Popular Python projects with lots of pure Python code

[Brett C.]

For my thesis (once the bloody thing stops throwing bugs at me) I am 
going to need to collect stats on the frequency that atomic types in 
local variables are applied to various opcodes and methods.  That means 
that I need something to collect stats off of.

So I am trying to come up with a list of projects I can use to get my 
stats from.  the stdlib is a no-brainer.  Also plan to use Docutils. 
But beyond those most of the big Python projects I can think of have a 
ton of C code which is of no use to me.  I don't need to be able to run 
it, just going to be compiling to .py files.

Any suggestions?

-Brett