Can Python be written in Python?

[Aaron K. Johnson]

Here's a question for a computer scientist:

Can python be written in python? (a la scheme or lisp)

can the set of C primitives be smaller than present, and the rest of the
language bootstrapped?

The psyco web page talks about this as a key idea (I didn't quite understand it
though--it didn't go into detail--but it said that theoretically, and
counter-intuitivally, that this could lead to a speed up in the interpreter by
several multiples. Is this true? If so its beautiful and fascinating!)

Thanks,
Aaron.