Change Log#

Unreleased#

  • Fix The standard library packages ssl and lzma can now be installed with pyodide.loadPackage("ssl") or micropip.install("ssl") (previously they had a leading underscore and it was only possible to load them with pyodide.loadPackage). #3003

  • Fix If a wheel path is passed to pyodide.loadPackage, it will now be resolved relative to document.location (in browser) or relative to the current working directory (in Node) rather than relative to indexURL. #3013, #3011

  • Fix Fixed a bug in Emscripten that caused Pyodide to fail in Jest. #3014

  • Fix It now works to pass a relative url to indexURL. Also, the calculated index URL now works even if node is run with --enable-source-maps. #3015

Version 0.21.1#

  • New packages: the standard library lzma module #2939

  • Enhancement Pyodide now shows more helpful error messages when importing unvendored or removed stdlib modules fails. #2973

  • Enhancement pyodide build now checks that the correct version of the Emscripten compiler is used. #2975, #2990

  • Fix Pyodide works in Safari v14 again. It was broken in v0.21.0 #2994

Version 0.21.0#

August 9, 2022

See the release notes for a summary.

Build system#

  • Enhancement Emscripten was updated to Version 3.1.14 #2775, #2679, #2672

  • Fix Fix building on macOS #2360 #2554

  • Enhancement Update Typescript target to ES2017 to generate more modern Javascript code. #2471

  • Enhancement We now put our built files into the dist directory rather than the build directory. #2387

  • Fix The build will error out earlier if cmake or libtool are not installed. #2423

  • Enhancement The platform tags of wheels now include the Emscripten version in them. This should help ensure ABI compatibility if Emscripten wheels are distributed outside of the main Pyodide distribution. #2610

  • Enhancement The build system now uses the sysconfigdata from the target Python rather than the host Python. #2516

  • Enhancement Pyodide now builds with -sWASM_BIGINT. #2643

  • Enhancement Added cross-script key to the meta.yaml spec to allow executing custom logic in the cross build environment. #2734

Pyodide Module and type conversions#

  • API Change All functions were moved out of the root pyodide package into various submodules. For backwards compatibility, they will be available from the root package (raising a FutureWarning) until v0.23.0. #2787, #2790

  • Enhancement loadPyodide no longer uses any global state, so it can be used more than once in the same thread. This is recommended if a network request causes a loading failure, if there is a fatal error, if you damage the state of the runtime so badly that it is no longer usable, or for certain testing purposes. It is not recommended for creating multiple execution environments, for which you should use pyodide.runPython(code, { globals : some_dict}); #2391

  • Enhancement pyodide.unpackArchive now accepts any ArrayBufferView or ArrayBuffer as first argument, rather than only a Uint8Array. #2451

  • Feature Added pyodide.code.run_js API. #2426

  • Fix BigInt’s between 2^{32*n - 1} and 2^{32*n} no longer get translated to negative Python ints. #2484

  • Fix Pyodide now correctly handles JavaScript objects with null constructor. #2520

  • Fix Fix garbage collection of once_callable #2401

  • Enhancement Added the js_id attribute to JsProxy to allow using JavaScript object identity as a dictionary key. #2515

  • Fix Fixed a bug with toJs when used with recursive structures and the dictConverter argument. #2533

  • Enhancement Added Python wrappers set_timeout, clear_timeout, set_interval, clear_interval, add_event_listener and remove_event_listener for the corresponding JavaScript functions. #2456

  • Fix If a request fails due to CORS, pyfetch now raises an OSError not a JSException. #2598

  • Enhancement Pyodide now directly exposes the Emscripten PATH and ERRNO_CODES APIs. #2582

  • Fix The bool operator on a JsProxy now behaves more consistently: it returns False if JavaScript would say that !!x is false, or if x is an empty container. Otherwise it returns True. #2803

  • Fix Fix loadPyodide errors for the Windows Node environment. #2888

  • Enhancement Implemented slice subscripting, +=, and extend for JsProxy of Javascript arrays. #2907

REPL#

  • Enhancement Add a spinner while the REPL is loading #2635

  • Enhancement Cursor blinking in the REPL can be disabled by setting noblink in URL search params. #2666

  • Fix Fix a REPL error in printing high-dimensional lists. #2517 #2919

  • Fix Fix output bug with using input() on online console #2509

micropip and package loading#

  • API Change packages.json which contains the dependency graph for packages was renamed to repodata.json to avoid confusion with package.json used in JavaScript packages.

