CODEWITHSUNDEEP
python
Din
Din

Reputation: 1

exit error in python

while True:
   get2=input('Enter: ')
   lst2.append(get2)
   if get2=='':
       break

TypeError: unsupported operand type(s) for +: 'int' and 'str' occurs. I think this is because the '' for the exit command is not recognized as a integer. How do I '', the enter key, as the exit code AND make sum(list) function work?

Upvotes: 0

Views: 249

Answers (2)

Pythonista
Pythonista

Reputation: 11645

You're appending a string and then trying to sum a bunch of strings togethers.

You need to convert them to integers / floating point numbers first so you'd have lst2.append(int(get2)) and lst1.append(int(get1))

or you could use float for floating point numbers

Upvotes: 2

Aaron Christiansen
Aaron Christiansen

Reputation: 11837

The result of input in Python 3 is always a string. The sum function is then trying to add each item of the list together, starting with 0, so it attempts to to this:

0 + your_list[0]

But, the first item of your list is a string, and you can't add an integer to a string.

To get around this, convert the input to an integer first by using the int function:

print('Enter a series of integers. Hit enter to quit')
lst1=[]
lst2=[]

while True:
    get1=input('Enter: ')
    if get1=='':
        break
    lst1.append(int(get1))



while True:
   get2=input('Enter: ')
   if get2=='':
       break
   lst2.append(int(get2))


if sum(lst1)==sum(lst2):
   print('The two lists add up the same')
else:
   print('The two lists do not add up')

Note that I've moved the if statements before the integer conversion, because otherwise entering '' will cause an exception to be thrown as an empty string isn't a valid integer.

Upvotes: 2

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