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class CallSuper(Exception): pass');document.writeln('');document.writeln('');document.writeln('def callsuper(method):');document.writeln('    """');document.writeln('    Decorator for calling the super method automagically.');document.writeln('    ');document.writeln('    In the submethod, if a ``CallSuper`` exception is raised at any point, then');document.writeln('    the wrapper will look up the class's MRO (method resolution order) for a');document.writeln('    method of the same name. If none is found, the exception is allowed to');document.writeln('    permeate. If one is found, it too is wrapped with the ``callsuper``');document.writeln('    decorator and called with the arguments passed to ``CallSuper.__init__()``.');document.writeln('    """');document.writeln('    def callsuper_wrapper(self, *args):');document.writeln('        try:');document.writeln('            return method(self, *args)');document.writeln('        except CallSuper, exc:');document.writeln('            supermethod, name = None, method.__name__');document.writeln('            for base in self.__class__.mro()[1:]:');document.writeln('                if (hasattr(base, name) and');document.writeln('                    hasattr(getattr(base, name), '__call__')):');document.writeln('                    supermethod = callsuper(getattr(base, name))');document.writeln('                    break');document.writeln('            if not supermethod:');document.writeln('                raise');document.writeln('            return supermethod(self, *exc.args)');document.writeln('    callsuper_wrapper.__name__ = method.__name__');document.writeln('    callsuper_wrapper.__doc__ = method.__doc__');document.writeln('    return callsuper_wrapper');document.writeln('');document.writeln('# Test it out');document.writeln('');document.writeln('global COUNTER');document.writeln('COUNTER = 0');document.writeln('');document.writeln('class SuperClass(object):');document.writeln('    ');document.writeln('    def method(self):');document.writeln('        global COUNTER');document.writeln('        COUNTER += 1 # Increment counter.');document.writeln('');document.writeln('class SubClass(SuperClass):');document.writeln('    ');document.writeln('    @callsuper');document.writeln('    def method(self):');document.writeln('        global COUNTER');document.writeln('        COUNTER += 1 # Increment counter.');document.writeln('        raise CallSuper');document.writeln('');document.writeln('SubClass().method()');document.writeln('assert COUNTER == 2');document.writeln('
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