contains = {}
for c in 'aeiou':
  contains[c] = lambda s: c in s


contains['u']('food')     # => False   ( expected)
contains['u']('zuul')     # => True    ( expected)

contains['a']('barn')     # False      ( ??? )
contains['a']('zuul')     # True       ( ??? )


# Taken from http://wiki.europython.eu/TalkMaterials?action=AttachFile&do=get&target=pythonsucks.pdf