  • Enhancement Added SHA-256 hash of package to entries in repodata.json #2455

  • Enhancement Integrity of Pyodide packages is now verified before loading them. This is for now limited to browser environments. #2513

  • Enhancement micropip supports loading wheels from the Emscripten file system using the emfs: protocol now. #2767

  • Enhancement It is now possible to use an alternate repodata.json lockfile by passing the lockFileURL option to loadPyodide. This is particularly intended to be used with micropip.freeze. #2645

  • Fix micropip now correctly handles package names that include dashes #2414

  • Enhancement Allow passing credentials to micropip.install() #2458

  • Enhancement micropip.install() now accepts a deps parameter. If set to False, micropip will not install dependencies of the package. #2433

  • Fix micropip now correctly compares packages with prerelease version #2532

  • Enhancement micropip.install() now accepts a pre parameter. If set to True, micropip will include pre-release and development versions. #2542

  • Enhancement micropip was refactored to improve readability and ease of maintenance. #2561, #2563, #2564, #2565, #2568

  • Enhancement Various error messages were fine tuned and improved. #2562, #2558

  • Enhancement micropip was adjusted to keep its state in the wheel .dist-info directories which improves consistenency with the Python standard library and other tools used to install packages. #2572

  • Enhancement micropip can now be used to install Emscripten binary wheels. #2591

  • Enhancement Added micropip.freeze to record the current set of loaded packages into a repodata.json file. #2581

  • Fix micropip.list now works correctly when there are packages that are installed via pyodide.loadPackage from a custom URL. #2743

  • Fix micropip now skips package versions which do not follow PEP440. #2754

  • Fix micropip supports extra markers in packages correctly now. #2584

Packages#

  • Enhancement Update sqlite version to latest stable release #2477 and #2518

  • Enhancement Pillow now supports WEBP image format #2407.

  • Enhancement Pillow and opencv-python now support the TIFF image format. #2762

  • Pandas is now compiled with -Oz, which significantly speeds up loading the library on Chrome #2457

  • New packages: opencv-python #2305, ffmpeg #2305, libwebp #2305, h5py, pkgconfig and libhdf5 #2411, bitarray #2459, gsw #2511, cftime #2504, svgwrite, jsonschema, tskit #2506, xarray #2538, demes, libgsl, newick, ruamel, msprime #2548, gmpy2 #2665, xgboost #2537, galpy #2676, shapely, geos #2725, suitesparse, sparseqr #2685, libtiff #2762, pytest-benchmark #2799, termcolor #2809, sqlite3, libproj, pyproj, certifi #2555, rebound #2868, reboundx #2909, pyclipper #2886, brotli #2925, python-magic #2941

Miscellaneous#

  • Fix We now tell packagers (e.g., Webpack) to ignore npm-specific imports when packing files for the browser. #2468

  • Enhancement run_in_pyodide now has support for pytest assertion rewriting and decorators such as pytest.mark.parametrize and hypothesis. #2510, #2541

  • BREAKING CHANGE pyodide_build.testing is removed. run_in_pyodide decorator can now be accessed through pytest-pyodide package. #2418

List of contributors#

Alexey Ignatiev, Andrey Smelter, andrzej, Antonio Cuni, Ben Jeffery, Brian Benjamin Maranville, David Lechner, dragoncoder047, echorand (Amit Saha), Filipe, Frank, Gyeongjae Choi, Hanno Rein, haoran1062, Henry Schreiner, Hood Chatham, Jason Grout, jmdyck, Jo Bovy, John Wason, josephrocca, Kyle Cutler, Lester Fan, Liumeo, lukemarsden, Mario Gersbach, Matt Toad, Michael Droettboom, Michael Gilbert, Michael Neil, Mu-Tsun Tsai, Nicholas Bollweg, pysathq, Ricardo Prins, Rob Gries, Roman Yurchak, Ryan May, Ryan Russell, stonebig, Szymswiat, Tobias Megies, Vic Kumar, Victor, Wei Ji, Will Lachance

Version 0.20.0#

See the release notes for a summary.

