pip install package== does not work in pip >= 24.1.

[cederom]

Description

Pip >= 24.1 does not display available versions with pip install pip==.

I hope removing install == is a bug not by design because it breaks backward compatibility and lots of scripts. I avoid JavaScript because of its self-incompatibility.. and I am really sad to see this in Python world :-(

You can also note break in version parsing:

WARNING: Error parsing dependencies of bleach: Expected matching RIGHT_PARENTHESIS for LEFT_PARENTHESIS, after version specifier
    tinycss2 (>=1.1.0<1.2) ; extra == 'css'

Expected behavior

As in Pip version <=24.0:

(venv3.9embedded) pip install pip==
ERROR: Ignored the following yanked versions: 20.0, 20.3.2, 21.2
ERROR: Could not find a version that satisfies the requirement pip== (from versions: 0.2, 0.2.1, 0.3, 0.3.1, 0.4, 0.5, 0.5.1, 0.6, 0.6.1, 0.6.2, 0.6.3, 0.7, 0.7.1, 0.7.2, 0.8, 0.8.1, 0.8.2, 0.8.3, 1.0, 1.0.1, 1.0.2, 1.1, 1.2, 1.2.1, 1.3, 1.3.1, 1.4, 1.4.1, 1.5, 1.5.1, 1.5.2, 1.5.3, 1.5.4, 1.5.5, 1.5.6, 6.0, 6.0.1, 6.0.2, 6.0.3, 6.0.4, 6.0.5, 6.0.6, 6.0.7, 6.0.8, 6.1.0, 6.1.1, 7.0.0, 7.0.1, 7.0.2, 7.0.3, 7.1.0, 7.1.1, 7.1.2, 8.0.0, 8.0.1, 8.0.2, 8.0.3, 8.1.0, 8.1.1, 8.1.2, 9.0.0, 9.0.1, 9.0.2, 9.0.3, 10.0.0b1, 10.0.0b2, 10.0.0, 10.0.1, 18.0, 18.1, 19.0, 19.0.1, 19.0.2, 19.0.3, 19.1, 19.1.1, 19.2, 19.2.1, 19.2.2, 19.2.3, 19.3, 19.3.1, 20.0.1, 20.0.2, 20.1b1, 20.1, 20.1.1, 20.2b1, 20.2, 20.2.1, 20.2.2, 20.2.3, 20.2.4, 20.3b1, 20.3, 20.3.1, 20.3.3, 20.3.4, 21.0, 21.0.1, 21.1, 21.1.1, 21.1.2, 21.1.3, 21.2.1, 21.2.2, 21.2.3, 21.2.4, 21.3, 21.3.1, 22.0, 22.0.1, 22.0.2, 22.0.3, 22.0.4, 22.1b1, 22.1, 22.1.1, 22.1.2, 22.2, 22.2.1, 22.2.2, 22.3, 22.3.1, 23.0, 23.0.1, 23.1, 23.1.1, 23.1.2, 23.2, 23.2.1, 23.3, 23.3.1, 23.3.2, 24.0, 24.1b1, 24.1b2, 24.1, 24.1.1, 24.1.2, 24.2)
ERROR: No matching distribution found for pip==

[notice] A new release of pip is available: 24.0 -> 24.2
[notice] To update, run: pip install --upgrade pip

pip version

24.2

Python version

3.9.20

OS

FreeBSD

How to Reproduce

1. Update pip to version > 24.0.
2. Run pip install pip==.
3. See it does not display available versions anymore.

Output

Pip 24.2 does not display versions when == is appended to a package version:

(venv3.9embedded) pip --version
pip 24.2 from /XXX/.local/venv3.9embedded/lib/python3.9/site-packages/pip (python 3.9)

(venv3.9embedded) pip install pip==
ERROR: Invalid requirement: 'pip==': Expected end or semicolon (after name and no valid version specifier)
    pip==
       ^

Pip 24.1 has this problem too:

