How to use python to determine whether a list contains an element

In python, you can use the in and not in keywords to determine whether a list contains an element

pythontab = ['p','y','t','h','o','n','t','a','b']
if 't' in pythontab:
    print 't in pythontab'
if 'w' not in pythontab:
    print 'w is not in pythontab'

in and not in are very commonly used Keywords.

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