os.path.join

[Gabriel Genellina]

En Wed, 02 May 2007 04:03:56 -0300, <half.italian at gmail.com> escribió:

> On May 1, 11:10 pm, "Gabriel Genellina" <gagsl-... at yahoo.com.ar>
> wrote:

>> The right usage is os.path.join(*pathparts)
>
> Wow.  What exactly is that * operator doing?  Is it only used in
> passing args to functions?  Does it just expand the list into
> individual string arguments for exactly this situation?  Or does it
> have other uses?

When calling a function, it is used to pass a sequence as positional  
arguments. Similarly, **values is used to pass a dictionary as keyword  
arguments.
When defining a function, *args receives the remaining positional  
arguments not already bound to another parameter; and **kwargs receives  
the remaining keyword arguments not already bound to another parameter.  
[There is nothing special on the *args and **kwargs names, only the * and  
** are important]
See section 4.7 on the Python Tutorial  
http://docs.python.org/tut/node6.html#SECTION006700000000000000000 and  
specially section 4.7.4 Unpacking Argument Lists.
For a more technical description (but sometimes necesary) read the Python  
Reference Manual http://docs.python.org/ref/calls.html

-- 
Gabriel Genellina