实例运行结果为什么多一个None
class Person(object):
def __init__(self,name,gender):
self.name = name
self.gender = gender
def __call__(self,friend):
print('My name is {}...'.format(self.name))
print('My friend is {}...'.format(friend))
p = Person('Bob', 'Male')
print(p('Alice'))运行结果：
My name is Bob... My friend is Alice... None
为什么最后一行还有一个None？
