[Python-Dev] [rfc] map enhancement

[Ludovic Aubry]

This is nice,

The strongest objection regarding using
map(f,L,x=K) is that there is no clear way of telling
the reader that the keyword argument will be passed as a constant

Your solution for itertools can work with map too:

def repeat(v,n):
    while n:
       yield v
       n-=1

map(f,L,repeat(K,len(L)))

would do the trick
As a nice addition it also allows one to put constants anywhere
in the argument list for f

Thanks for the idea

On Tue, Feb 18, 2003 at 10:13:44PM -0500, Raymond Hettinger wrote:
> > It appears as though you ought to be able to write this as:
> > 
> >    return map(operator.getitem, data, b=1)
> > 
> > except that operator.getitem, in common with many builtin functions doesn't 
> > accept any keyword arguments.
> > 
> > This is a pity as it cripples most of the situations where you might 
> > otherwise want to use this. e.g. add a constant to elements of a list, or 
> > multiply by a constant.
> 
> For Py2.3, the itertools module can help:
> 
> itertools.imap(operator.__getitem__, data, itertools.repeat(1))
> 
> 
> Raymond Hettinger
> 
> _______________________________________________
> Python-Dev mailing list
> Python-Dev@python.org
> http://mail.python.org/mailman/listinfo/python-dev

-- 
Ludovic Aubry                                 LOGILAB, Paris (France).
http://www.logilab.com   http://www.logilab.fr  http://www.logilab.org