The Python scientific stack, compiled to WebAssembly

Pyodide

The Python scientific stack, compiled to WebAssembly.

It provides transparent conversion of objects between Javascript and Python. When inside a browser, this means Python has full access to the Web APIs.

While closely related to the iodide project , Pyodide may be used standalone in any context where you want to run Python inside a web browser.

See the demo

Building

These instructions were tested on Linux. OSX should be mostly the same.

Make sure the prerequisites for emsdk are installed. Pyodide will build a custom, patched version of emsdk, so there is no need to build it yourself prior.

Additional build prerequisites are:

• A working native compiler toolchain, enough to build CPython.
• A native Python 3.6 or later to run the build scripts.
• PyYAML
• lessc to compile less to css.
• uglifyjs to minify Javascript builds.
• ccache (optional) recommended for much faster rebuilds.

make

Testing

Install the following dependencies into the default Python installation:

pip install pytest selenium pytest-instafail

Install geckodriver and chromedriver somewhere on your PATH .

make test

Benchmarking

Install the same dependencies as for testing.

make benchmark

Linting

Python is linted with flake8 . C and Javascript are linted with clang-format .

make lint