[Tutor] Question about list

[Hoffmann]

--- Terry Carroll <carroll at tjc.com> wrote:

> On Mon, 10 Apr 2006, Hoffmann wrote:
> 
> > Hello,
> > 
> > I have a list: list1 =  [ 'spam!', 2, ['Ted',
> 'Rock']
> > ]
> > and I wrote the script below:
> > 
> > i = 0
> > while i < len(list1):
> >     print list1[i]
> >     i += 1
> > 
> > Ok. This script will generate as the output each
> > element of the original list, one per line:
> > 
> > spam!
> > 2
> > ['Ted', 'Rock']
> > 
> > I also would like to print the length of each
> element
> > of that list:
> > 
> > spam! = 1 element
> > 2 = 1 element
> > ['Ted', 'Rock'] = 2 elements
> 
> Well, the length of "spam!" is 5.  Lengths of
> strings express the number
> of characters.
> 
> You could check to see if it's a grouping-type of
> element -- i.e., a list, 
> tuple or set -- but I think your better approach is
> that, if this is 
> something you need, make all of the elements lists,
> some of which are 
> single-item lists; for example, instead of:
> 
>  list1 =  [ 'spam!', 2, ['Ted', 'Rock'] ]
> 
> use:
>  list1 =  [ ['spam!'], [2], ['Ted', 'Rock'] ]
> 
> >>> list1 =  [ ['spam!'], [2], ['Ted', 'Rock'] ]
> >>> for item in list1:
> ...  print item, len(item)
> ...
> ['spam!'] 1
> [2] 1
> ['Ted', 'Rock'] 2
> 
> If your heart is set on the other approach, though,
> it can be done:
> 
> >>> list1 =  [ 'spam!', 2, ['Ted', 'Rock'] ]
> >>> for item in list1:
> ...   if isinstance(item,(list, tuple, set)):
> ...     print item, len(item)
> ...   else:
> ...     print item, 1
> ...
> spam! 1
> 2 1
> ['Ted', 'Rock'] 2
> >>>
> 
> _______________________________________________
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> 

Hi Terry,

Your aproaches (mainly the last one!) answered my
question. After following your last approach, I got
what I was looking for.
Up to the page I am (page 84 of "How to think like a
computer scientist - learning with Python"), I didn't
see that nice approach.
Thanks!
Hoffmann

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