Pip 20 no longer finds latest version of cmake

[bluenote10]

Environment

• pip version: 20.0.1
• Python version: 3.7.6 (but same with 2.7.12)
• OS: Ubuntu 16.04

Description

pip install "cmake==3.15.3" no longer finds a matching distribution although this version exists on PyPI.

Expected behavior

Should find the latest version.

How to Reproduce

$ virtualenv -p /usr/bin/python3.7 /tmp/venv3.7
$ . /tmp/venv3.7/bin/activate
$ pip install -U pip
Requirement already up-to-date: pip in /tmp/venv3.7/lib/python3.7/site-packages (20.0.1)
$ pip install "cmake==3.15.3"
ERROR: Could not find a version that satisfies the requirement cmake==3.15.3 (from versions: 0.1.0, 0.2.0, 0.4.0, 0.5.0, 0.6.0, 0.7.0, 0.7.1, 0.8.0, 0.9.0, 3.6.3, 3.6.3.post1, 3.7.2, 3.8.2, 3.9.6, 3.10.3, 3.11.0, 3.11.4, 3.11.4.post1, 3.12.0, 3.13.0, 3.13.1, 3.13.2, 3.13.2.post1, 3.13.3)
ERROR: No matching distribution found for cmake==3.15.3

Version 19 has no problem finding cmake:

$ pip install "pip<20"
Collecting pip<20
  Using cached pip-19.3.1-py2.py3-none-any.whl (1.4 MB)
Installing collected packages: pip
  Attempting uninstall: pip
    Found existing installation: pip 20.0.1
    Uninstalling pip-20.0.1:
      Successfully uninstalled pip-20.0.1
Successfully installed pip-19.3.1
$ pip install "cmake==3.15.3"
Collecting cmake==3.15.3
  Using cached https://files.pythonhosted.org/packages/ff/34/0a311fedffcc7a153bbc0390ef4c378dbc7f09f9865247137f82d62f8e7a/cmake-3.15.3-py3-none-manylinux2010_x86_64.whl
Installing collected packages: cmake
Successfully installed cmake-3.15.3
WARNING: You are using pip version 19.3.1; however, version 20.0.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

[sbidoul]

This looks like a variant of #7626: the cmake wheels have similar compatibility tags

[pradyunsg]

I'm gonna close this in favor of #7626. Thanks for filing a detailed issue -- much appreciated! :)