class FooClass:
  """ Some random class """
  foostring = "this is foo's string"

  def __init__(s, parent)
    s.parent = parent

class BarClass:
  """ Another class """

  def __init__(s):
    s.barfoo = FooClass(parent=s)

def main():
  newbar = BarClass()

  print newbar.parent.foostring
  # output == "this is foo's string"