[Zope] importing an existing python module into Zope python script?

[Rachel Willmer]

This *must* be a FAQ, but I haven't found the answer anywhere despite 
all day looking...

I've got an existing python module with a large amount of code in it 
which I want to use both inside Zope and outside in existing python 
programs. The module is still under development so will change frequently.

Two burning questions:

a) How do I get access to the module within Zope ?

b) What do I then need to do to keep the versions in sync?

As far as I can see, I have at least 3 alternatives to question (a).

i) Copy it all into Zope, each function as a separate Zope python script 
(Ugh! and this then makes keeping it in sync outside Zope pretty darned 
difficult...)

ii) Keep the module as-is and add an External Method in Zope for each 
function that will be called from a Zope script. Pretty awful but 
do-able. But then I think I need to do something else in the Zope 
Management Interface each time I change the module? Is that right?

iii) Rewrite it all as a Zope Product?

There must be an easier answer that has eluded me to date....

Any answers appreciated...

Rachel