python - 使用 python 添加两个自定义数据类型？

Question

class MyInt(object) :

     #  I'm trying to add two custom types (MyInt) together
     #  and have the sum be the same type. (MyInt) 
     #  What am I doing wrong? 

     def __init__(self, x):
       self.x = x

     def __add__(self,other):
       return self.x + other    

a = MyInt(1)

b = MyInt(1)

print a + 1    # ---->  2

print type(a)  # ---->  "class '__main__.MyInt' 

 #c = a + b     #  this won't work 

 #print a + b    #  this won't work

Answer 1

__add__有错误，应该是:

def __add__(self,other):
   return MyInt(self.x + other.x)   

然后，您可以添加 MyInt 实例:

a = MyInt(1)
b = MyInt(1)

c = a + b
print type(c)  # prints <class '__main__.MyInt'>
print c.x  # prints 2

请注意，a + 1 将不起作用，因为 1 不是 MyInt 的类型。如果你想支持它，你需要改进你的 __add__ 方法并定义在不同类型的 other 参数的情况下如何表现。