Environment data

• VS Code version: 1.30.2
• Extension version (available under the Extensions sidebar): vscode-python 2018.12.1
• OS and version: ubuntu 16.04LTS
• Python version (& distribution if applicable, e.g. Anaconda): any pypy,cpython
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): pyenv
• Relevant/affected Python packages and their versions: None

Expected behaviour

When choosing python interpreter it lists all versions under ~/.pyenv correctly (see png below), but
the ones created with pyenv+virtualenv like pyenv virtualenv 3.7.2 mycoolapp which creates a venv environment under pyenv using python 3.7.2 with the name mycoolapp.
This should be activated with:
pyenv activate mycoolapp

The ones listed with venv VSC does:
$ source /home/mortenb/.pyenv/versions/mycoolapp/bin/activate

The ones listed with pyenv (the ones created with pyenv install 3.7.2, that downloads, compile and install the specified python version):
$pyenv shell 3.7.2
this works for base versions not for pyenv+virtualenv, but I recommend using pyenv activate for all

$ pyenv help activate
Usage: pyenv activate <virtualenv>
       pyenv activate --unset

Activate a Python virtualenv environment in current shell.
This acts almost as same as `pyenv shell`, but this invokes the `activate`
script in your shell.

<virtualenv> should be a string matching a Python version known to pyenv.

Example loading flask on python 3.6.2:

VSC does when opening a terminal:

$ source /home/mortenb/.pyenv/versions/flask/bin/activate
$ which python
/home/mortenb/.pyenv/shims/python
$ python --version
Python 3.7.0

It is wrong version, if it had done this it would have been correct:

$ pyenv activate flask
pyenv-virtualenv: prompt changing will be removed from future release. configure `export PYENV_VIRTUALENV_DISABLE_PROMPT=1' to simulate the behavior.
(flask) mortenb@mortenb-home1:/dist/sensio/unity-selenium$ which python
/home/mortenb/.pyenv/shims/python
(flask) mortenb@mortenb-home1:/dist/sensio/unity-selenium$ python --version
Python 3.6.2

Pyenv is a terrific technology, we manage full python versioning control within docker containers by a single build parameter. This container tagged with version number we use as base container for all python projects within the company, it makes regression testing and upgrading a oneliner in jenkins:

https://gist.github.com/fenchu/14b8fe5a0c24942f845a35106c7b176a

So please continue supporting it :-)

Thanks