[Baypiggies] lambda for newbies

[David Berthelot]

Ok thanks for the links (I bookmarked your functional package, because I'm also a heavy user of partial function application, why right now I do by doing something along the line of fz5 = lambda x,y:f(x,y,z=5))

So basically Guido really wants to bin lambda,map,reduce,filter which are constructs I use a lot.

I can understand for map,filter given the redundant semantic. I can accept that reduce is easier to read written as a loop, although I find it useful for combining one-to-one elements in lists (and lists of lists, etc...).

Now for lambda, basically it's still very useful even without filter,reduce or map. That's probably the most controversial one to me.

I often use it to pass basic functions (that are so basic that keeping them unnamed is perfect) to other functions. If I have to name all those unnamed lambda functions to use them, that's going to be quite verbose, probably a bit too much.

----- Original Message ----
From: Collin Winter <collinw at gmail.com>
To: David Berthelot <d_berthelot at yahoo.com>
Cc: Dan Weeks <dan+baypiggies at danimal.org>; Python <baypiggies at python.org>
Sent: Friday, May 11, 2007 11:18:16 AM
Subject: Re: [Baypiggies] lambda for newbies

On 5/11/07, David Berthelot <d_berthelot at yahoo.com> wrote:
> Ok, it's my first post on the list, hi everyone.
>
> That being said, what is the reason for removal of reduce() ?
> I love this function, how is its functionality going to be done next ?

Guido's position: http://www.artima.com/weblogs/viewpost.jsp?thread=98196

My own functional package
(http://cheeseshop.python.org/pypi/functional/) provides reduce() and
other functional programming constructs; it will continue to be
available for Python 3.

Collin Winter


> ----- Original Message ----
> From: Collin Winter <collinw at gmail.com>
> To: Dan Weeks <dan+baypiggies at danimal.org>
> Cc: Python <baypiggies at python.org>
> Sent: Friday, May 11, 2007 8:06:49 AM
> Subject: Re: [Baypiggies] lambda for newbies
>
> On 5/11/07, Dan Weeks <dan+baypiggies at danimal.org> wrote:
> > On 2007-05-11 01:03, Shannon -jj Behrens threw down some bits like this:
> > > Hey guys,
> > >
> > > I often hear Python newbies who are confused about lambda.  Let's
> > > start with some code:
> >
> > > These days, with list comprehensions, you can just write:
> >
> > While it's great that to teach about lambda and lisp-like programming
> > I think focusing on list comprehensions is well more worth while,
> > especially since they're more pythonic and the lisp-like lambda,
> > filter(), map(), and reduce() are slated for removal in Python 3000.
> > Of course there is code that exists that needs to be maintained now and
> > you've done a good job of explaining lambda for newbies so they can do
> > that.
>
> map() and filter() will stay; only reduce() is being removed.
>
> Collin Winter
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