what does 'for _ in range()' mean?

[Peter Otten]

Michael Charlton wrote:

> I've just tried it on some toy code and as always I run pychecker on it.
> So with
> 
>             def spam():
>                    for i in range(10):
>                         print 'a'
> 
> I get "Local variable (i) not used". But with the following:
> 
>             def spam():
>                    for _ in range(10):
>                         print 'a'
> 
> I get no such warning. Is pychecker aware of this convention or is it
> coincidental? I don't

Found in Config.py:

_DEFAULT_UNUSED_LIST = [ '_', 'empty', 'unused', 'dummy', ]

Peter