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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def password_change_done(self, request, extra_context=None):
 """ Displays the "success" page after a password change. """

        from django.contrib.auth.views import password_change_done
        defaults = {
            'extra_context': extra_context or {},
            'template_name': 'cms/password_change_done.html',
        }
        if self.password_change_done_template is not None:
            defaults['template_name'] = self.password_change_done_template
        return password_change_done(request, **defaults)