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InitCallsSubclassMethod.py

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#Superclass __init__ calls subclass method

class Super(object):

def __init__(self, arg):

self._state = "Not OK"

self.set_up(arg)

self._state = "OK"

def set_up(self, arg):

"Do some set up"

class Sub(Super):

def __init__(self, arg):

Super.__init__(self, arg)

self.important_state = "OK"

def set_up(self, arg):

Super.set_up(self, arg)

"Do some more set up" # Dangerous as self._state is "Not OK"

#Improved version with inheritance:

class Super(object):

def __init__(self, arg):

self._state = "Not OK"

self.super_set_up(arg)

self._state = "OK"

def super_set_up(self, arg):

"Do some set up"

class Sub(Super):

def __init__(self, arg):

Super.__init__(self, arg)

self.sub_set_up(self, arg)

self.important_state = "OK"

def sub_set_up(self, arg):

"Do some more set up"