Something

class FooClass:  """ Some random class """  foostring = "this is foo's string"  def __init__(s, parent)    s.parent = parentclass 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"