>>> import re
>>> S = "wall: 100, 50"
>>> m = re.match(r"^ *([^:]*) *: *([0-9]*) *, *([0-9]*) *$", S)
>>> print m.groups()
('wall', '100', '50')

from shlex import shlex
lex = shlex("wall:100, 50")
lex.get_token()
...

>>> S="wall:100, 50"
>>> name, coord = S.split(':',1)
>>> x, y = map( int, coord.split(',') )
>>> print name, x, y
wall 100 50