using "*" to make a list of lists with repeated (and independent) elements

[Tim Chase]

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