Good practice when writing modules...

[r0g]

I'm collecting together a bunch of fairly random useful functions I have
written over the years into a module. Generally speaking is it best to

a) Import all the other modules these functions depend on into the
modules global namespace by putting them at the top of the module or
should I...

b) Include them in each function individually.

Stylistically I like the idea of b) better as it makes for easy
refactoring in the future but is there any drawback to doing it this
way? i.e. does it get repeatedly parsed, use more memory, become
inefficient when several functions that use the same includes are
invoked etc Or does it really not matter?

Performance is probably not important for the majority of these
functions but there's the odd one that may end up in an inner loop some day.

Cheers,

Roger.