How to properly package/distribute a pure python module?

[Matt Shomphe]

Are there any guidelines for packaging a pure python module? 
Specifically, say I have a set of 10 functions, all of varying
behaviors (no unifying theme to bind them together into clear
subsets), that I would like to make available to others.  What is the
best structure for the distributed module?  A single file called
"functions.py" that people can put in "site-packages"[1]?  A
subdirectory called "MyFunctions" with an "__init__.py" and the
"functions.py" files[2]?  Or should the functions be broken out into
individual files[3]?

I'm sure it depends on some other factorsbut are there general rules
for constructing a nice, logical package for others to use?

[1] site-packages/functions.py (from functions import f1)
[2] site-packages/MyFunctions/functions.py, __init__.py (from
MyFunctions.functions import f1)
[3] site-packages/MyFunctions/__init__.py, f1.py, f2.py, f3.py (from
MyFunctions.f1 import f1)