Pulling python module up into package namespace

Question

If I have a directory structure like this:

package/
    __init__.py
    functions.py      #contains do()
    classes.py        #contains class A()

And I want to be able to call

import package as p

How do I make the contents of functions, classes, accessible as:

p.do()
p.A()

in stead of:

p.functions.do()
p.classes.A()

The subdivision in files is only there for convenience (allowing easier collaboration), but I'd prefer to have all the contents in the same namespace.