execfile python3k

[Odys]

Hi there,

Since execfile() is removed in Python 3.0
I have question about using exec.

I know about
  exec(open('filename').read())
but from documentation the 1st arg of exec can be 'file object'.
However
   exec(open('filename'))
does not work.
Does anybody have idea how to construct 'file object' then?

Thanks,