On Mon, 20 Oct 2008 13:16:48 +0200, Alfons Nonell-Canals wrote:
> Hello,
> I have a trouble and I don't know how to solve it. I am working with
> molecules and each molecule has a number of atoms. I obtain each atom
> spliting the molecule.
>
> Ok. It is fine and I have no problem with it.
>
> The problem is when I have to work with these atoms. These atoms usually
> are only a letter but, sometimes it can also contain one o more numbers.
> If they contein a number I have to manipulate them separately.
>
> If the number was allways the same I know how to identify them, for
> example, 1:
>
> atom = 'C1'
>
> if '1' in atom:
> print 'kk'
>
> But, how can I do to identify in '1' all possibilities from 1-9, I
> tried:
>
> if '[1-9]', \d,...
>
That's the job of regular expression: 'import re'
numbered_atom = re.compile('[A-Z][a-z]?[0-9]+')
if numbered_atom.match('C10'):
# this is a numbered atom
if numbered_atom.match('C'):
# this WON'T match
read more about regular expression on the web (hint: python share the
same re syntax with many other languages, php, javascript, grep, etc)
--
http://mail.python.org/mailman/listinfo/python-list
