Pip installs stale version

[rubenhak]

Environment

• pip version: 18.0
• Python version: 2.7.15
• OS: Linux 4.9.93

Description
A package "berlioz=0.0.13" uploaded and shows up at pypi web ui (https://pypi.org/project/berlioz/). Though when installing package it installs version 0.0.10 instead of the latest version 0.0.13.

Expected behavior
The pip command was supposed to install the version 0.0.13

How to Reproduce
Run:

1. pip install berlioz

Output

Successfully built berlioz py-zipkin thriftpy
Installing collected packages: six, python-dateutil, jmespath, docutils, botocore, futures, s3transfer, boto3, chardet, urllib3, certifi, idna, requests, websocket-client, ply, thriftpy, py-zipkin, berlioz
Successfully installed berlioz-0.0.10 boto3-1.7.84 botocore-1.10.84 certifi-2018.8.13 chardet-3.0.4 docutils-0.14 futures-3.2.0 idna-2.7 jmespath-0.9.3 ply-3.11 py-zipkin-0.13.0 python-dateutil-2.7.3 requests-2.19.1 s3transfer-0.1.13 six-1.11.0 thriftpy-0.3.9 urllib3-1.23 websocket-client-0.51.0

[pradyunsg]

Could you try again? It might be a transient issue, due to pip caching the web page listing the releases for a package for 10 minutes.

[rubenhak]

It has been more than 24 hours. Few more details:

$ pip search berlioz
berlioz (0.1.2)  - Python SDK for Berlioz Cloud
  INSTALLED: 0.0.10
  LATEST:    0.1.2

$ pip install berlioz==0.1.2
Collecting berlioz==0.1.2
  Could not find a version that satisfies the requirement berlioz==0.1.2 (from versions: 0.0.4, 0.0.5, 0.0.6, 0.0.7, 0.0.8, 0.0.9, 0.0.10)
No matching distribution found for berlioz==0.1.2

[rubenhak]

Apparently the setup.py had contradicting python version rule which prevented pip to use the version.
Maybe pip can be improved to show more reasonable output to catch such issues easier.
The setup.py contained:

python_requires='>=2.7,>=3.6',

[pradyunsg]

Yeah. That's #5003.

[xavfernandez]

Closing in favor of #5003

[lock]

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