How to flatten a python nested list(tuple) - generator

flatten.py

#!/usr/bin/env python3

import collections

def flatten(t):
  """
  Generator flattening the structure
  
  >>> list(flatten([2, [2, (4, 5, [7], [2, [6, 2, 6, [6], 4]], 6)]]))
  [2, 2, 4, 5, 7, 2, 6, 2, 6, 6, 4, 6]
  """
  for x in t:
    if not isinstance(x, collections.Iterable):
      yield x
    else:
      yield from flatten(x)