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

A good and thread-safe way to do this is to just try it and ignore the exception:

try:
    a.remove(10)
except ValueError:
    pass  # do nothing!