name):
...: self.id = id
...: self.name = name
...: def __repr__(self):
...: return 'id = '+self.id +', name = '+self.name
...: def __call__(self):
...: print('I can be called')
...: print(f'my name is {self.name}')
...:
...:
In [2]: t = Student('001','xiaoming')
In [3]: t()
I can be called
my name is xiaoming