Release notes

Version 0.16.1

December 25, 2020

Note: due to a CI deployment issue the 0.16.0 release was skipped and replaced by 0.16.1 with identical contents.

  • Pyodide files are distributed by JsDelivr, https://cdn.jsdelivr.net/pyodide/v0.16.1/full/pyodide.js The previous CDN pyodide-cdn2.iodide.io still works and there are no plans for deprecating it. However please use JsDelivr as a more sustainable solution, including for earlier pyodide versions.

Python and the standard library

  • Pyodide includes CPython 3.8.2 #712

  • ENH Patches for the threading module were removed in all packages. Importing the module, and a subset of functionality (e.g. locks) works, while starting a new thread will produce an exception, as expected. #796. See #237 for the current status of the threading support.

  • ENH The multiprocessing module is now included, and will not fail at import, thus avoiding the necessity to patch included packages. Starting a new process will produce an exception due to the limitation of the WebAssembly VM with the following message: Resource temporarily unavailable #796.

Python / JS type conversions

  • FIX Only call Py_INCREF() once when proxied by PyProxy #708

  • Javascript exceptions can now be raised and caught in Python. They are wrapped in pyodide.JsException. #891

pyodide-py package and micropip

  • The pyodide.py file was transformed to a pyodide-py package. The imports remain the same so this change is transparent to the users #909.

  • FIX Get last version from PyPi when installing a module via micropip #846.

  • Suppress REPL results returned by pyodide.eval_code by adding a semicolon #876.

  • Enable monkey patching of eval_code and find_imports to customize behavior of runPython and runPythonAsync #941.

Build system

  • Updated docker image to Debian buster, resulting in smaller images. #815

  • Pre-built docker images are now available as iodide-project/pyodide #787

  • Host python is no longer compiled, reducing compilation time. This also implies that python 3.8 is now required to build pyodide. It can for instance be installed with conda. #830

  • FIX Infer package tarball directory from source url #687

  • Updated to emscripten 1.38.44 and binaryen v86 (see related commits)

  • Updated default --ldflags argument to pyodide_build scripts to equal what pyodide actually uses. #817

  • Replace C lz4 implementation with the (upstream) Javascript implementation. #851

  • Pyodide deployment URL can now be specified with the PYODIDE_BASE_URL environment variable during build. The pyodide_dev.js is no longer distributed. To get an equivalent behavior with pyodide.js, set,

    window.languagePluginUrl = './';

    before loading it. #855

  • Build runtime C libraries (e.g. libxml) via package build system with correct dependency resolution #927

  • Pyodide can now be built in a conda virtual environment #835

Other improvements

  • Modifiy MEMFS timestamp handling to support better caching. This in particular allows to import newly created python modules without invalidating import caches #893

Packages

  • New packages: freesasa, lxml, python-sat, traits, astropy, pillow, scikit-image, imageio, numcodecs, msgpack, asciitree, zarr

    Note that due to the large size and the experimental state of the scipy package, packages that depend on scipy (including scikit-image, scikit-learn) will take longer to load, use a lot of memory and may experience failures.

  • Updated packages: numpy 1.15.4, pandas 1.0.5, matplotlib 3.3.3 among others.

  • New package pyodide-interrupt, useful for handling interrupts in Pyodide (see project descripion for details).

Backward incompatible changes

  • Dropped support for loading .wasm files with incorrect MIME type, following #851

List of contributors

abolger, Aditya Shankar, Akshay Philar, Alexey Ignatiev, Aray Karjauv, casatir, chigozienri, Christian glacet, Dexter Chua, Frithjof, Hood Chatham, Jan Max Meyer, Jay Harris, jcaesar, Joseph D. Long, Matthew Turk, Michael Greminger, Michael Panchenko, mojighahar, Nicolas Ollinger, Ram Rachum, Roman Yurchak, Sergio, Seungmin Kim, Shyam Saladi, smkm, Wei Ouyang

Version 0.15.0

May 19, 2020

  • Upgrades pyodide to CPython 3.7.4.

  • micropip no longer uses a CORS proxy to install pure Python packages from PyPi. Packages are now installed from PyPi directly.

  • micropip can now be used from web workers.

  • Adds support for installing pure Python wheels from arbitrary URLs with micropip.

  • The CDN URL for pyodide changed to https://pyodide-cdn2.iodide.io/v0.15.0/full/pyodide.js It now supports versioning and should provide faster downloads. The latest release can be accessed via https://pyodide-cdn2.iodide.io/latest/full/

  • Adds messageCallback and errorCallback to pyodide.loadPackage.

  • Reduces the initial memory footprint (TOTAL_MEMORY) from 1 GiB to 5 MiB. More memory will be allocated as needed.

  • When building from source, only a subset of packages can be built by setting the PYODIDE_PACKAGES environment variable. See partial builds documentation for more details.

  • New packages: future, autograd

Version 0.14.3

Dec 11, 2019

  • Convert JavaScript numbers containing integers, e.g. 3.0, to a real Python long (e.g. 3).

  • Adds __bool__ method to for JsProxy objects.

  • Adds a Javascript-side auto completion function for Iodide that uses jedi.

  • New packages: nltk, jeudi, statsmodels, regex, cytoolz, xlrd, uncertainties

Version 0.14.0

Aug 14, 2019

  • The built-in sqlite and bz2 modules of Python are now enabled.

  • Adds support for auto-completion based on jedi when used in iodide

Version 0.13.0

May 31, 2019

  • Tagged versions of Pyodide are now deployed to Netlify.

Version 0.12.0

May 3, 2019

User improvements:

  • Packages with pure Python wheels can now be loaded directly from PyPI. See Micropip for more information.

  • Thanks to PEP 562, you can now import js from Python and use it to access anything in the global Javascript namespace.

  • Passing a Python object to Javascript always creates the same object in Javascript. This makes APIs like removeEventListener usable.

  • Calling dir() in Python on a JavaScript proxy now works.

  • Passing an ArrayBuffer from Javascript to Python now correctly creates a memoryview object.

  • Pyodide now works on Safari.

Version 0.11.0

Apr 12, 2019

User improvements:

  • Support for built-in modules:

    • sqlite, crypt

  • New packages: mne

Developer improvements:

  • The mkpkg command will now select an appropriate archive to use, rather than just using the first.

  • The included version of emscripten has been upgraded to 1.38.30 (plus a bugfix).

  • New packages: jinja2, MarkupSafe

Version 0.10.0

Mar 21, 2019

User improvements:

  • New packages: html5lib, pygments, beautifulsoup4, soupsieve, docutils, bleach, mne

Developer improvements:

  • console.html provides a simple text-only interactive console to test local changes to Pyodide. The existing notebooks based on legacy versions of Iodide have been removed.

  • The run_docker script can now be configured with environment variables.