def verification_user(id, user):
 conferences = get_memcached(get_key('conferences'))
 if (user not in conferences[id]['users'].keys()):
  return False
 return True

def verification_user ( id , user ) : conferences = get_memcached ( get_key ( 'conferences' ) ) if ( user not in conferences [ id ] [ 'users' ] . keys ( ) ) : return False return True
verification user in conference return true if the user is present in conference .