Inheritance and constructors in Python

python_constructors.py

#!/bin/env/python

# How inheritance of constructors in python works.
# Only simple cases without multiple inheritance are covered.
class A(object):
	"""No inheritance"""
	def __init__(self):
		print "A"

class B(A):
	"""Constructor overriden, parent is lost"""
	def __init__(self):
		print "B"

class C(A):
	"""No constructor in child, parent is preserved"""
	pass

class D(A):
	"""Constructor overriden, parent explicitly called"""
	def __init__(self):
		super(D,self).__init__()
		print "D"

A()
print "---"
B()
print "---"
C()
print "---"
D()