1 def demandload(scope, modules):

     2     class d:

     3         def __getattr__(self, name):

     4             mod = self.__dict__["mod"]

     5             scope = self.__dict__["scope"]

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

     7             return getattr(scope[mod], name)

     8 

     9     for m in modules.split():

    10         dl = d()

    11         dl.mod = m

    12         dl.scope = scope

    13         scope[m] = dl

    14 

    15