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Python Python Basics (2015) Logic in Python Try and Except

Jt Miller
Jt Miller
1,242 Points

Functions,Float

This is what it's asking.

You're doing great! Just one more task but it's a bigger one. Right now, we turn everything into a float. That's great so long as we're getting numbers or numbers as a string. We should handle cases where we get a non-number, though. Add a try block before where you turn your arguments into floats. Then add an except to catch the possible ValueError. Inside the except block, return None. If you're following the structure from the videos, add an else: for your final return of the added floats.

trial.py
try:
def add(num1,num2):
    num1 = float(num1)
    num2 = float(num2)
    return(num1 + num2)
except ValueError:
    return(none)
else:
    print(num1)
    print(num2)

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points

You are headed in the right direction.

  • The try statement should be inside the function definition and all the subsequent statements properly indented.
  • The return value in the except block should be None not "none".
  • The else and the print statements will never execute because either the try or the except will result in a return.
  • The return statement isn't a function, so parentheses should not be used.

Post back if you need more help. Good luck!!