TypeError: unsupported operand type(s) for -: 'str' and 'int'


Question

New to python and programing how come I'm getting this error?

def cat_n_times(s, n):
    while s != 0:
        print(n)
        s = s - 1

text = input("What would you like the computer to repeat back to you: ")
num = input("How many times: ")

cat_n_times(num, text)
1
42
3/4/2010 2:38:54 AM

  1. The reason this is failing is because (Python 3) input returns a string. To convert it to an integer, use int(some_string).

  2. You do not typically keep track of indices manually in Python. A better way to implement such a function would be

    def cat_n_times(s, n):
        for i in range(n):
            print(s) 
    
    text = input("What would you like the computer to repeat back to you: ")
    num = int(input("How many times: ")) # Convert to an int immediately.
    
    cat_n_times(text, num)
    
  3. I changed your API above a bit. It seems to me that n should be the number of times and s should be the string.

49
7/24/2018 5:25:01 PM

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