CPython and stdlib#

  • Update Pyodide now runs Python 3.10.2. #2225

  • Enhancement All ctypes tests pass now except for test_callback_too_many_args (and we have a plan to fix test_callback_too_many_args upstream). libffi-emscripten now also passes all libffi tests. #2350

Packages#

  • Fix matplotlib now loads multiple fonts correctly #2271

  • New packages: boost-histogram #2174, cryptography v3.3.2 #2263, the standard library ssl module #2263, python-solvespace v3.0.7, lazy-object-proxy #2320.

  • Many more scipy linking errors were fixed, mostly related to the Fortran f2c ABI for string arguments. There are still some fatal errors in the Scipy test suite, but none seem to be simple linker errors. #2289

  • Removed pyodide-interrupts. If you were using this for some reason, use setInterruptBuffer instead. #2309

  • Most included packages were updated to the latest version. See Packages built in Pyodide for a full list.

Type translations#

  • Fix Python tracebacks now include Javascript frames when Python calls a Javascript function. #2123

  • Enhancement Added a default_converter argument to JsProxy.to_py and pyodide.toPy which is used to process any object that doesn’t have a built-in conversion to Python. Also added a default_converter argument to PyProxy.toJs and pyodide.ffi.to_js to convert. #2170 and #2208

  • Enhancement Async Python functions called from Javascript now have the resulting coroutine automatically scheduled. For instance, this makes it possible to use an async Python function as a Javascript event handler. #2319

Javascript package#

  • Enhancement It is no longer necessary to provide indexURL to loadPyodide. #2292

  • BREAKING CHANGE The globals argument to runPython and runPythonAsync is now passed as a named argument. The old usage still works with a deprecation warning. #2300

  • Enhancement The Javascript package was migrated to Typescript. #2130 and #2133

  • Fix Fix importing pyodide with ESM syntax in a module type web worker. #2220

  • Enhancement When Pyodide is loaded as an ES6 module, no global loadPyodide variable is created (instead, it should be accessed as an attribute on the module). #2249

  • Fix The type Py2JsResult has been replaced with any which is more accurate. For backwards compatibility, we still export Py2JsResult as an alias for any. #2277

  • Fix Pyodide now loads correctly even if requirejs is included. #2283

  • Enhancement Added robust handling for non-Error objects thrown by Javascript code. This mostly should never happen since well behaved Javascript code ought to throw errors. But it’s better not to completely crash if it throws something else. #2294

pyodide_build#

  • Enhancement Pyodide now uses Python wheel files to distribute packages rather than the emscripten file_packager.py format. #2027

  • Enhancement Pyodide now uses pypa/build to build packages. We (mostly) use build isolation, so we can build packages that require conflicting versions of setuptools or alternative build backends. #2272

  • Enhancement Most pure Python packages were switched to use the wheels directly from PyPI rather than rebuilding them. #2126

  • Enhancement Added support for C++ exceptions in packages. Now C++ extensions compiled and linked with -fexceptions can catch C++ exceptions. Furthermore, uncaught C++ exceptions will be formatted in a human-readable way. #2178

  • BREAKING CHANGE Removed the skip-host key from the meta.yaml format. If needed, install a host copy of the package with pip instead. #2256

Uncategorized#

  • Enhancement The interrupt buffer can be used to raise all 64 signals now, not just SIGINT. Write a number between 1<= signum <= 64 into the interrupt buffer to trigger the corresponding signal. By default everything but SIGINT will be ignored. Any value written into the interrupt buffer outside of the range from 1 to 64 will be silently discarded. #2301

  • Enhancement Updated to Emscripten 2.0.27. #2295

  • BREAKING CHANGE The extractDir argument to unpackArchive is now passed as a named argument. The old usage still works with a deprecation warning. #2300

  • Enhancement Support ANSI escape codes in the Pyodide console. #2345

  • Fix pyodide_build can now be installed in non-editable ways. #2351

List of contributors#

Boris Feld, Christian Staudt, Gabriel Fougeron, Gyeongjae Choi, Henry Schreiner, Hood Chatham, Jo Bovy, Karthikeyan Singaravelan, Leo Psidom, Liumeo, Luka Mamukashvili, Madhur Tandon, Paul Korzhyk, Roman Yurchak, Seungmin Kim, Thorsten Beier, Tom White, and Will Lachance

