Source files?

[Jive Dadson]

I just learned about Python a couple of days ago.  A customer suggested
we use it (rather than Java) for an application interface.  So, I
downloaded the latest beta version, Python-2_2b1.exe, and installed it. 
I was under the impression that it came with open source.  I can't find
any source files.  Dot-h, yes.  Dot-c or dot-cpp, no.  How does one
obtain them?

Best regards,
Jive