#  Highmiddlelow.py  Copyright (c) Kari Laitinen

#  http://www.naturalprogramming.com

#  2006-05-06  File created.
#  2022-12-18  Converted to Python 3.

#  It seems that the rule in Python is that the constructor
#  of the immediate superclass is not called automatically
#  if "this" class, i.e., the class that is being instantiated,
#  has a constructor. If there is no constructor in "this"
#  class, the constructor of the immediate superclass is 
#  executed because the constructor, i.e., the __init__()
#  method, is inherited.

#  In the class hierarchy below, the constructors of superclasses
#  are called from the low class constructors.


class MemberClass  :

   def __init__( self, object_identifier ) :

      print( "\n MemberClass object \"%s\" was created."  %   \
             object_identifier, end="" )



class HighClass  :

   def __init__( self )  :

      print( "\n The constructor of HighClass started.", end="" )

      self.some_data_member     =  MemberClass( "some_data_member" )
      self.another_data_member  =  MemberClass( "another_data_member" )

      print( "\n The constructor of HighClass ended.", end="" )



class MiddleClass ( HighClass )  :

   def __init__( self )  :

      print( "\n The constructor of MiddleClass started.", end="" )

      HighClass.__init__( self )  #  calling the superclass constructor

      print( "\n The constructor of MiddleClass ended.", end="" )



class LowClass ( MiddleClass )  :

   def __init__( self )  :

      print( "\n The constructor of LowClass started.", end="" )

      MiddleClass.__init__( self )  #  calling the superclass constructor

      self.data_member_in_low_class  =  MemberClass( "data_member_in_low_class" )

      print( "\n The constructor of LowClass ended.", end="" )




#  The main program.

low_class_object  =  LowClass()




#
#  The author of this program has done his best to ensure the accuracy of
#  information presented in this source program file. However,
#  the author assumes no responsibility for errors in this program.
#  The author shall not be liable in any event for incidental or
#  consequential damages in connection with, or arising out of,
#  any kind of use of this program or other information provided at
#  the Internet site naturalprogramming.com
#