Version 0.19.1#

February 19, 2022

Packages#

  • New packages: sqlalchemy #2112, pydantic #2117, wrapt #2165

  • Update Upgraded packages: pyb2d (0.7.2), #2117

  • Fix A fatal error in scipy.stats.binom.ppf has been fixed. #2109

  • Fix Type signature mismatches in some numpy comparators have been fixed. #2110

Type translations#

  • Fix The “PyProxy has already been destroyed” error message has been improved with some context information. #2121

REPL#

  • Enhancement Pressing TAB in REPL no longer triggers completion when input is whitespace. #2125

List of contributors#

Christian Staudt, Gyeongjae Choi, Hood Chatham, Liumeo, Paul Korzhyk, Roman Yurchak, Seungmin Kim, Thorsten Beier

Version 0.19.0#

January 10, 2021

See the release notes for a summary.

Python package#

  • Enhancement If find_imports is used on code that contains a syntax error, it will return an empty list instead of raising a SyntaxError. #1819

  • Enhancement Added the pyodide.http.pyfetch API which provides a convenience wrapper for the Javascript fetch API. The API returns a response object with various methods that convert the data into various types while minimizing the number of times the data is copied. #1865

  • Enhancement Added the unpack_archive API to the FetchResponse object which treats the response body as an archive and uses shutil to unpack it. #1935

  • Fix The Pyodide event loop now works correctly with cancelled handles. In particular, asyncio.wait_for now functions as expected. #2022

JavaScript package#

  • Fix loadPyodide no longer fails in the presence of a user-defined global named process. #1849

  • Fix Various webpack buildtime and runtime compatibility issues were fixed. #1900

  • Enhancement Added the pyodide.pyimport API to import a Python module and return it as a PyProxy. Warning: this is different from the original pyimport API which was removed in this version. #1944

  • Enhancement Added the pyodide.unpackArchive API which unpacks an archive represented as an ArrayBuffer into the working directory. This is intended as a way to install packages from a local application. #1944

  • API Change loadPyodide now accepts a homedir parameter which sets home directory of Pyodide virtual file system. #1936

  • BREAKING CHANGE The default working directory(home directory) inside the Pyodide virtual file system has been changed from / to /home/pyodide. To get the previous behavior, you can

    • call os.chdir("/") in Python to change working directory or

    • call loadPyodide with the homedir="/" argument #1936

Python / JavaScript type conversions#

  • BREAKING CHANGE Updated the calling convention when a JavaScript function is called from Python to improve memory management of PyProxies. PyProxy arguments and return values are automatically destroyed when the function is finished. #1573

  • Enhancement Added JsProxy.to_string, JsProxy.to_bytes, and JsProxy.to_memoryview to allow for conversion of TypedArray to standard Python types without unneeded copies. #1864

  • Enhancement Added JsProxy.to_file and JsProxy.from_file to allow reading and writing Javascript buffers to files as a byte stream without unneeded copies. #1864

  • Fix It is now possible to destroy a borrowed attribute PyProxy of a PyProxy (as introduced by #1636) before destroying the root PyProxy. #1854

  • Fix If __iter__() raises an error, it is now handled correctly by the PyProxy[Symbol.iterator()] method. #1871

  • Fix Borrowed attribute PyProxys are no longer destroyed when the root PyProxy is garbage collected (because it was leaked). Doing so has no benefit to nonleaky code and turns some leaky code into broken code (see #1855 for an example). #1870

  • Fix Improved the way that pyodide.globals.get("builtin_name") works. Before we used __main__.__dict__.update(builtins.__dict__) which led to several undesirable effects such as __name__ being equal to "builtins". Now we use a proxy wrapper to replace pyodide.globals.get with a function that looks up the name on builtins if lookup on globals fails. #1905

  • Enhancement Coroutines have their memory managed in a more convenient way. In particular, now it is only necessary to either await the coroutine or call one of .then, .except or .finally to prevent a leak. It is no longer necessary to manually destroy the coroutine. Example: before:

async function runPythonAsync(code, globals) {
  let coroutine = Module.pyodide_py.eval_code_async(code, globals);
  try {
    return await coroutine;
  } finally {
    coroutine.destroy();
  }
}

After:

async function runPythonAsync(code, globals) {
  return await Module.pyodide_py.eval_code_async(code, globals);
}

#2030

pyodide-build#

  • API Change By default only a minimal set of packages is built. To build all packages set PYODIDE_PACKAGES='*' In addition, make minimal was removed, since it is now equivalent to make without extra arguments. #1801

