tiissa <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> Synonymous wrote:
> > tiissa <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>...
> >
> >>tiissa wrote:
> >>
> >>>If you know the number of characters to match can't you just compare
> >>>slices?
> >>
> >>If you don't, you can still do it by hand:
> >>
> >>In [7]: def cmp(s1,s2):
> >> ....: diff_map=[chr(s1[i]!=s2[i]) for i in range(min(len(s1),
> >>len(s2)))]
> >> ....: diff_index=''.join(diff_map).find(chr(True))
> >> ....: if -1==diff_index:
> >> ....: return min(len(s1), len(s2))
> >> ....: else:
> >> ....: return diff_index
> >> ....:
> >
> > I will look at that, although if i have 300 images i dont want to type
> > all the comparisons (In [9]: cmp('ccc','cccap')) by hand, it would
> > just be easier to sort them then :).
>
> I didn't meant you had to type it by hand. I thought about writing a
> small script (as opposed to using some in the standard tools). It might
> look like:
>
> In [22]: def make_group(L):
> ....: root,res='',[]
> ....: for i in range(1,len(L)):
> ....: if ''==root:
> ....: root=L[i][:cmp(L[i-1],L[i])]
> ....: if ''==root:
> ....: res.append((L[i-1],[L[i-1]]))
> ....: else:
> ....: res.append((root,[L[i-1],L[i]]))
> ....: elif len(root)==cmp(root,L[i]):
> ....: res[-1][1].append(L[i])
> ....: else:
> ....: root=''
> ....: if ''==root:
> ....: res.append((L[-1],[L[-1]]))
> ....: return res
> ....:
>
> In [23]: L=['cccat','cccap','cccan','dddfa','dddfg','dddfz']
>
> In [24]: L.sort()
>
> In [25]: make_group(L)
> Out[25]: [('ccca', ['cccan', 'cccap', 'cccat']), ('dddf', ['dddfa',
> 'dddfg', 'dddfz'])]
>
>
> However I guarantee no optimality in the number of classes (but, hey,
> that's when you don't specify the size of the prefix).
> (Actually, I guarantee nothing at all ;p)
> But in particular, you can have some file singled out:
>
> In [26]: make_group(['cccan','cccap','cccat','cccb'])
> Out[26]: [('ccca', ['cccan', 'cccap', 'cccat']), ('cccb', ['cccb'])]
>
>
> It is a matter of choice: either you want to specify by hand the size of
> the prefix and you'd rather look at itertools as pointed out by Kent, or
> you don't and a variation with the above code might do the job.
Thank you, that is very kool I found out how to copy files finally
with shutil too, so i'm getting close to doing something. Going to be
working on an old computer, playing with files = dangerous lol.
Thanks for your help and taking the time to post!
Bye :o)
S M
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