# 无论输入任意key,都不会出错,并且value的值不会发生改变
# 数学对象两个必须一样
class TestMagic(object):
def __init__(self,num):
self.a = num
def __setitem__(self, key, value):
self.a = value
def __getitem__(self, item):
return self.a
def __add__(self, other):
return self.a + other.a
def __sub__(self, other):
return self.a - other.a
def __mul__(self, other):
return self.a * other.a
t = TestMagic(10)
t['123as6d'] = 5 # t.__setitem__('123as6d', 10)
print(t['dasdqwd']) # t.__getitem__('dasdqwd')
a = TestMagic(20)
b = TestMagic(30)
print(TestMagic(20) * TestMagic(30))
print(a+b) # a.__add__(b)
Python Magic_Methods 魔法方法
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转载自blog.csdn.net/weixin_42785547/article/details/85089147
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