Ridiculosly simple command line calculator, written in bash and uses python.
You need Python, then run this:
git clone https://github.com/TheGamingCoderNoob/calc.git
then, if you want to have it in path, run this:
sudo mv calc /usr/local/bin/.
For a simple calculation, you can run it like calc 2+2.
If you need an external python library like math, add it as an argument like calc "math.sin(90)" math (note the quotes. This is to stop the shell breaking things.).
May add to this, but for now this is it.