How can I ignore ValueError when I try to remove an element from a list?

Question

How can I ignore the \"not in list\" error message if I call a.remove(x) when x is not present in list a?

This is my situation:

Answer 1

I'd personally consider using a set instead of a list as long as the order of your elements isn't necessarily important. Then you can use the discard method:

>>> S = set(range(10))
>>> S
set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
>>> S.remove(10)
Traceback (most recent call last):
  File "", line 1, in 
KeyError: 10
>>> S.discard(10)
>>> S
set([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])