Python AST -> source code

[Ricardo Santos]

Hi,

I have a Python AST, which I have modified slightly (but still a valid
Python AST). How do I go back to its source code representation?

source code -> AST   (POSSIBLE)
AST -> source code   (????????)

Can someone point me to an open source solution? I don't want to have
to implement a "pretty printing" AST visitor myself.

Thanks

Ricardo Santos