Build an Apply Discount Function

Python
1

I have written the steps for this lab, but the result is still blank. It shows the error referring to step 7 ([apply_discount (100, 20)] should return [80]).

def apply_discount (price, discount):
    if not isinstance (price, (int or float)):
         return ("The price should be a number")
    elif not isinstance (discount, (int or float)):
         return ("The discount should be a number")
    elif price <= 0:
          return ("The price should be greater than 0")
    elif discount < 0 or discount > 100:
         return ("The discount should be between 0 and 100")

else:
    apply_discount (100, 20)
    sale_price = (price * (1-discount / 100))
          return (sale_price)

    apply_discount (200, 50)
    sale_price = (price * (1-discount / 100))
         return (sale_price)

    apply_discount (50, 0)
    sale_price = (price * (1-discount / 100))
        return (sale_price)

    apply_discount (0, 100)
    sale_price = (price * (1-discount / 100))
        return (sale_price)

    apply_discount (74.5, 20)
    sale_price = (price * (1-discount / 100))
        return (sale_price)
2

Welcome to the forum @grayfr5 ,

This is not the correct syntax for isinstance() when checking multiple types.

And your code is showing a syntax error in the console:

Traceback (most recent call last):
  File "main.py", line 11
    else:
    ^^^^
SyntaxError: invalid syntax

Happy coding!

3

I removed the [else:] from the code. The initial error occurs. No returns showing and the error at line 7 of the instructions remain.

def apply_discount(price, discount):

if not isinstance (price, (int or float)):
    return ("The price should be a number")
elif not isinstance (discount, (int or float)):
    return ("The discount should be a number")
elif price <= 0:
    return ("The price should be greater than 0")
elif discount < 0 or discount > 100:
    return ("The discount should be between 0 and 100")

   apply_discount(100, 20)
   sale_price = (price \* (1 - (discount / 100)))
   return (sale_price)

   apply_discount(0, 100)
   sale_price = (price \* (1 - (discount / 100)))
   return (sale_price)

   apply_discount(200, 50)
   sale_price = (price \* (1 - (discount / 100)))
   return (sale_price)

   apply_discount (74.5, 20.0)
   sale_price = (price \* (1 - (discount / 100)))
   return (sale_price)
4

Please post your updated code if you need more help.