Idenfity numbers in variables

[Tim Chase]

> 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,...

You're reaching in the right direction (regexps), so just use 
Python's "re" module:

   import re
   digit = re.compile(r'\d') # or "[0-9]"
   for test in ["C1", "N98", "CJ", "3.141", "43+5i", ""]:
     print test,
     if digit.search(test):
       print "has",
     else:
       print "doesn't have",
     print "a digit in it"

The regexp can be tightened up if you want to ensure that it has 
a letter in front of it, or a number of other tests but that 
should be a decent start.

-tim