We have GP tools in GP toolbox OurServices.tbx and some of them are written in Python. We access them via geoprocessing services. However some Python functions are just copy-pasted from one GP function script to another.
The question is: Is it possible to embed a Python script, say our_utils.py, into the toolbox file (tbx) so in all our Python tools we are able to access shared functions like this:
import our_utils our_utils.sharedFunc()
We don't want pack shared functions as separate GP tools and then use ModelBuilder; this approach is too heavyweight for the issue.
Bounty edit 1 (2015-05-05)
I feel I have to give a bounty to someone participating here. At least three beautiful minds were attracted by it so I don't want my bounty going to dust.
I don't have ArcGIS at my fingerprints at the moment but I've spent 30 to 40 mins today checking if @mr.adams hacks can be extended to server installations (geoprocessing rest services). And, surprisingly, it worked with some additional hacks!
The hacks were: after packaging to .sd file (still a mystery for me how to pack more than one tool) rename that file to .zip and add libraries folders (import mylib => you must add mylib folder into zip). Then rename .zip back to .sd.
So my modest bounty goes to @mr.adams. I won't mark his answer as true answer; I still need to find a simpler way.
For pure Pythonistas @Farid_Cher gave an excellent .pyt template. I hope many copypasters will use it.