prosemirror

library0.6.1pypypi✓ verified 90d ago

Python implementation of core ProseMirror modules for collaborative editing. Current version 0.6.1, requires Python >=3.10. Release cadence is irregular, with major upstream syncs every few months.

web-framework database

pip install prosemirror

github ↗package ↗changelog ↗

INSTALL

IMPORT

SIG · PROSEMIRROR

prosemirror

web-frameworkpythonv0.6.1

Install

2.5s avg

Import

174ms

Disk

30MB

Pass rate

10/ 10

Env Coverage10 / 10

glibc

3.9–3.13

musl

3.9–3.13

Install & Compatibility

Where this runs

tested against v0.6.1 · pip install

no network on importno background threads

Install × environment matrix

Each cell = how many times install + import succeeded across repeated harness runs. Partial = flaky.
glibc = Debian/Ubuntu slim · musl = Alpine Linux

musl

py 3.10–3.95 runs

installs and imports cleanly · install 0.0s · import 0.178s · 30.9MB

glibc

py 3.10–3.95 runs

installs and imports cleanly · install 2.5s · import 0.170s · 31MB

30MB installed

● package 30MB

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

Schema

✓ from prosemirror.model import Schema

✗ from prosemirror import Schema

Schema is in the model subpackage

DOMParser

✓ from prosemirror.model import DOMParser

Transform

✓ from prosemirror.transform import Transform

✗ from prosemirror import Transform

Transform is in the transform subpackage

Step

✓ from prosemirror.transform import Step

schema

✓ from prosemirror.schema_basic import schema

✗ from prosemirror import schema

The basic schema is in the schema_basic subpackage

Parse HTML into a ProseMirror document using the basic schema.

from prosemirror.model import Schema, DOMParser from prosemirror.schema_basic import schema # Create a document from HTML dom_parser = DOMParser.from_schema(schema) doc = dom_parser.parse('<p>Hello, world!</p>') print(doc.to_json()) # Output: {'type': 'doc', 'content': [{'type': 'paragraph', 'content': [{'type': 'text', 'text': 'Hello, world!'}]}]}

Debug

Known issues

gotchaPython string slicing uses Unicode codepoints, but ProseMirror positions are UTF-16 code units. This affects text_between and diff calculations. Always use UTF-16 aware functions when computing positions.

fix

Use the library's internal UTF-16 handling (no custom string slicing).

affects: >=0.6.0

breakingIn v0.5.0, `is_text_block` was renamed to `is_textblock` to match upstream. Old code using `is_text_block` will break.

fix

Replace `is_text_block` with `is_textblock`.

affects: >=0.5.0

breakingPython 3.9 and lower are no longer supported as of v0.5.0. Install may fail on older Python versions.

fix

Upgrade to Python 3.10+.

affects: >=0.5.0

gotchaImporting from `prosemirror` directly (e.g., `from prosemirror import Schema`) does not work. Use the full subpackage path.

fix

Import from subpackages like `prosemirror.model`.

affects: all

Errors

Common errors & fixes

ModuleNotFoundError: No module named 'prosemirror'

Package not installed or installed under a different name.

fix

Run `pip install prosemirror`.

ImportError: cannot import name 'Schema' from 'prosemirror'

Trying to import Schema from the top-level package instead of subpackage.

fix

Use `from prosemirror.model import Schema`.

KeyError: 'is_text_block'

Using old attribute name `is_text_block` which was renamed in v0.5.0.

fix

Use `is_textblock` instead.

Upgrade

Version history

0.6.1latest on PyPI · released Feb 21, 2026

Audit

Dependencies

No dependency data recorded yet.

Agent activity

7 hits · last 30 days

node

Anthropic

Resources

githubhttps://github.com/fellowapp/prosemirror-py ↗

packagehttps://pypi.org/project/prosemirror/ ↗

changeloghttps://github.com/fellowapp/prosemirror-py/releases ↗