PyPi repository for 4.21.0 doesn't specify required Python version

[codrin-lanterne]

Because the 4.21.0 release of protobuf on PyPi (https://pypi.org/project/protobuf/4.21.0) doesn't specify the required Python version, this leads to the installation of the library via pip install protobuf to fail when using Python versions smaller than 3.7 (leading to protobuf requires Python '>=3.7' but the running Python is 3.6.9 for example). This also leads to other libraries such as ortools to fail installation.

How to replicate (the commands were ran from an Ubuntu 18.04.5 LTS machine):

1. python3.6 -m venv venv
2. . venv/bin/activate
3. pip install protobuf

[majorgreys]

The metadata on the 4.21 wheels are missing Requires-Python:

# cat protobuf-4.21.0.dist-info/METADATA
Metadata-Version: 2.1
Name: protobuf
Version: 4.21.0

UNKNOWN

This is not expected given that it appears in the setup.py:

protobuf/python/setup.py

Line 357 in 7062d0a

python_requires='>=3.7',

By contrast, this is the contents of wheel for 3.19.4:

# cat protobuf-3.19.4.dist-info/METADATA
Metadata-Version: 2.1
Name: protobuf
Version: 3.19.4
Summary: Protocol Buffers
Home-page: https://developers.google.com/protocol-buffers/
Maintainer: protobuf@googlegroups.com
Maintainer-email: protobuf@googlegroups.com
License: 3-Clause BSD License
Download-URL: https://github.com/protocolbuffers/protobuf/releases
Platform: UNKNOWN
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.5
Classifier: Programming Language :: Python :: 3.6
Classifier: Programming Language :: Python :: 3.7
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Requires-Python: >=3.5
License-File: LICENSE

Protocol Buffers are Google's data interchange format

[zhangskz]

Fixed in protocolbuffers/upb@ef78b6a

[hemanth-vamper]

Is this fixed? I still see the dependency issue (python >= 3.7)

[zhangskz]

Not quite -- the fix is submitted to the upb repo and PR #10058 will update 21.x release branch to point to the updated upb repo commit.

This will probably end up in a 21.1 patch release.

[hemanth-vamper]

Thanks @zhangskz
Do you know the time line for 21.1 patch release?

[perezd]

Planning for tomorrow EOD.

[nthostrup]

Issue persists. Presumably due to a requirement in protobuff for a specific python version.
Workaround is to specifically list protobuf<4.21.0 in requirements.txt file.