在A - > B - > C继承链中不调用构造函数B.

Question

I have the following inheritance chain:

class Foo(object):
    def __init__(self):
        print 'Foo'

class Bar(Foo):
    def __init__(self):
        print 'Bar'
        super(Foo, self).__init__()

class Baz(Bar):
    def __init__(self):
        print 'Baz'
        super(Bar, self).__init__()

When instantiating Baz class the output is:

Baz

Foo

Why isn't Bar's constructor isn't called?

Answer 1

The call to super() takes the current class as the first argument, not the super class ( super() works that out for itself). In this case, the following should fix it... note the change to both super() calls:

class Foo(object):
    def __init__(self):
        print 'Foo'

class Bar(Foo):
    def __init__(self):
        print 'Bar'
        super(Bar, self).__init__()

class Baz(Bar):
    def __init__(self):
        print 'Baz'
        super(Baz, self).__init__()