Install fails for package with epoch version following PEP-427

[wenkokke]

Description

See python-poetry/poetry#6466.

Using a package with an epoch version, e.g., "1!1.0.0", building the package with poetry creates a wheel with the filename containing "1_1.0.0", replacing the ! with a _ following PEP-427.

However, pip expects the wheel to have a version name containing "1!1.0.0", and fails with message "ERROR: Could not build wheels for , which is required to install pyproject.toml-based projects".

Expected behavior

I'd expect pip to follow PEP-427 and accept a wheel containing "1_1.0.0" instead of "1!1.0.0".

pip version

22.2.2

Python version

3.9.13

OS

macOS 11

How to Reproduce

1. Create a poetry package with a non-zero epoch, e.g., 1!1.0.0.
2. Install the package with pip install ..

Output

No response

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[uranusjr]

The rule you referenced from PEP 427 is outdated. The most up-to-date and canonical specification of wheel file names (among other things) can be found on packaging.python.org:

Version numbers should be normalised according to PEP 440. Normalised version numbers cannot contain -.

A wheel builder should retain the ! character, and Poetry’s current implementation is incorrect.