gistfile1.py

class A():
	def __init__(self):
		self._label()

	def _label(self):
		self.show("A::_label")

	def show(self, msg):
		print msg

class B(A):
	def __init__(self):
		A.__init__(self)

	def _label(self):
		self.show("B::_label")


o=B()

# B::_label