  • Enhancement It is now possible to use pyodide-build buildall and pyodide-build buildpkg directly. #2063

  • Enhancement Added a --force-rebuild flag to buildall and buildpkg which rebuilds the package even if it looks like it doesn’t need to be rebuilt. Added a --continue flag which keeps the same source tree for the package and can continue from the middle of a build. #2069

  • Enhancement Changes to environment variables in the build script are now seen in the compile and post build scripts. #1706

  • Fix Fix usability issues with pyodide-build mkpkg CLI. #1828

  • Enhancement Better support for ccache when building Pyodide #1805

  • Fix Fix compile error wasm-ld: error: unknown argument: --sort-common and wasm-ld: error: unknown argument: --as-needed in ArchLinux. #1965

micropip#

  • Fix micropip now raises an error when installing a non-pure python wheel directly from a url. #1859

  • Enhancement micropip.install() now accepts a keep_going parameter. If set to True, micropip reports all identifiable dependencies that don’t have pure Python wheels, instead of failing after processing the first one. #1976

  • Enhancement Added a new API micropip.list() which returns the list of installed packages by micropip. #2012

Packages#

  • Enhancement Unit tests are now unvendored from Python packages and included in a separate package <package name>-tests. This results in a 20% size reduction on average for packages that vendor tests (e.g. numpy, pandas, scipy). #1832

  • Update Upgraded SciPy to 1.7.3. There are known issues with some SciPy components, the current status of the scipy test suite is here #2065

  • Fix The built-in pwd module of Python, which provides a Unix specific feature, is now unvendored. #1883

  • Fix pillow and imageio now correctly encode/decode grayscale and black-and-white JPEG images. #2028

  • Fix The numpy fft module now works correctly. #2028

  • New packages: logbook #1920, pyb2d #1968, and threadpoolctl (a dependency of scikit-learn) #2065

  • Upgraded packages: numpy (1.21.4) #1934, scikit-learn (1.0.2) #2065, scikit-image (0.19.1) #2005, msgpack (1.0.3) #2071, astropy (5.0.3) #2086, statsmodels (0.13.1) #2073, pillow (9.0.0) #2085. This list is not exhaustive, refer to packages.json for the full list.

Uncategorized#

  • Enhancement PyErr_CheckSignals now works with the keyboard interrupt system so that cooperative C extensions can be interrupted. Also, added the pyodide.checkInterrupt function so Javascript code can opt to be interrupted. #1294

  • Fix The _ variable is now set by the Pyodide repl just like it is set in the native Python repl. #1904

  • Enhancement pyodide-env and pyodide Docker images are now available from both the Docker Hub and from the Github Package registry. #1995

  • Fix The console now correctly handles it when an object’s __repr__ function raises an exception. #2021

  • Enhancement Removed the -s EMULATE_FUNCTION_POINTER_CASTS flag, yielding large benefits in speed, stack usage, and code size. #2019

List of contributors#

Alexey Ignatiev, Alex Hall, Bart Broere, Cyrille Bogaert, etienne, Grimmer, Grimmer Kang, Gyeongjae Choi, Hao Zhang, Hood Chatham, Ian Clester, Jan Max Meyer, LeoPsidom, Liumeo, Michael Christensen, Owen Ou, Roman Yurchak, Seungmin Kim, Sylvain, Thorsten Beier, Wei Ouyang, Will Lachance

Version 0.18.1#

September 16, 2021

Console#

  • Fix Ctrl+C handling in console now works correctly with multiline input. New behavior more closely approximates the behavior of the native Python console. #1790

  • Fix Fix the repr of Python objects (including lists and dicts) in console #1780

  • Fix The “long output truncated” message now appears on a separate line as intended. #1814

  • Fix The streams that are used to redirect stdin and stdout in the console now define isatty to return True. This fixes pytest. #1822

Python package#

  • Fix Avoid circular references when runsource raises SyntaxError #1758

JavaScript package#

Python / JavaScript type conversions#

  • Fix Conversion of very large strings from JavaScript to Python works again. #1806

  • Fix Fixed a use after free bug in the error handling code. #1816

Packages#

  • Fix pillow now correctly encodes/decodes RGB JPEG image format. #1818

Micellaneous#

  • Fix Patched emscripten to make the system calls to duplicate file descriptors closer to posix-compliant. In particular, this fixes the use of dup on pipes and temporary files, as needed by pytest. #1823

