Python allows free creation of plots, unlike expensive, stagnant graphing calculators. Import NumPy and Matplotlib for basic ...

Adafruit has this week announced the availability and arrival of the NumWorks Graphing Calculator ... a Python interpreter built in. “This truly modern tool encourages curiosity in programming ...

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.