Hi, IronPython ignores the dont_inherit compiler flag: IronPython Beta 6: >>> from __future__ import division >>> exec(compile("print 2/3", "<string>", "exec", 0, 1), {}) 0.666666666667 CPython: >>> from __future__ import division >>> exec(compile("print 2/3", "<string>", "exec", 0, 1), {}) 0 Andrzej Krzywda