Version 0.18.0#

August 3rd, 2021

General#

  • Update Pyodide now runs Python 3.9.5. #1637

  • Enhancement Pyodide can experimentally be used in Node.js #1689

  • Enhancement Pyodide now directly exposes the Emscripten filesystem API, allowing for direct manipulation of the in-memory filesystem #1692

  • Enhancement Pyodide’s support of emscripten file systems is expanded from the default MEMFS to include IDBFS, NODEFS, PROXYFS, and WORKERFS, allowing for custom persistence strategies depending on execution environment #1596

  • API Change The packages.json schema for Pyodide was redesigned for better compatibility with conda. #1700

  • API Change run_docker no longer binds any port to the docker image by default. #1750

Standard library#

  • API Change The following standard library modules are now available as standalone packages

    • distlib

    They are loaded by default in loadPyodide, however this behavior can be disabled with the fullStdLib parameter set to false. All optional stdlib modules can then be loaded as needed with pyodide.loadPackage. #1543

  • Enhancement The standard library module audioop is now included, making the wave, sndhdr, aifc, and sunau modules usable. #1623

  • Enhancement Added support for ctypes. #1656

JavaScript package#

  • Enhancement The Pyodide JavaScript package is released to npm under npmjs.com/package/pyodide #1762

  • API Change loadPyodide no longer automatically stores the API into a global variable called pyodide. To get old behavior, say globalThis.pyodide = await loadPyodide({...}). #1597

  • Enhancement loadPyodide now accepts callback functions for stdin, stdout and stderr #1728

  • Enhancement Pyodide now ships with first party typescript types for the entire JavaScript API (though no typings are available for PyProxy fields). #1601

  • Enhancement It is now possible to import Comlink objects into Pyodide after using pyodide.registerComlink #1642

  • Enhancement If a Python error occurs in a reentrant runPython call, the error will be propagated into the outer runPython context as the original error type. This is particularly important if the error is a KeyboardInterrupt. #1447

Python package#

Python / JavaScript type conversions#

  • API Change pyodide.runPythonAsync no longer automatically calls pyodide.loadPackagesFromImports. #1538.

  • Enhancement Added the PyProxy.callKwargs method to allow using Python functions with keyword arguments from JavaScript. #1539

  • Enhancement Added the PyProxy.copy method. #1549 #1630

  • API Change Updated the method resolution order on PyProxy. Performing a lookup on a PyProxy will prefer to pick a method from the PyProxy api, if no such method is found, it will use getattr on the proxied object. Prefixing a name with $ forces getattr. For instance, PyProxy.destroy now always refers to the method that destroys the proxy, whereas PyProxy.$destroy refers to an attribute or method called destroy on the proxied object. #1604

  • API Change It is now possible to use Symbol keys with PyProxies. These Symbol keys put markers on the PyProxy that can be used by external code. They will not currently be copied by PyProxy.copy. #1696

  • Enhancement Memory management of PyProxy fields has been changed so that fields looked up on a PyProxy are “borrowed” and have their lifetime attached to the base PyProxy. This is intended to allow for more idiomatic usage. (See #1617.) #1636

  • API Change The depth argument to toJs is now passed as an option, so toJs(n) in v0.17 changed to toJs({depth : n}). Similarly, pyodide.toPy now takes depth as a named argument. Also to_js and to_py only take depth as a keyword argument. #1721

  • API Change PyProxy.toJs and to_js now take an option pyproxies, if a JavaScript Array is passed for this, then any proxies created during conversion will be placed into this array. This allows easy cleanup later. The create_pyproxies option can be used to disable creation of pyproxies during conversion (instead a ConversionError is raised). #1726

  • API Change toJs and to_js now take an option dict_converter which will be called on a JavaScript iterable of two-element Arrays as the final step of converting dictionaries. For instance, pass Object.fromEntries to convert to an object or Array.from to convert to an array of pairs. #1742

pyodide-build#

  • API Change pyodide-build is now an installable Python package, with an identically named CLI entrypoint that replaces bin/pyodide which is removed #1566

micropip#

  • Fix micropip now correctly handles packages that have mixed case names. (See #1614). #1615

  • Enhancement micropip now resolves dependencies correctly for old versions of packages (it used to always use the dependencies from the most recent version, see #1619 and #1745). micropip also will resolve dependencies for wheels loaded from custom urls. #1753

Packages#

  • Enhancement matplotlib now comes with a new renderer based on the html5 canvas element. #1579 It is optional and the current default backend is still the agg backend compiled to wasm.

