learning-python question

[Trent Mick]

On Mon, Jun 26, 2000 at 08:34:43PM +0000, JeremyLynch at fsmail.net wrote:
> hi,
> I have just started learning python, although I am already confident in
> c/c++, and I finding some of python's features confusing. This may seem
> like a *very* stupid question so ignore it if you want to :)
> My problem simplifies to:
> 
> count = 5
> 
> def count_func()
>      print count
             ^^^^^
This reference to count is raising a NameError. This is because the global
namespace is not searched when in a Python function. You have to explicitly
declare any global variables used in a function with the 'global' keyword,

>      count = count + 1


so.... this is what you want:

c:\temp> python
>>> count = 5
>>>
>>> def count_func():
...     global count
...     print count
...     count = count + 1
...
>>>
>>> count_func()
5
>>> count_func()
6
>>>



As well, you have to have a colon after the 'def count_func()'.


Trent


-- 
Trent Mick
trentm at activestate.com