SymPy operates on symbols the way a numeric calculator or regular Python program works on numbers ... would with a graphing calculator in a stats class.

couldn't you write some program and also run it on my phone. It's sort of like a mini app that you can write in python and share with others. Here is another example - a tip calculator.

But now Texas Instruments is introducing a new TI-84 graphing calculator that supports programming in Python. Available beginning this fall, the TI-84 Plus CE Python graphing calculator will also ...