python os library source code location
<p>I'm in learning mode --- this is probably a dumb or rtfm question but here it is:
Where is the source code for the Python os library located? I've downloaded the Python tarball. Lots of usages in there but can't seem to find the source code itself and how it hooks into the OS. I'm interested in seeing what's done for the os.* calls (e.g. os.read, os.write...). I've looked in  *builtin* files but didn't see anything there. 
Thanks for the hints.</p>
