How to Resolve \'TypeError: Unsupported Operand Types for -: \'str\' and \'int\'\' Error in Python?

TypeError: Unsupported Operand Types for Subtraction

When encountering the error "TypeError: unsupported operand type(s) for -: 'str' and 'int'", it signifies that an attempt has been made to subtract two incompatible operands, typically a string and an integer.

In this instance, the provided Python code demonstrates this error:

<code class="python">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)</code>

The error stems from attempting to subtract the variable s (assigned the result of input) by 1. However, input returns a string, and Python cannot perform subtraction on strings and integers.

To resolve this, convert num to an integer using int(num) immediately after receiving the input:

<code class="python">num = int(input("How many times: "))</code>

Additionally, the code could be simplified using a for loop:

<code class="python">def cat_n_times(s, n):
    for _ in range(n):
        print(s)</code>

This revised code will accept a string for text and an integer for num, ensuring that the subtraction operation is performed correctly.

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