Call a function in python, getting '(function) is not defined'? [duplicate]

Question

I recently started learning Python and have some code here.

...
workout = input("Work out if you won?")

if workout == "y":
    ballone()
elif workout == "n":
    print("Okay.")
    sys.exit("Not working out if you won")
else:
    sys.exit("Could not understand")

##Ball one
def ballone():
...

The issue is calling 'ballone'. You can see that it is defined and works perfectly when called from the command line (ballone())

Any ideas? I have scoured the net but cannot seem to find anything to help me. If any more code needs posting then please let me know :)

Answer 1

Move the function definition to before the lines that use it.

def ballone():
    # ...

if workout == "y":
    ballone()
elif workout == "n":
    print("Okay.")
    sys.exit("Not working out if you won")
else:
    sys.exit("Could not understand")

Functions are stored in identifiers (variables), just like your workout value. If you don't define it first, how is Python to know it'll be defined later?