python的sum()和非整数值 [英] python's sum() and non-integer values
本文介绍了python的sum()和非整数值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
是否有一种简单快捷的方法可以将sum()与非整数值一起使用?
Is there a simple and quick way to use sum() with non-integer values?
所以我可以这样使用它:
So I can use it like this:
class Foo(object):
def __init__(self,bar)
self.bar=bar
mylist=[Foo(3),Foo(34),Foo(63),200]
result=sum(mylist) # result should be 300
我尝试覆盖__add__
和__int__
等,但是我还没有找到解决方案
I tried overriding __add__
and __int__
etc, but I don't have found a solution yet
解决方案是实施:
def __radd__(self, other):
return other + self.bar
如威尔在他的帖子中所建议的.但是像往常一样,所有道路都通向罗马,但是我认为这是最好的解决方案,因为我不需要在课堂上使用__add__
as Will suggested in his post. But as always, all roads lead to Rome, but I think this is the best solution since I don't need __add__
in my class
推荐答案
有点棘手-sum()函数将开始并将其添加到下一个,依此类推
Its a bit tricky - the sum() function takes the start and adds it to the next and so on
您需要实现__radd__
方法:
class T:
def __init__(self,x):
self.x = x
def __radd__(self, other):
return other + self.x
test = (T(1),T(2),T(3),200)
print sum(test)
这篇关于python的sum()和非整数值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文