Message from discussion
Newbie: Struggling again 'map'
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From: Dan Bishop <danb...@yahoo.com>
Newsgroups: comp.lang.python
Subject: Re: Newbie: Struggling again 'map'
Date: 26 May 2007 03:21:16 -0700
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On May 26, 4:54 am, mosscliffe <mcl.off...@googlemail.com> wrote:
> I thought I had the difference between 'zip' and 'map' sorted but when
> I try to fill missing entries with something other than 'None'. I do
> not seem to be able to get it to work - any pointers appreciated.
>
> Richard
>
> lista = ['a1', 'a2']
> listb = ['b10', 'b11','b12' ,'b13']
>
> for x,y in zip(lista, listb): # Fine Truncates as expected
> print "ZIP:", x, "<<x y>>", y
>
> for x,y in map(None, lista, listb): # Also fine - extends as
> expected
> print "MAP:", x, "<<x y>>", y
>
> for x,y in map("N/A", lista, listb): ########## Fails - Can not call a
> 'str'
> print "MAP:", x, "<<x y>>", y
>
> def fillwith(fillchars):
> return fillchars
>
> for x,y in map(fillwith("N/A"), lista, listb): ########## Fails also -
> Can not call a 'str'
> print "MAP:", x, "<<x y>>", y
zip(lista + ['N/A'] * 2, listb)
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