How do I add inputs together from more than 1 input in Python

Question

I want to input something like "g 1 2 3" repeatedly and have the numbers add to a variable each time I enter them. I made a test program however the output is wrong e.g. if I enter "g 1 2 3" 3 times I would expect my variable to print "3" but it prints "0". What is wrong with my code?

AddTot = int(0)
NameMarks = input("Please input your name followed by your marks seperated by spaces ")
NameMSplit = NameMarks.split()
while NameMarks != 'Q':
    Name1 = int(NameMSplit[1])
    Name2 = int(NameMSplit[2])
    Name3 = int(NameMSplit[3])
    AddTot + Name1
    NameMarks = input("Please input your name followed by your marks seperated by spaces ")
print(AddTot)

vaultah · Accepted Answer · 2016-07-03 11:23:06Z

1

AddTot + Name1 does not modify AddTot, as in the result won't be stored anywhere. Replace it with

AddTot += Name1 # same as `AddTot = AddTot + Name1`

That said, your program only uses the first input. To fix that, move NameMSplit = NameMarks.split() within the loop body:

AddTot = int(0)
NameMarks = input("Please input your name followed by your marks seperated by spaces ")
while NameMarks != 'Q':
    NameMSplit = NameMarks.split() # here
    Name1 = int(NameMSplit[1])
    Name2 = int(NameMSplit[2])
    Name3 = int(NameMSplit[3])
    AddTot += Name1
    NameMarks = input("Please input your name followed by your marks seperated by spaces ")
print(AddTot)

As for further improvements, you can shorten your code a little:

AddTot = 0 # or int() without argument
say = "Please input your name followed by your marks seperated by spaces "
NameMarks = input(say)
while NameMarks != 'Q':
    marks = [int(x) for x in NameMarks.split()[1:]]
    AddTot += marks[0]
    NameMarks = input(say)

print(AddTot)

edited Jul 3, 2016 at 11:23

answered Jul 8, 2014 at 4:05

vaultah

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1 Comment

user3459426 Over a year ago

Thanks alot for the help, for some reason if i do something like "g 100 2 3" "g 1 2 3" "g 1 2 3" the output is 300

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