Chain-calling parent initialisers in python

Question

Consider this - a base class A  class B inheriting from A  class C inheriting from B  What is a generic way to call a parent class initialiser in an initialiser  If this still sounds too vague  here s some code   class A object       def   init   self           print  Initialiser A was called   class B A       def   init   self           super B self    init             print  Initialiser B was called   class C B       def   init   self           super C self    init             print  Initialiser C was called   c   C     This is how I do it now  But it still seems a bit too non-generic - you still must pass a correct type by hand   Now  I ve tried using self   class   as a first argument to super    but  obviously it doesn t work - if you put it in the initialiser for C - fair enough  B s initialiser gets called  If you do the same in B   self  still points to an instance of C so you end up calling B s initialiser again  this ends in an infinite recursion    There is no need to think about diamond inheritance for now  I am just interested in solving this specific problem

User · Answer

Python 3 includes an improved super   which allows use like this   super     init   args

User · Answer

The way you are doing it is indeed the recommended one  for Python 2 x     The issue of whether the class is passed explicitly to super is a matter of style rather than functionality  Passing the class to super fits in with Python s philosophy of  explicit is better than implicit

User · Answer

You can simply write      class A object        def   init   self           print  Initialiser A was called   class B A        def   init   self           A   init   self            A   init   self  lt parameters gt   if you want to call with parameters         print  Initialiser B was called   class C B        def   init   self             A   init   self    if you want to call most super class            B   init   self          print  Initialiser C was called

[python] Chain-calling parent initialisers in python

Examples related to python

Examples related to oop

Examples related to inheritance

Examples related to constructor