I like and use this calculator, but it has one glaring fault: no modulus operation. I doubt I could even write a program for a calculator without doing one modulus, so I'm mystified why it wasn't included as a basic operation.

The author knows it's a desired feature, but it hasn't been rolled in yet - that I know of.

Three things I particularly like in this vs. my past use of just a Python shell:

- persistent history over sessions

- syntax highlighting

- variable side window lets you see current values of the variables that are in scope (View->Variables)

There's a lot of other features, too. The built-in functions list is extensive.