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New ADR: Use PyEnv to set up multiple Python version on host #11

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New ADR: Use PyEnv to set up multiple Python version on host #11

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29 changes: 29 additions & 0 deletions docs/adr/XXXX-use-pyenv-to-set-up-multiple-python-version-on-host.md
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# Use PyEnv to set up multiple Python version on host

* Status: proposed
* Date: 2020-04-07

## Context and Problem Statement

It is common that multiple versions of Python need to be install on development
machines, which can be cumbersome.

## Decision Drivers <!-- optional -->

As a reminder, at time of writing, ODC only actively support linux, MacOS, and
POSIX unix systems.

## Considered Options
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Does Anaconda could also be on the list of considered options ?
Would be disqualified against pyenv as much more complex for this task only and some issues with transient dependencies (especially C++ ones) that make it less reliable.


* [PyEnv](https://github.com/pyenv/pyenv).
* [PipEnv](https://github.com/pypa/pipenv).
* Developing on virtual machine or docker containers.
* [altinstall](https://hackersandslackers.com/multiple-versions-python-ubuntu/)
on Ubuntu, and equivalent on other plateforms
* Install each version manually (through various means, be through package management
tools or by downloading and installing libraries).

## Decision Outcome

Chosen option: "PyEnv", because it allows to manage the full workflow of installing and
uninstalling Python versions.
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I think developing a little more why other options are not chosen.
In that way, pipenv or altinstall could also manage the install and uninstall of Python versions.