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Pyodide Python compatibility

Python Standard library

Most of the Python standard library is functional, except for the modules listed in the sections below. A large part of the CPython test suite passes except for tests skipped in src/tests/python_tests.yaml or via patches.

Optional modules

The following stdlib modules are unvendored by default, in order to reduce initial download size of Python distribution. You can load all unvendored stdlib modules when initializing Pyodide with, loadPyodide({ fullStdLib : true }). However this has a significant impact on the download size. Instead, it is better to load individual modules as needed using {any}pyodide.loadPackage or {any}micropip.install.

distutils
ssl
lzma
sqlite3
test: it is an exception to the above, since it is not loaded even if fullStdLib is set to true.

Removed modules

The following modules are removed from the standard library to reduce download size and since they currently wouldn't work in the WebAssembly VM,

curses
dbm
ensurepip
idlelib
lib2to3
tkinter
turtle.py
turtledemo
venv
pwd

Included but not working modules

The following modules can be imported, but are not functional due to the limitations of the WebAssembly VM:

multiprocessing
threading
sockets

as well as any functionality that requires these.

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