msgpack-python
MessagePack (de)serializer.
Decision gist · record as of 2026-08-14
No. Do not install msgpack-python. The package is deprecated, abandoned, and explicitly directs users to install msgpack instead. Use msgpack for any new or existing projects that need MessagePack serialization.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Package is deprecated; use msgpack instead.
- Requires Python 2.7 or 3.5+ based on classifiers, but no longer maintained.
- High install friction and abandoned maintenance status.
License · maintenance · safety
Apache 2.0 (permissive) — Licensed under Apache 2.0 (permissive), which poses no legal barrier, but the deprecation status makes the license terms moot for new projects.
last release 2018-03-10 (3079 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,293,583 downloads/mo, #4,098 on PyPI
Alternatives
Verify before relying
# Do not use this package. Install msgpack instead.
# If you must use the deprecated msgpack-python:
# pip install msgpack-python==0.5.6
import msgpack- Whether msgpack is a drop-in substitute or requires code changes.
- Current state of downstream projects still depending on msgpack-python and their migration status.
What it is and what it does
msgpack-python is a deprecated binary serialization library that once provided MessagePack encoding and decoding for Python. It was last released on 2018-03-10 and has been abandoned since then. The package itself directs all users to install msgpack instead, which is the actively maintained successor.
Do not install this package for new projects. If you encounter it as a transitive dependency, update your dependency tree to use msgpack directly. The high install friction combined with complete abandonment makes this package unsuitable for any current use.
Use it for
- Maintaining legacy code that explicitly requires msgpack-python==0.5.6 and cannot be updated (not recommended).
- Understanding historical Python serialization libraries, but only for educational purposes.
- Migrating away from msgpack-python to msgpack as part of a deprecation cleanup.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
No.
Do not install msgpack-python. The package is deprecated, abandoned, and explicitly directs users to install msgpack instead. Use msgpack for any new or existing projects that need MessagePack serialization.
Install
msgpack-python on PyPI
Before you install
High install friction and abandoned maintenance status. Last release was 2018-03-10, many years ago. The package itself declares deprecation in its description and directs users to install msgpack instead.
Package is deprecated; use msgpack instead. Requires Python 2.7 or 3.5+ based on classifiers, but no longer maintained.
License in practice
Licensed under Apache 2.0 (permissive), which poses no legal barrier, but the deprecation status makes the license terms moot for new projects.
Quickstart
# Do not use this package. Install msgpack instead.
# If you must use the deprecated msgpack-python:
# pip install msgpack-python==0.5.6
import msgpackVerify before relying
- Whether msgpack is a drop-in substitute or requires code changes.
- Current state of downstream projects still depending on msgpack-python and their migration status.
Package facts
| License | Apache 2.0 permissive |
| Python support | Not specified |
| Install friction | High. Source build required |
| Runtime dependencies | None |
| Maintenance | Abandoned 3,079 days since the last release |
| First released | |
| Downloads | 1,293,583 / month, #4,098 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Intended Audience :: DevelopersLicense :: OSI Approved :: Apache Software LicenseProgramming Language :: Python :: 2Programming Language :: Python :: 2.7Programming Language :: Python :: 3Programming Language :: Python :: 3.5Programming Language :: Python :: 3.6Programming Language :: Python :: 3.7Programming Language :: Python :: Implementation :: CPythonProgramming Language :: Python :: Implementation :: PyPy |
Evidence: msgpack-python-0.5.6.tar.gz
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