如何在Unbuntu 16.04上安装python3.6（dev）而不与python3.5（dev）冲突

Question

I have an app that must be run on python3.6 and I'd prefer to run it on a Unbuntu 16.04 OS. Problem is that eventually python3.6 ends up trolling through /usr/lib/python3 which is already polluted with python3.5 libraries.

I've tried uninstalling python3.5 but packages like cython3 keep pulling it back in. I've looked at pyenv as well as update-alternatives , but I'm not convinced they sanitize the /usr/lib and /usr/include . I'm still seeing python3.6-dev and python3.5-dev conflicts.

Specific repos I'm trying to work on:

• https://github.com/spesmilo/electrum
• https://github.com/trezor/python-trezor

Answer 1

@tripleee was right, virtualenv fixed the problem, but there were quite few bumps along the way. Here's what I did:

1. Uninstalled cython3: ( apt-get remove cython3 )
2. Installed Py3.6 and dev: ( apt-get install python3.6 python3.6-dev )
3. Installed VirtualEnv: ( python3.6 -m pip install virtualenv )
4. Launched VirtualEnv: ( source $HOME/python3.6/bin/activate )
5. Built and installed sip-4.19.13 and PyQt5_gpl-5.11.3 from source.
6. Installed python-trezor and electrum from source.
7. Launched electrum from VirtualEnv

Most of my problems were related to python3-* distribution packages, and the fact that wheels for 32bit linux are getting more and more rare. This is what predicated the need for me to build PyQt5 and sip . I had them in a distribution package, but those packages always landed into the 3.5 tree, since 3.6 isn't officially supported on Ubuntu 16.04 LTS yet.

I've included the ubuntu16-electrum-git-build.sh script if anyone is interested.