CHE-3120: Add Sourcegraph Python Language Server to Che

[vparfonov]

What does this PR do?

Add Sourcegraph Python Language Server to Che

What issues does this PR fix or reference?

#3120

[codenvy-ci]

Build # 1603 - FAILED

Please check console output at https://ci.codenvycorp.com/job/che-pullrequests-build/1603/ to view the results.

[vparfonov]

[vparfonov]

ci-build

[codenvy-ci]

Build success. https://ci.codenvycorp.com/job/che-pullrequests-build/1610/

[bmicklea]

@vparfonov - I'm trying to write the release notes for this but I can't find any intellisense for Python in codenvy.io, even after I turn on the language server with our Python stack and sample app. What are the types of intellisense that this adds for Python and how is it triggered?

[vparfonov]

@bmicklea Current version of Sourcegraph Python Language Server doesn't provide any intellisense in classic means. For now it's support only hover feature https://github.com/Microsoft/language-server-protocol/blob/master/protocol.md#hover-request

[bmicklea]

Okay, for some reason the hover didn't work for me either (I saw it in your video). Thanks for clarifying.

[ymatagne]

Hello,
Nice Job. This is very interesting for python 3.6.

But, i've the impression that python language server doesn't work with python 2.7 ?

Thanks,

[bmicklea]

@ymatagne the Sourcegraph Python LS that we're using says that it works for Python 3.x and 2.x. Is something not working for you?

[ymatagne]

@bmicklea Yes, Python Ls don't work with Python 2.X.

If you want reproduce:

1. Select Python 2.7 stack in stack view
2. Active Sourcegraph Python LS
3. Click to Test button

When workspace is open, you cannot create project or update project. In log file, there isn't error.

I try with Mac and Windows with Che 5.2.2.

Thanks,