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Newsgroups: comp.lang.python
From: Ramchandra Apte <maniandra...@gmail.com>
Date: Sat, 29 Sep 2012 06:46:22 -0700 (PDT)
Local: Sat, Sep 29 2012 9:46 am
Subject: Re: using "*" to make a list of lists with repeated (and independent) elements
On Thursday, 27 September 2012 04:14:42 UTC+5:30, Tim Chase wrote:
88888 Dihedral is a bot.
> On 09/26/12 17:28, 88888 Dihedral wrote: > > 88888 Dihedral於 2012年9月27日星期四UTC+8上午6時07分35秒寫道：
> >>>> In these conditions, how to make this list [[0,0,0],[0,0,0]] with "*" > >>>> without this behavior?
> >>> >>> a = [[0]*3 for i in xrange(2)]
> >>> >>> a[0][0]=2
> >>> >>> a
> >>> [[2, 0, 0], [0, 0, 0]]
> > def zeros(m,n):
> > a=[]
> > for i in xrange(m):
> > a.append([0]*n)
> > return a
> > If one wants to tranlate to C, this is the style.
> But this is Python, so why the heck would anybody want to emulate
> *C* style? It could also be written in an assembly-language style,
> COBOL style, or a Fortran style...none of which are particularly
> valuable.
> Besides, a C-style would allocate a single array of M*N slots and
> then calculate 2d offsets into that single array. :-P
> -tkc
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