How to use 'if x in list python' in Python

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6def list_has(list, x):
7 try:
8 list.index(x)
9 return True
10 except ValueError:
11 return False
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231def is_comprehension(x):
232 """Returns true if this is a comprehension type."""
233 return isinstance(x, (ObjectComprehension, SetComprehension, ArrayComprehension))

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