pip doesn't see the latest versiions of packages

[yurivict]

Description

PyPI has prompt-toolkit-3.0.33 as the latest version.

But when I ask pip to update prompt-toolkit it says that the latest version is 3.0.19:

$ pip install --upgrade prompt-toolkit==3.0.33
ERROR: Could not find a version that satisfies the requirement prompt-toolkit==3.0.33 (from versions: 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 0.9, 0.10, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22, 0.23, 0.25, 0.26, 0.28, 0.30, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.40, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49, 0.50, 0.51, 0.52, 0.53, 0.54, 0.55, 0.56, 0.57, 0.58, 0.59, 0.60, 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5, 1.0.6, 1.0.7, 1.0.8, 1.0.9, 1.0.10, 1.0.13, 1.0.14, 1.0.15, 1.0.16, 1.0.17, 1.0.18, 2.0.1, 2.0.2, 2.0.3, 2.0.4, 2.0.5, 2.0.6, 2.0.7, 2.0.8, 2.0.9, 2.0.10, 3.0.0, 3.0.1, 3.0.2, 3.0.3, 3.0.4, 3.0.5, 3.0.6, 3.0.7, 3.0.8, 3.0.9, 3.0.10, 3.0.11, 3.0.12, 3.0.13, 3.0.14, 3.0.15, 3.0.16, 3.0.17, 3.0.18, 3.0.19)
ERROR: No matching distribution found for prompt-toolkit==3.0.33

Expected behavior

No response

pip version

21.3.1

Python version

3.6.1

OS

Linux xx 3.10.0-1160.31.1.el7.x86_64 (CentOS)

How to Reproduce

pip install --upgrade prompt-toolkit==3.0.33

Output

No response

Code of Conduct

• I agree to follow the PSF Code of Conduct.

[pfmoore]

Later versions have data-requires-python >= 3.6.2. You can see this by viewing the source of https://pypi.org/simple/prompt-toolkit/

The error message could certainly be better here.

[uranusjr]

Merging this as a duplicate of #7797.

[yurivict]

The error should explain that a particular set of versions can't be installed because they aren't compatible with the current Python version.

[uranusjr]

Feel free to raise a pull request.