inherit.py

class Base(object):
  def public(self):
    print "base:public"

  def call_private(self):
    self._private()

  def call_hidden(self):
    self.__hidden()

  def _private(self):
    print "base:private"

  def __hidden(self):
    print "base:hidden"

class Sub(Base):
  def public(self):
    print "sub:public"

  def _private(self):
    print "sub:private"

  def __hidden(self):
    print "sub:hidden"

s = Sub()
s.public()       # sub:public
s.call_private() # sub:private
s.call_hidden()  # base:hidden