Re: Newbie Nested Function Problem
From: Brian Samek (zensunni_at_rochester.rr.com)
Date: 01/25/04
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Date: Sun, 25 Jan 2004 03:47:17 GMT
> Okay, ask_number doesn't do what you're saying. It's asking for a number,
> placed into variable number, and if it gets something out of range, prints
> an error message.
>
> And then ends. It doesn't either a) repeat until it gets a valid number
> or b) do anything with the number it gets, like pass it back to the caller
> in a return statement, i.e.:
>
It does repeat if it doesn't get a valid number. The function calls itself
after printing an error mesage. For some reason the original message
formatted itself differently when I pasted it into my mail program. The
line just before the first else statement should be indented to the same
level as the line before it so it reads:
def ask_number():
number = input("Please enter a number.\n")
if number > 500 or number - int(number) != 0 or number < 1:
print "Input positive integers less then 501 only, please."
ask_number()
else:
> return number
>
> > ask_number()
>
> Okay, you invoked ask_number, but didn't even try to get anything from it.
> Normally, this would read something like:
>
> number_in = asknumber()
>
What do you mean by I "didn't even try to get anything from it." I get a
variable called "number" from it from which the countdown(number) function
counts down.
> > else:
>
> Um.. it looks like you're inadvertably making this a deeply recursive
> call, probably something you want to stay away from until you have regular
> stuff down pat.
I don't understand what you're saying. I designed the program as three
functions nested within each other. Are you saying I should be designing it
differently? I made it a series of nested functions because, for example, I
needed to use the "number" variable from ask_number before it was destroyed.
When a function ends, any variables it has created are destroyed.
Thanks,
Brian
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