Dear Pypy group, Let me start by thanking you all for being so helpful in the past while I was learning to work with Pypy. I am trying to do research on how to type-def variables in Python at compile time. I have been reading different papers on bounds checking and static detection with scripting languages (for security), but I have not been able to find a feasible solution with Python. I was wondering if anyone knew some good references. I honestly cannot think of any way to type-def Python, except using heuristics to make guesses at what a variable might possibly be. Thank you in advance for your help, Brian