A Scheme kernel for Jupyter that can use Python libraries

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Calysto Scheme is a real Scheme programming language, with full support for continuations, including call/cc. It can also use all Python libraries. Also has some extensions that make it more useful (stepper-debugger, choose/fail, stack traces), or make it better integrated with Python.

In Jupyter notebooks, because Calysto Scheme uses [MetaKernel](https://github.com/Calysto/metakernel/blob/master/README.rst), it has a fully-supported set of “magics”—meta-commands for additional functionality. This includes running Scheme in parallel. See all of the [MetaKernel Magics](https://github.com/Calysto/metakernel/blob/master/metakernel/magics/README.md).

Calysto Scheme is written in Scheme, and then translated into Python (and other backends). The entire functionality lies in a single Python file: https://github.com/Calysto/calysto_scheme/blob/master/calysto_scheme/src/Scheme.py However, you can easily install it (see below).

Calysto Scheme in use:

You can install Calysto Scheme with Python3:

` pip3 install --upgrade calysto-scheme --user python3 -m calysto_kernel install --user `

or in the system kernel folder with:

` sudo pip3 install --upgrade calysto-scheme sudo python3 -m calysto_kernel install `

Change pip3/python3 to use a different pip or Python. The version of Python used will determine how Calysto Scheme is run.

Use it in the console, qtconsole, or notebook with IPython 3:

` ipython console --kernel calysto_scheme ipython qtconsole --kernel calysto_scheme ipython notebook --kernel calysto_scheme `

Requires:

  • ipython=>3.0

  • Python2 or Python3

  • metakernel (installed automatically)

Calysto Scheme supports:

  • continuations

  • use of all Python libraries

  • choose/fail

  • produces stack trace (with line numbers), like Python

  • test suite

Planned:

  • Object-oriented class definitions and instance creation

  • complete Scheme functions (one can fall back to Python for now)

Limitations:

  • Currently a couple of magnitudes slower than Python

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