Language Server does not work with PYTHONPATH=./

[DonJayamanne]

@DonJayamanne commented on Sun Mar 31 2019

• Open the behave repo
• Use python 3.7
• OS Mac
• Enable the following in settings.json

	"python.analysis.downloadChannel": "daily",
	"python.analysis.logLevel": "Trace",

• Add a .env file with the following contents:

PYTHONPATH=./

Delete the above .env file then it works

None of the Language Server functionality works

[vivlim]

I encountered this with a project that had two adjacent delimiters in PYTHONPATH, i.e. PYTHONPATH=::.
There was no clear way to tell what was happening, all I could observe was that I had a cpu core pinned by the language server & no completions were working. That core continues to be 100% utilized until the vscode window closes. I've observed it running for at least 20 minutes of cpu time, though it's probably run for longer.

(I ended up having adjacent delimiters because I was trying have a single PYTHONPATH that would work across windows & linux which both use different os.pathsep.)

[jakebailey]

@vivlim Did you also encounter this on Mac/Linux?

[vivlimmsft]

@jakebailey yes, I saw this on an Ubuntu 18.04 machine

[jakebailey]

This should be fixed in 0.2.56+, if you'd like to retest.

[vivlimmsft]

Sure, I'll try it tonight. Thanks!!

[vivlim]

@jakebailey On 0.2.58.0, the language server no longer pins a cpu core at 100% when PYTHONPATH=::, which is better, but it still seems to be stuck initializing. I do not get any completions or any analysis status in the status bar.

Starting Microsoft Python language server.

Linter 'pep8' is not installed. Please install it or select another linter".
Error: Module 'pep8' not installed.

Linter 'pylint' is not installed. Please install it or select another linter".
Error: Module 'pylint' not installed.
[Info  - 6:20:32 p.m.] GetCurrentSearchPaths /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/bin/python 
[Info  - 6:20:32 p.m.] Python search paths:
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/lib/python3.6
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/lib/python3.6/lib-dynload
[Info  - 6:20:32 p.m.]     /usr/lib/python3.6
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/lib/python3.6/site-packages
[Info  - 6:20:32 p.m.] Configuration search paths:
[Info  - 6:20:32 p.m.]     /home/vivlim
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/lib/python36.zip
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/lib/python3.6
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/lib/python3.6/lib-dynload
[Info  - 6:20:32 p.m.]     /usr/lib/python3.6
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/lib/python3.6/site-packages
[Info  - 6:20:32 p.m.]     /home/vivlim/.local/share/virtualenvs/py-test-wKGYf3-f/bin
<no output below this line, including the LS version number.>

If I comment out the line in .env that sets PYTHONPATH, it can initialize normally and I get completions.

[jakebailey]

Can you show what the output for "configuration search paths" is with and without that variable set? Your home directory probably shouldn't be showing up there.