python flattening an iterable

this should work on any iterable
flatten = lambda t: sum(map(flatten, t), ()) if hasattr(t, ‘__iter__’) else (t,)

this is just for tuples

def flatten(tpl):
   return sum(map(flatten, tpl), ()) if type(tpl) is tuple else (tpl,)
  
t= (1, (1, 2, (1, 2, 3), 3))
print flatten(t)