Question

我正在尝试让用户输入一系列数字（用逗号分隔）以接收总数。

我已经尝试过（没有运气）：

values = input("Input some comma seprated numbers: ")
numbersSum = sum(values)
print ("sum of list element is : ", numbersSum)

values = input("Input some comma seprated numbers: ")
list = values.split(",")
sum(list)
print ("The total sum is: ", sum)

如果用户输入5.5、6、5.5，则预期输出为17。

Answer 1

你快到了。

分割后，值仍然是字符串，因此必须将它们映射为浮点数。

values = "5.5,6,5.5" # input("Input some comma seprated numbers: ")
L = list(map(float, values.split(",")))
print ("The total sum is: ", sum(L))

输出：

The total sum is:  17.0

旁注：请不要命名变量list或sum，否则将隐藏python内置函数！

Answer 2

用逗号将值split values = input("Input some comma seprated numbers: ") lst = values.split(",") lst = [float(x) for x in lst] total = sum(lst) print("The total sum is: ", total)制成列表后，需要将它们从字符串转换为数字。您可以使用

list

有关参考，请参见List Comprehensions in Python。

（此外，您不应该使用KFunction作为变量名，因为这是Python中的函数。）

Answer 3

您必须将输入转换为float：

numbers = input("Input some comma seprated numbers: ")

result = sum([float(n) for n in numbers.split(',')])

print(result)

Answer 4

您必须先转换为数字，然后再将其加在一起。

例如，您可以将它们全部转换为float：

input_str = input("Input some comma seprated numbers: ")

# Option1: without error checking
number_list = [float(s) for s in input_str.split(',')]

# Option2: with error checking, if you are not sure if the user will input only valid numbers
number_list = []
for s in input_str.split(','):
    try:
        n = float(s)
        number_list.append(n)
    except ValueError:
        pass

print("The list of valid numbers is:", number_list)
print("The sum of the list is:", sum(number_list))

Answer 5

很难知道出了什么问题而没有错误\输出代码的样本。

我认为问题在于当它是一个字符串列表时，要获取列表的总和（非常糟糕的名字）。

请尝试以下

values = input("Input some comma seprated numbers: ")
lst = values.split(",")
lst = [int(curr) for curr in lst]
sum(lst)
print ("The total sum is: ", sum)

该代码在期望整数时将起作用，如果您要使用浮点数，请更改列表理解。

尽量不要用标准对象的名称来命名对象，例如list，int，str，float等...

Answer 6

# empty list to store the user inputs
lst = []      

# a loop that will keep taking input until the user wants
while True:
    # ask for the input
    value = input("Input a number: ")
    # append the value to the list
    lst.append(value)
    # if the user wants to exit
    IsExit = input("enter exit to exit")
    if 'exit' in IsExit:
        break

# take the sum of each element (casted to float) in the lst 
print("The sum of the list: {} ".format(sum([float(x) for x in lst])))

输出：

Input a number: 5.5
enter exit to exitno
Input a number: 6
enter exit to exitno
Input a number: 5.5
enter exit to exitexit
The sum of the list: 17.0

Answer 7

在下面使用

print('sum of input is :',sum(list(map(float,input('Input some comma separated numbers: ').split(',')))))

如何将数字与输入分开以添加数字？

7 个答案: