Create list from string

ericdaniel eric.acevedo at gmail.com
Fri Jun 13 16:37:34 CEST 2008


Hi Chris,

Thank you very much, that was exactly what I needed.

Eric

On Jun 13, 9:29 am, Chris <cwi... at gmail.com> wrote:
> On Jun 13, 4:15 pm, ericdaniel <eric.acev... at gmail.com> wrote:
>
> > Hi,
>
> > I'm new to Python and I need to do the following:
>
> > from this:   s = "978654321"
> > to this :      ["978", "654", "321"]
>
> > Any help is appreciated
>
> > Thanks,
>
> > Eric
>
> What you could do is iterate over the string appending the characters
> 1 at a time to a new string and when you hit the point you want to
> place it in your output list you can append it there and clear the
> temp string eg.
>
> length = 3
> tmp_string = ''
> results = []
> for i,character in enumerate(s):
>     if not (i+1) % length:
>         results.append(tmp_string)
>     else:
>         tmp_string += character
>
> I don't like this approach as you create to many temp items and fairly
> ugly.
> What you could do is to rather use slicing to build it.
>
> results = []
> length = 3
> for i in xrange(0,len(s),length):
>     results.append(s[i:i+length])
>
> And then the neatest approach would be to put that into a list
> comprehension instead
>
> s = "978654321"
> step = 3
> output = [s[start:start+step] for start in xrange(0,len(s),step)]
>
> Those are just some ways to do it.
> Hope that helps




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