def _different(difference_tuple):
 if difference_tuple:
  (member1, member2) = difference_tuple
  return (member1 != member2)
 else:
  return False

def _different ( difference_tuple ) : if difference_tuple : ( member1 , member2 ) = difference_tuple return ( member1 != member2 ) else : return False
return true if two elements of a tuple are different .