Question

Say, I have a class Foo, extending class Bar. And I want to slightly override Foo’s consructor. And I don’t want even know what signarure of Bar’s constructors is. Is there a way to do this?

If you didn’t understand, I mean the following:

class Bar:
   def __init__ (self, arg1=None, arg2=None, ... argN=None):
      ....


class Foo (Bar):
    #Here i just want add additional parameter to constructor, but don't want to know anything about Bar's other parameters (arg1, arg2..., argN)
    def __init__ (self, my_new_arg=None, ??? )
       self.new_arg = my_new_arg
       Bar.__init__(self, ??? )

Is there a way to put something short and elegant instead of ??? in this code?
(Maybe some variations of args/kwargs)

Answer 1

class Parent(object):
    def __init__(self, a, b):
        print 'a', a
        print 'b', b

class Child(Parent):
    def __init__(self, c, d, *args, **kwargs):
        print 'c', c
        print 'd', d
        super(Child, self).__init__(*args, **kwargs)

test = Child(1,2,3,4)

Output:

c 1
d 2
a 3
b 4