noinit.py

class Hoge():
    def __init__(self):
        def disabled_init(self):
            raise NotImplementedError('__init__ disabled')
        Hoge.__init__ = disabled_init

if __name__ == '__main__':
    print 'h = Hoge()'
    h = Hoge()
    print 'h2 = Hoge()'
    h2 = Hoge()