  • Enhancement Updated a number of packages included in Pyodide.

List of contributors#

Albertas Gimbutas, Andreas Klostermann, Arfy Slowy, daoxian, Devin Neal, fuyutarow, Grimmer, Guido Zuidhof, Gyeongjae Choi, Hood Chatham, Ian Clester, Itay Dafna, Jeremy Tuloup, jmsmdy, LinasNas, Madhur Tandon, Michael Christensen, Nicholas Bollweg, Ondřej Staněk, Paul m. p. P, Piet Brömmel, Roman Yurchak, stefnotch, Syrus Akbary, Teon L Brooks, Waldir

Version 0.17.0#

April 21, 2021

See the Version 0.17.0 Release Notes for more information.

Improvements to package loading and dynamic linking#

  • Enhancement Uses the emscripten preload plugin system to preload .so files in packages

  • Enhancement Support for shared library packages. This is used for CLAPACK which makes scipy a lot smaller. #1236

  • Fix Pyodide and included packages can now be used with Safari v14+. Safari v13 has also been observed to work on some (but not all) devices.

Python / JS type conversions#

  • Feature A JsProxy of a JavaScript Promise or other awaitable object is now a Python awaitable. #880

  • API Change Instead of automatically converting Python lists and dicts into JavaScript, they are now wrapped in PyProxy. Added a new PyProxy.toJs API to request the conversion behavior that used to be implicit. #1167

  • API Change Added JsProxy.to_py API to convert a JavaScript object to Python. #1244

  • Feature Flexible jsimports: it now possible to add custom Python “packages” backed by JavaScript code, like the js package. The js package is now implemented using this system. #1146

  • Feature A PyProxy of a Python coroutine or awaitable is now an awaitable JavaScript object. Awaiting a coroutine will schedule it to run on the Python event loop using asyncio.ensure_future. #1170

  • Enhancement Made PyProxy of an iterable Python object an iterable Js object: defined the [Symbol.iterator] method, can be used like for(let x of proxy). Made a PyProxy of a Python iterator an iterator: proxy.next() is translated to next(it). Made a PyProxy of a Python generator into a JavaScript generator: proxy.next(val) is translated to gen.send(val). #1180

  • API Change Updated PyProxy so that if the wrapped Python object supports __getitem__ access, then the wrapper has get, set, has, and delete methods which do obj[key], obj[key] = val, key in obj and del obj[key] respectively. #1175

  • API Change The pyodide.pyimport function is deprecated in favor of using pyodide.globals.get('key'). #1367

  • API Change Added PyProxy.getBuffer API to allow direct access to Python buffers as JavaScript TypedArrays. #1215

  • API Change The innermost level of a buffer converted to JavaScript used to be a TypedArray if the buffer was contiguous and otherwise an Array. Now the innermost level will be a TypedArray unless the buffer format code is a ‘?’ in which case it will be an Array of booleans, or if the format code is a “s” in which case the innermost level will be converted to a string. #1376

  • Enhancement JavaScript BigInts are converted into Python int and Python ints larger than 2^53 are converted into BigInt. #1407

  • API Change Added pyodide.isPyProxy to test if an object is a PyProxy. #1456

  • Enhancement PyProxy and PyBuffer objects are now garbage collected if the browser supports FinalizationRegistry. #1306

  • Enhancement Automatic conversion of JavaScript functions to CPython calling conventions. #1051, #1080

  • Enhancement Automatic detection of fatal errors. In this case Pyodide will produce both a JavaScript and a Python stack trace with explicit instruction to open a bug report. pr{1151}, pr{1390}, pr{1478}.

