parent_constructor_invoke_test.py

class First(object):
    def __init__(self, a, b):
        self.x = "first init %s" % a
        self.y = "first init %s" % b
        print "invoked!"


class Second(First):
    pass


if __name__ == '__main__':
    """
    $ python test.py 
    invoked!
    hoge.x: first init 1
    hoge.y: first init 2
    invoked!
    fuga.x: first init 3
    fuga.y: first init 4
    """

    hoge = First("1", "2")
    print "hoge.x: %s" % hoge.x
    print "hoge.y: %s" % hoge.y

    fuga = Second("3", "4")
    print "fuga.x: %s" % fuga.x
    print "fuga.y: %s" % fuga.y