• Update to the latest MicroPython (#2454 and pyscript/polyscript#172):
  • weakref support
  • Template strings
  • Complete asyncio.Future support.
  • 4 variants of the wasm build: micropython.wasm (standard), micropython-settrace.wasm (for debugging), micropython-ulab.wasm (ulab = numpy-like API) and micropython-settrace-ulab.wasm (everything).
• Minor consistency fix in pyscript.web API (#2455 - thanks @iliketocode2)

• Removed warnings about window and document when sync_main_only config property is true: #2434
• Improved errors on bootstrap when the config cannot be parsed or contains errors: #2435
• Updated Pyodide to its 0.29.3 version: https://pyodide.org/en/stable/project/changelog.html
• Improved packages resolution by ignoring case-sensitive names: pyscript/polyscript#168
• Removed the legacy, archived, toml-j0.4 parser #2442 in favor of our own improved basic-toml parser pyscript/polyscript#171
• Improved pyscript.web API where el.append("string") will now work as expected: #2447 Thanks to new contributor @iliketocode2.
• Docstring fixes so Markdown API docs render properly: #2449
• Ensure the remove method for CSS classes is more forgiving (it logs a warning rather than throws an exception if the class to be removed does not exist): #2450
• Documentation updates given feedback by users: pyscript/docs#209 pyscript/docs#210 (thanks for the suggestion @clayote).

• Minor fixes in coincident.
• Removed WebR (for the time being) and improved packages details in polyscript.
• Updated polyscript module to include latest coincident and latest Pyodide 0.29.1.
• INCLUDES BREAKING CHANGES API/docstring refactor #2414
  • magic_js renamed to context (but everything should still only be referenced via the core pyscript namespace).
  • A much requested change in pyscript.web: use page["#an-id"] to get a single element by id (rather than page.find("#an-id")[0]).
  • In pyscript.web an Element's styles are a Python dict and classes a Python set (rather than custom objects with a similar API to those Python classes).
  • Explicitly use update_all with ElementCollection instances. You used to be able to do implicit changes via: my_collection.innerHTML = "foo". Feedback was this felt risky (folks thought they were mutating an element, not an element collection and they were getting strange results). Now you just: my_collection.update_all(innerHTML="foo") which also makes it more obvious what's going on.
  • Extensive rewrite of docstrings with examples. These form the basis of our new API docs.
  • Added many more tests for the purpose of coverage and testing edge-cases.

• Include a new unstuck feature for dealing with web workers stuck in an unresponsive loop (see the docs for more information).
• A new offline.zip file is added to each release. This is an archive of an offline-first version of PyScript.

Full Changelog: 2025.11.1...2025.11.2

• PyScript does not throw errors anymore if a package is not available in the official Pyodide packages "graph". See this PR for more details.
• PyScript allows passing File and Blob instances to any worker from the main thread, through worker related Python code. See this change for the underlying technical details.

Full Changelog: 2025.10.3...2025.11.1

After a Chromium update we have noticed our pyscript.fs broke so that:

• a bug has been filed to inform Chromium about the regression or breaking change: https://issues.chromium.org/issues/454531070
• investigation occurred and code has been updated to use the pattern that doesn't throw cryptic errors anymore
• extensive tests both on Pyodide and MicroPython, main thread and workers, has been manually done to be sure all expectations are met

From users' perspective, the modal about granting access might happen twice now:

• the first time lasts the whole session or until you close your browser
• the next time you get a chance to allow that access always, as opposite of once
• if you accept always that dialog will never bother you again unless you clear the whole browser cache

More details in #2395.

• Fixed remote packages issue found after real-world use case example. See: #2393

• Added a transform ability from main to worker, not just worker to main: pyscript/polyscript#148
• Added experimental_remote_packages config flag for remote packages: pyscript/polyscript@f086129
• Augmented Pyodide bootstrap with pre-fetched packages details to improve feedback on incompatible packages when bootstrapping PyScript: pyscript/polyscript@c879c6e
• Simplified the @pyscript/bridge to bring in automatically PyScript if not already on the page: #2379
• Fixed PyEditor issue on Ctrl+Enter (now working): #2385
• Improved pyscript.web after MicroPython updates: #2387
• We now allow you to define a custom TOML parser for more complex configs: #2390
• First steps (of a work in progress) to validate Pyodide package availability and metadata: #2392
• Updated MicroPython to version 1.27.0-preview-283:
  • Fixed proxies references
  • Improved interoperability with JS
  • Added inspect.signature for callables / generators / others
• Update Pyodide to version 0.29.0:
  • py-game-ce is back!
  • Default conversion of to_js as JS object literal, not map
  • Fixed a Wasm GC reference leak on invokes
  • New features / enhancements here: https://pyodide.org/en/stable/project/changelog.html#version-0-29-0

IMPORTANT - this release of PyScript uses a new version of Pyodide that has different behaviour relating to the handling of null / None. THIS MAY BREAK YOUR CODE. Read the notes (especially regarding the pyscript.ffi.is_none feature), to understand how PyScript supports you in this transition.

• All fetch operations now produce readable error messages when these happen: pyscript/polyscript#146
• PyScript's package caching mechanism is now based on latest Pyodide lockFileContents: pyscript/polyscript#144
• Update MicroPython to its preview-386 version: pyscript/polyscript#143
• Update Pyodide to its 0.28.1 version: https://pyodide.org/en/stable/project/changelog.html#version-0-28-1 and added pyscript.ffi.is_none(renference) to ease-out the null VS None distinction.
• Add an explicit pyscript.fs.remove(path) option to both unmount that path and erase its content from the database: #2368
• Change pyscript.WebSockets default to arrayBuffer to retrieve directly memory views: #2366
• Still on WebSockets, asynchronous listeners are now supported: #2366
• PyWorker args are now more user friendly: #2366

The most relevant Pyodide changes (more Pyodide context here):

• There is a new pyodide.ffi.jsnull reference which is the default type for JavaScrpt null: goodbye null to None implicit conversion, we are providing a pyscript.ffi.is_none(reference) to ease-out this distinction that works regardless of the runtime.
• If jsobj is a JavaScript proxy for a Python dict then jsobj[name] and jsobj.name now works seamlessly, allowing a JS object representing a Python dict to be used in way more scenarios than before. For more information, see the Pyodide docs.

Release notes

• This release is exclusively worker related:
  • ImageData now travels directly from main to workers to allow .data manipulation and related context.putImageData(ref) operations: WebReflection/reflected-ffi#8
  • a non breaking error about Promise unable to travel, due structured clone algorhitm incompatibility, happening when asynchronous handlers are attached to main references, has been fixed: WebReflection/reflected-ffi@663a3e5
  • when PyEditor or MpyEditor have multiple related env and/or a setup node, the logic now stops properly all scripts if one of their execution gets somehow stuck, bootstrapping again setup nodes when present to fully reset the environment and start keeping latest typed code: #2361
  • MicroPython workaround for Symbol properties accessed directly via the get trap when common JS operations are performed on Python proxied objects: see bug micropython/micropython#17657