Environment data

• VS Code version: 1.30.2
• Extension version (available under the Extensions sidebar): 2018.12.0
• OS and version: Linux kn-workstation 4.20.3-arch1-1-ARCH 1228 multi root master #1 SMP PREEMPT Wed Jan 16 22:38:58 UTC 2019 x86_64 GNU/Linux
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.2
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): venv
• Relevant/affected Python packages and their versions: none

Expected behaviour

Formatting of python documents does not work anymore, since version 2018.12.1, instead it shows There is no document formatter for 'python'-files installed. I tried autopep8, yapf and black, all installed in the virtual environment.

Actual behaviour

Downgrading to 2018.12.0 fixes the issue.

Steps to reproduce:

1. Upgrade to 2018.12.1 and try to format a Python file.

Logs

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

Starting Jedi Python language engine.
##########Linting Output - pylint##########
##########Linting Output - pylint##########

--------------------------------------------------------------------
Your code has been rated at 10.00/10 (previous run: 10.00/10, +0.00)

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help; turn on source maps to make any tracebacks be useful by running Enable source map support for extension debugging)

None