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

Posted by Sabaa Talal
Sabaa Talal
Courses Plus Student 733 Points

how to use try: after def functions

i did this code but it gives me an error I need to know what is wrong and how to fix it to go to next lesson

def add(num1, num2): try: add(num1, num2) except ValueError: return None else: return float(num1)+float(num2)

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

1 Answer

Tobias Edwards
Tobias Edwards
14,458 Points
Tobias Edwards
Tobias Edwards
14,458 Points

If you called your add() function , the first thing it would do is within the try block - and it would call the add() function again (so the program would be stuck in an infinite loop if two numbers were passed into the function).

To fix this, I would try converting num1 and num2 into floats within the try block. Then simply return num1 + num2 in the else block.

def add(num1, num2):
    try:
        num1 = float(num1)
        num2 = float(num2)
    except ValueError:
        return None
    else:
        return num1 + num2
Sabaa Talal
Sabaa Talal
Courses Plus Student 733 Points

can you show me how to do that since this was the task(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.)

Tobias Edwards
Tobias Edwards
14,458 Points
Tobias Edwards
Tobias Edwards
14,458 Points

I've updated my answer for you

Sabaa Talal
Sabaa Talal
Courses Plus Student 733 Points

Thank you so much for the answer.. Best regard