spilt a string in python

Question

I want to split a string so that I always return everything BEFORE the LAST underscore

HELLO_xxxxxxxx.lst # should return HELLO
HELLO_GOODBYE_xxxxxxxx.ls # should return HELLO_GOODBYE

I have tried with rsplit but cannot get it to work.

Answer 1

str.split takes a limit argument. Try your_string.split(_, 1)

Answer 2

mystr.rsplit("_",1)[0]

Answer 3

.rsplit takes an optional "how many splits do you want?" parameter that defaults to giving you all of them. Just ask for one right-most split:

 TESTS = [
   ("HELLO_xxxxxxx.lst", "HELLO"),
   ("HELLO_GOODBYE_xxxxx.ls", "HELLO_GOODBYE"),
 ]

 for input, expected in TESTS:
 result = input.rsplit('_', 1)[0]
 if result == expected:
 verdict = "passed"
 else:
 verdict = "failed"
 print "%r -> %r == %r (%s)" % (input, result, expected, verdict,)