Python-遍历许多对象，从它们中提取数据以累加总数

如何解决Python-遍历许多对象，从它们中提取数据以累加总数

我想迭代一些对象，取出数字，并进行累加。这就是我所拥有的：

print ('Calculating Commmissions with objects')
class SalesReps:
    count = 0
    def __init__( self,name,sales,commission) :
        self.name = name
        self.sales = sales
        self.commission = commission
        SalesReps.count += 1
    def name_performance_pay( self ) :
        return self.name
        return self.sales
        return self.commission
    
s1=SalesReps ('BAnderson',15685.75,1568.68)
s2=SalesReps ('GBates',13856.80,1385.68)
s3=SalesReps ('MBerger',18560.44,1437.04)
s4=SalesReps ('JCarter',14375.86,1437.59)
s5=SalesReps ('VChambers',15963.45,1596.35)
print('We have ',SalesReps.count,'sales reps.\n')

for rep in range(1,5):
    print(s[rep].name,s[rep].sales,s[rep].comission,'\n')
    totalSales = totalSales + s[rep].sales
    totalCommissions = totalCommissions + s[rep].commision

print ('Our total sales were ',totalSales,'and our total commissions paid was ',totalCommissions,'.\n)

这就是我得到的：

Traceback (most recent call last):
  File "/home/jrw/Documents/bp.py",line 23,in <module>
    print(s[rep].name,'\n')
NameError: name 's' is not

Python是否有不同的下标约定？我没有找到。

解决方法

您命名了五个不相关的变量（s1，s2，s3，...），但您并没有创建名为list的单个s ，因此不能下标s（没有s）。更改用于初始化s1和公司的代码，以创建名为list的单个s，这将更接近于工作：

s = [SalesReps ('BAnderson',15685.75,1568.68),SalesReps ('GBates',13856.80,1385.68),SalesReps ('MBerger',18560.44,1437.04),SalesReps ('JCarter',14375.86,1437.59),SalesReps ('VChambers',15963.45,1596.35)]

for rep in range(len(s)):

将这样做，尽管它不是Python语言的（for i in range(len(someseq)):基本上总是错误的方式）。更加Pythonic的方法会导致循环：

for rep in s:
    print(rep.name,rep.sales,rep.commission,'\n')
    totalSales += rep.sales
    totalCommissions += rep.commission

直接迭代列表的内容，而不是重复索引的有效索引。

,

这是用pythonic方式进行的修改。

• 使用len(s)代替SalesReps.count。
• 使用sum代替for语句。

print ('Calculating Commmissions with objects')
class SalesReps:
    def __init__( self,name,sales,commission) :
        self.name = name
        self.sales = sales
        self.commission = commission
    def name_performance_pay( self ) :
        return self.name
        return self.sales
        return self.commission
    
s=[SalesReps ('BAnderson',1596.35)]
print('We have ',len(s),'sales reps.\n')

totalSales = sum(r.sales for r in s)
totalCommissions = sum(r.commission for r in s)
print ('Our total sales were ',totalSales,'and our total commissions paid was ',totalCommissions,'.\n')