[Python-mode] huge files

[Andrea Crotti]

It looks like it's a common "problem" in the Elisp world, but I was
wondering is it normal to have huge source files.

python-mode.el is > 10k lines now, which for me causes two problems:
- it's hard to even know the various functionalities
- it's hard to manage the file

I see various things that could be very easily splitted
- virtualenv
- ipython
- pdbtrack (maybe)
- defcustom-defvar (or maybe better by topic taking the variables together)

and probably more.
Since it doesn't do any difference in terms of performance and it's
much less intimidating to try to grasp, is there a reason to keep all in
one big file?