[issue26119] Windows Installer can sometimes silently fail pip stage

[Paul Hammant]

New submission from Paul Hammant:

It NEEDS to communicate more as to why it is rolling back the pip install (progress bar goes backwards, install fails).

Reasons can be:

1. older/wrong versions of Python listed in the PATH - eg c:\Python27 encountered when c:\Python34 is being installed. User should redo PATH env-var.

2. PYTHONPATH similarly set to the wrong thing. User should delete PYTHONPATH env-vars.

3. Incompatible Python installed. User should uninstall other Python's first.

The windows install does not have to silently fail on the pip piece. It can do more to inform them end-user, and not drive them off to stackoverflow.

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components: Windows
messages: 258266
nosy: Paul Hammant, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Windows Installer can sometimes silently fail pip stage
versions: Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26119>
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