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

This error occurs when you try to subtract a string from an integer.

For example:

a = 10
b = "5"
c = a - b

In this example, the variable "a" is an integer with a value of 10, while the variable "b" is a string with a value of "5". When we try to subtract "b" from "a", we get the error message "unsupported operand type(s) for -: 'str' and 'int'".

To fix this error, we need to ensure that both variables are of the same data type. In this case, we could convert "b" from a string to an integer using the int() function:

a = 10
b = "5"
c = a - int(b)

Now, the variable "b" has been converted to an integer using the int() function, and we can subtract it from "a" without any errors.