Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed3a.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
MIME-Version: 1.0
In-Reply-To: <54b758e1$0$2738$c3e8da3$76491128@news.astraweb.com>
References: <3d8068b3-7b63-43c0-bbf2-6111b2c73aa4@googlegroups.com> <54b758e1$0$2738$c3e8da3$76491128@news.astraweb.com>
From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Wed, 14 Jan 2015 23:39:09 -0700
Subject: Re: lambdak: multi-line lambda implementation in native Python
To: Python <python-list@python.org>
Content-Type: text/plain; charset=UTF-8
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.17741.1421303993.18130.python-list@python.org>
Lines: 33
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: csiph.com comp.lang.python:83796

On Wed, Jan 14, 2015 at 11:06 PM, Steven D'Aprano <steve@pearwood.info> wrote:
> I have a function, which I put into an expression like this:
>
> def func(a, b=None):
>     global spam
>     import math
>     spam = [a, b]*3
>     print spam
>     del spam
>
>
> value = [1, "hello", int, func]
> del func
>
> How would I use lambdak to write that as an expression
>
> value = [1, "hello", int, ??????? ]
>
> without the intermediate def?


# Untested, but seems like this should work.

value = [1, "hello", int, given_(lambda a, b=None:
    import_("math", lambda math:
    import_("operator", lambda operator:
    do_(lambda: operator.setitem(globals(), 'spam', [a, b]*3), lambda:
    print_(globals()['spam'], lambda:
    do_(lambda: operator.delitem(globals(), 'spam')))))))]


To the OP: I note that although import_ is used in the examples, it's
not found in the list of functions in the README.