def demandload(scope, modules):

    class d:

        def __getattr__(self, name):

            mod = self.__dict__["mod"]

            scope = self.__dict__["scope"]

            scope[mod] = __import__(mod, scope, scope, [])

            return getattr(scope[mod], name)

    for m in modules.split():

        dl = d()

        dl.mod = m

        dl.scope = scope

        scope[m] = dl