python之如何通过一次循环对多个对象属性求和(求和)

我想在一个循环中一次对多个属性求和:

class Some(object): 
    def __init__(self, acounter, bcounter): 
        self.acounter = acounter 
        self.bcounter = bcounter 
 
someList = [Some(x, x) for x in range(10)] 

我可以做一些比它更简单、更快的事情吗？

atotal = sum([x.acounter for x in someList]) 
btotal = sum([x.bcounter for x in someList]) 

请您参考如下方法:

首先 - sum 不需要列表 - 你可以使用生成器表达式来代替:

atotal = sum(x.acounter for x in someList) 

您可以编写一个辅助函数来搜索列表一次，然后按项目依次查找每个属性，例如:

def multisum(iterable, *attributes, **kwargs): 
    sums = dict.fromkeys(attributes, kwargs.get('start', 0)) 
    for it in iterable: 
        for attr in attributes: 
            sums[attr] += getattr(it, attr) 
    return sums 
 
counts = multisum(someList, 'acounter', 'bcounter') 
# {'bcounter': 45, 'acounter': 45}