  • Enhancement Systematic memory leak detection in the test suite and a large number of fixed to memory leaks. pr{1340}

  • Fix getattr and dir on JsProxy now report consistent results and include all names defined on the Python dictionary backing JsProxy. #1017

  • Fix JsProxy.__bool__ now produces more consistent results: both bool(window) and bool(zero-arg-callback) were False but now are True. Conversely, bool(empty_js_set) and bool(empty_js_map) were True but now are False. #1061

  • Fix When calling a JavaScript function from Python without keyword arguments, Pyodide no longer passes a PyProxy-wrapped NULL pointer as the last argument. #1033

  • Fix JsBoundMethod is now a subclass of JsProxy, which fixes nested attribute access and various other strange bugs. #1124

  • Fix JavaScript functions imported like from js import fetch no longer trigger “invalid invocation” errors (issue #461) and js.fetch("some_url") also works now (issue #768). #1126

  • Fix JavaScript bound method calls now work correctly with keyword arguments. #1138

  • Fix JavaScript constructor calls now work correctly with keyword arguments. #1433

pyodide-py package#

  • Feature Added a Python event loop to support asyncio by scheduling coroutines to run as jobs on the browser event loop. This event loop is available by default and automatically enabled by any relevant asyncio API, so for instance asyncio.ensure_future works without any configuration. #1158

  • API Change Removed as_nested_list API in favor of JsProxy.to_py. #1345

pyodide-js#

  • API Change Removed iodide-specific code in pyodide.js. This breaks compatibility with iodide. #878, #981

  • API Change Removed the pyodide.autocomplete API, use Jedi directly instead. #1066

  • API Change Removed pyodide.repr API. #1067

  • Fix If messageCallback and errorCallback are supplied to pyodide.loadPackage, pyodide.runPythonAsync and pyodide.loadPackagesFromImport, then the messages are no longer automatically logged to the console.

  • Feature runPythonAsync now runs the code with eval_code_async. In particular, it is possible to use top-level await inside of runPythonAsync.

  • eval_code now accepts separate globals and locals parameters. #1083

  • Added the pyodide.setInterruptBuffer API. This can be used to set a SharedArrayBuffer to be the keyboard interrupt buffer. If Pyodide is running on a webworker, the main thread can signal to the webworker that it should raise a KeyboardInterrupt by writing to the interrupt buffer. #1148 and #1173

  • Changed the loading method: added an async function loadPyodide to load Pyodide to use instead of languagePluginURL and languagePluginLoader. The change is currently backwards compatible, but the old approach is deprecated. #1363

  • runPythonAsync now accepts globals parameter. #1914

micropip#

  • Feature micropip now supports installing wheels from relative URLs. #872

  • API Change micropip.install now returns a Python Future instead of a JavaScript Promise. #1324

  • Fix micropip.install now interacts correctly with pyodide.loadPackage. #1457

  • Fix micropip.install now handles version constraints correctly even if there is a version of the package available from the Pyodide indexURL.

Build system#

  • Enhancement Updated to latest emscripten 2.0.13 with the upstream LLVM backend #1102

  • API Change Use upstream file_packager.py, and stop checking package abi versions. The PYODIDE_PACKAGE_ABI environment variable is no longer used, but is still set as some packages use it to detect whether it is being built for Pyodide. This usage is deprecated, and a new environment variable PYODIDE is introduced for this purpose.

    As part of the change, Module.checkABI is no longer present. #991

  • uglifyjs and lessc no longer need to be installed in the system during build #878.

  • Enhancement Reduce the size of the core Pyodide package #987.

  • Enhancement Optionally to disable docker port binding #1423.

  • Enhancement Run arbitrary command in docker #1424

  • Docker images for Pyodide are now accessible at pyodide/pyodide-env and pyodide/pyodide.

  • Enhancement Option to run docker in non-interactive mode #1641

REPL#

  • Fix In console.html: sync behavior, full stdout/stderr support, clean namespace, bigger font, correct result representation, clean traceback #1125 and #1141

  • Fix Switched from ̀Jedi to rlcompleter for completion in pyodide.console.InteractiveConsole and so in console.html. This fixes some completion issues (see #821 and #1160)

  • Enhancement Support top-level await in the console #1459

Packages#

  • six, jedi and parso are no longer vendored in the main Pyodide package, and need to be loaded explicitly #1010, #987.

  • Updated packages #1021, #1338, #1460.

  • Added Plotly version 4.14.3 and retrying dependency #1419

List of contributors#

(in alphabetic order)

Aditya Shankar, casatir, Dexter Chua, dmondev, Frederik Braun, Hood Chatham, Jan Max Meyer, Jeremy Tuloup, joemarshall, leafjolt, Michael Greminger, Mireille Raad, Ondřej Staněk, Paul m. p. P, rdb, Roman Yurchak, Rudolfs

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#

  • Modify 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 description 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.