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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: lambda in list comprehension acting funny
Date: Fri, 13 Jul 2012 13:47:02 -0400
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Xref: csiph.com comp.lang.python:25277

On Fri, 13 Jul 2012 06:44:59 -0700 (PDT), rusi <rustompmody@gmail.com>
declaimed the following in gmane.comp.python.general:


> Heres a more appropriate analog
> 
> ------------------------------------------
> VERBOSE = True
> 
> def function(arg):
>     if VERBOSE:
>        print("calling function with arg %r" % arg)
>     process(arg)
> 
> def caller():
>     VERBOSE = False
>     function(1)
> 
> ---------------------------------------------
> Python semantics: function sees VERBOSE False

	Wrong... "function" still sees the module level VERBOSE with a value
of True, whereas "caller" created a local VERBOSE set to False. To get
your behavior needs:

	def caller():
		global VERBOSE
		VERBOSE = False
		function(1)


> Haskell semantics: function sees VERBOSE True
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/