Question

这是我的代码（Python 3.2）

Total = eval(input("How many numbers do you want to enter? "))
#say the user enters 3
for i in range(Total):
    Numbers = input("Please enter a number ")
#User enters in 1
#User enters in 2
#User enters in 3
print ("The sum of the numbers you entered is", Numbers)
#It displays 3 instead of 6

如何正确添加？

Answer 1

快速而又脏的重写你的行：

Total = int(input("How many numbers do you want to enter? "))
#say the user enters 3
Numbers=[]
for i in range(Total):
    Numbers.append(int(input("Please enter a number "))
#User enters in 1
#User enters in 2
#User enters in 3
print ("The sum of the numbers you entered is", sum(Numbers))
#It displays 3 instead of 6

我假设您使用Python 3是因为print的方式，但如果您使用Python 2，请使用raw_input而不是input。

Answer 2

此代码将解决您的问题：

total = int(input("How many numbers do you want to enter? "))
#say the user enters 3
sum_input = 0
for i in range(total):
    sum_input += int(input("Please enter a number "))
#User enters in 1
#User enters in 2
#User enters in 3
print ("The sum of the numbers you entered are", sum_input)

一些评论：

您应该坚持使用pep8来设置样式和变量名称。具体来说，对变量名和函数名使用under_store，对类名使用CapWords。
eval的使用在这里值得怀疑。 This article非常清楚地解释了为什么不应在most cases中使用eval。

Answer 3

你需要在for循环之外声明你的变量，并继续在循环中为它添加输入数字。

numbers = 0
for i in range(Total):
    numbers += int(input("Please enter a number "))

print ("The sum of the numbers you entered are", numbers)

如何在python中多次添加相同的变量？

3 个答案: