Python is one of the most popular programming languages around. Whether you are into DIY electronics, robots, AI, or data science, Python has something to offer. Pyto is a Python 3.8 IDE for iPhone an iPad that lets you run code directly on your device. You will be able to access scripts from everywhere and run them through Siri shortcuts.
You will be to install Python modules from PyPi. Numpy, Matplotlib, Pandas, Pillow, SciPy, SciKit-Learn, and a bunch of other popular libraries are already included. There is even an Apple Watch interface available for Pyto. You can find out more about it here.