PyDev multiple source files?

[RossGK]

Newbie questions on PyDev project setup.   Things are going fine -
writing python code in eclipse/pydev and running them with various
imports etc, doing wxpython stuff blah, blah, blah. My .py code is in
a module, in a package, in a project. It runs fine.

Now I want to be able to break my single source file up into multiple
files to segregate functions, divide up with others, etc, but I don't
know how to configure it. I pulled one simple class definition out of
my single source file and created a new .py file with just that in
there. But now I'm stalled...

What is the equivalent of an 'include' statement. I assume there's
something I put into one .py file to say I'm using stuff in another
local .py file.   I tried using "import" but it doesn't seem to work -
ie code doesn't know about the class in the other file.

Also, how about global vars that are needed across multiple .py files?
Where do I declare them to be understood in all the files that use
that global.

I suspect there is something I do in __init__.py - perhaps the
equivalent of 'include' statements in there with all my globals
stuffed in there too???   I'm lost here, but will continue to play
with it.  Any hints appreciated.  Surely all python developers don't
cram everything into one huge file (I hope).

Ross.