function/method assigment

[7stud]

On Apr 13, 10:14 am, viscr... at gmail.com wrote:
> I have a confusion when I do some practice, the code and output are as
> following,
>
> >>> def fun():
>
>         print 'In fun()....'
>
> >>> testfun = fun()
> In fun()....
> >>> print testfun
> None
> >>> testfun2 = fun
> >>> print testfun2
>
> <function fun at 0x00CC1270>>>> print testfun2()
>
> In fun()....
> None
>
>
>
> what is 'testfun'? Why it is 'None'? And print testfun2(), what is the
> meaning of 'None'?
>
> Thanks!

Start with these rules:

1) all function calls in your code are replaced by the function's
return value.

2) if a function doesn't have a return statement, it automatically
returns None.

3  The '()' symbols make the function execute.  Without those the
function won't execute.