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Hmm, the __exit__ method was doing exact matches by exception type, so KeyError wouldn't match LookupError or Exception.
There are probably a number of ways to fix this, but it may be easiest to use the builtin exception catching mechanisms:
class Ignore:
 ''' Context manager to ignore particular exceptions'''
 def __init__(self, *ignored_exceptions):
 self.ignored_exceptions = ignored_exceptions
 def __enter__(self):
 return self
 def __exit__(self, exctype, excinst, exctb):
 if exctype is not None:
 try:
 raise
 except self.ignored_exceptions:
 return True