小编pie*_*uez的帖子

我想对一个对象的所有实例的 costsum 属性求和。

class ActivityCenter:

    def __init__(self, costpool, costsum, costdriver, cdunits):
        self.costpool = costpool
        self.costsum = costsum
        self.costdriver = costdriver
        self.cdunits = cdunits

cp1 = ActivityCenter("Material Handling", 480000, "Pounds", 160000)
cp2 = ActivityCenter("Production orders", 90000, "Num of POs", 200)

# I am looking to add up the costsum values for all instances, similar to:
costsumtotal = (cp1.__dict__.get("costsum")) + (cp2.__dict__.get("costsum"))

到目前为止，我已经尝试使用 sum() 进行如下理解，参考这个解决方案：

B = []
for i in range(10):
    B.append(ActivityCenter())

s = sum(i.costsum for i in B)

但是我无法克服缺少 …