(venv3.9embedded) pip install pip==24.1
Collecting pip==24.1
  Using cached pip-24.1-py3-none-any.whl.metadata (3.6 kB)
Using cached pip-24.1-py3-none-any.whl (1.8 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 24.0
    Uninstalling pip-24.0:
      Successfully uninstalled pip-24.0
Successfully installed pip-24.1
(venv3.9embedded) pip install pip==
ERROR: Invalid requirement: 'pip==': Expected end or semicolon (after name and no valid version specifier)
    pip==
       ^

Pip 24.0 works fine:

(venv3.9embedded) pip install pip==24.0
Collecting pip==24.0
  Using cached pip-24.0-py3-none-any.whl.metadata (3.6 kB)
Using cached pip-24.0-py3-none-any.whl (2.1 MB)
WARNING: Error parsing dependencies of bleach: Expected matching RIGHT_PARENTHESIS for LEFT_PARENTHESIS, after version specifier
    tinycss2 (>=1.1.0<1.2) ; extra == 'css'
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 24.1
    Uninstalling pip-24.1:
      Successfully uninstalled pip-24.1
Successfully installed pip-24.0

Quick workaround:

(venv3.9embedded) pip index versions pip
WARNING: pip index is currently an experimental command. It may be removed/changed in a future release without prior warning.
pip (24.2)
Available versions: 24.2, 24.1.2, 24.1.1, 24.1, 24.0, 23.3.2, 23.3.1, 23.3, 23.2.1, 23.2, 23.1.2, 23.1.1, 23.1, 23.0.1, 23.0, 22.3.1, 22.3, 22.2.2, 22.2.1, 22.2, 22.1.2, 22.1.1, 22.1, 22.0.4, 22.0.3, 22.0.2, 22.0.1, 22.0, 21.3.1, 21.3, 21.2.4, 21.2.3, 21.2.2, 21.2.1, 21.1.3, 21.1.2, 21.1.1, 21.1, 21.0.1, 21.0, 20.3.4, 20.3.3, 20.3.1, 20.3, 20.2.4, 20.2.3, 20.2.2, 20.2.1, 20.2, 20.1.1, 20.1, 20.0.2, 20.0.1, 19.3.1, 19.3, 19.2.3, 19.2.2, 19.2.1, 19.2, 19.1.1, 19.1, 19.0.3, 19.0.2, 19.0.1, 19.0, 18.1, 18.0, 10.0.1, 10.0.0, 9.0.3, 9.0.2, 9.0.1, 9.0.0, 8.1.2, 8.1.1, 8.1.0, 8.0.3, 8.0.2, 8.0.1, 8.0.0, 7.1.2, 7.1.1, 7.1.0, 7.0.3, 7.0.2, 7.0.1, 7.0.0, 6.1.1, 6.1.0, 6.0.8, 6.0.7, 6.0.6, 6.0.5, 6.0.4, 6.0.3, 6.0.2, 6.0.1, 6.0, 1.5.6, 1.5.5, 1.5.4, 1.5.3, 1.5.2, 1.5.1, 1.5, 1.4.1, 1.4, 1.3.1, 1.3, 1.2.1, 1.2, 1.1, 1.0.2, 1.0.1, 1.0, 0.8.3, 0.8.2, 0.8.1, 0.8, 0.7.2, 0.7.1, 0.7, 0.6.3, 0.6.2, 0.6.1, 0.6, 0.5.1, 0.5, 0.4, 0.3.1, 0.3, 0.2.1, 0.2
  INSTALLED: 24.2
  LATEST:    24.2

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[notatallshaw]

Thanks for reporting but it is a duplicate of this issue: #12852

Please check the workarounds provided here: #12852 (comment)

I hope removing install == is a bug not by design because it breaks backward compatibility and lots of scripts. I avoid JavaScript because of its self-incompatibility.. and I am really sad to see this in Python world :-(

Unfortunately, the specific output of this error message was never a feature that pip supported.