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Re: Calling Values

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On Fri, 3 Aug 2012 04:49:46 -0700 (PDT), Subhabrata
<subhabangalore@gmail.com> declaimed the following in
gmane.comp.python.general:

> Dear Group,
> 
> I am trying to call the values of one function in the another function in the following way:

	Technically, "the values of one function" are whatever it RETURNS;

> def func1():
> 	num1=10
> 	num2=20
> 	print "The Second Number is:",num2
> 	return
>
	This function returns None.

	Recommended software design practices are that any thing inside the
function should be local to just that function -- a function should be a
black box -- you call it with some data, and you obtain some results
when it returns; what it does internally should be "invisible" and have
no effect on any other code.

	Read:
http://en.wikipedia.org/wiki/Coupling_%28computer_programming%29
(what you are attempting falls into "content coupling" if you change the
use of "module" to "function")

	However, Python lets you declare names to be global (to the
module/file). This is primarily meant to be used when a function must
rebind a module level entity. (This would be "common coupling")

def func1():
	global num1, num2
	...

But, as mentioned, that now makes num1 and num2 names that are known
outside the functions.
 
> def func2():
> 	num3=num1+num2
> 	num4=num3+num1
> 	print "New Number One is:",num3
> 	print "New Number Two is:",num4
> 	return
> 
	Misleading print statements, as you are NOT changing "number one" or
"number two"; you've just created two NEW names (num3, num4).

> I am preferring not to use argument passing or using class? Is there any alternate way?
>

	Well, if you end func1 with

	return num1, num2

you can change func2 into:

def func2():
	n1, n2 = func1()
	num3 = n1 + n2
	num4 = num3 + n1
...
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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Calling Values Subhabrata <subhabangalore@gmail.com> - 2012-08-03 04:49 -0700
  Re: Calling Values Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-08-03 13:07 +0100
  Re: Calling Values Nobody <nobody@nowhere.com> - 2012-08-03 13:44 +0100
  Re: Calling Values Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-08-03 14:32 +0200
  Re: Calling Values subhabangalore@gmail.com - 2012-08-03 07:38 -0700
    RE: Calling Values "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-08-03 15:30 +0000
    Re: Calling Values Ethan Furman <ethan@stoneleaf.us> - 2012-08-03 08:37 -0700
  Re: Calling Values Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-08-03 16:24 +0000
  Re: Calling Values Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-08-03 13:20 -0400
    Re: Calling Values subhabangalore@gmail.com - 2012-08-03 11:23 -0700
    Re: Calling Values subhabangalore@gmail.com - 2012-08-03 11:23 -0700
  Re: Calling Values alex23 <wuwei23@gmail.com> - 2012-08-05 19:56 -0700

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