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def get_g(self):
    return g
def set_g(self, _g):
    global g
    g = _g
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class A(object):
    pass
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setattr(A, 'g', property(get_g, set_g))
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def get_pp(name):
    def get_g(self):
        return globals()[name]
    def set_g(self, _g):
        globals()[name] = _g
    return property(get_g, set_g)
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class MyShell(Cmd):
    def preloop(self):
        print "print this line before entering the loop"
            
    def postloop(self):
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