Python delete in a string

Question

I have these 3 strings:

YELLOW,SMALL,STRETCH,ADULT,T21fdsfdsfs
YELLOW,SMALL,STRETCH,ADULT,Tdsfs
YELLOW,SMALL,STRETCH,ADULT,TD

Answer 1

According to The Zen of Python:

There should be one-- and preferably only one --obvious way to do it.

...so here's a third, which uses rpartition:

>>> for item in catalogue:
...     print item.rpartition(',')[0]
... 
YELLOW,SMALL,STRETCH,ADULT
YELLOW,SMALL,STRETCH,ADULT
YELLOW,SMALL,STRETCH,ADULT

I haven't compared its performance against the previous two answers.