RevPo is an (intentionally) over-engineered evaluator and REPL for reverse Polish (aka postfix) notation expressions (test suite included).
In: '4 2 ** 1 +'
Out: 17
To run the test suite:
python revpo.py test
Or to pop straight into the REPL:
python revpo.py
The REPL accepts postfix expressions by default, but can also handle
prefix and infix expressions if they are prefixed with pre/in
followed by a space:
In: in (5 + ((1 + 2) * 4)) - 3
Out: 14