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

This error occurs when trying to perform a subtraction operation on two strings in Python. Strings do not support subtraction operations, so you cannot directly subtract one string from another.

To resolve this issue, you can convert the strings to numerical values before performing the subtraction operation. For example:

str1 = "10"
str2 = "5"

num1 = int(str1)
num2 = int(str2)

result = num1 - num2

print(result)

This code will convert the strings "10" and "5" to integers before subtracting them, resulting in the output of 5.