Python Intellisense very slow

[jajcayn]

Environment data

• VS Code version: 1.23.1
• Extension version (available under the Extensions sidebar): 2018.4.0
• OS and version: Mac Os 10.13.4
• Python version (& distribution if applicable, e.g. Anaconda): python3.6.5 [homebrew]
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): virtualenv
• Relevant/affected Python packages and their versions: all, but testing with pandas

Actual behavior

intellisense and autocomplete very slow, at first it works but after a couple of minutes stops working. Developer tools throwing an error [see below]

Expected behavior

I guess intellisense should work, ideally immediately

Steps to reproduce:

1. XXX

Logs

nothing interesting here, only pylint results

XXX

Output from Console under the Developer Tools panel (toggle Developer Tools on under Help)

[jajcayn]

I just found out, that when I start Code, as an interpreter I have a default Python 2.7.15.. [I have both installed]. In that case everything works just fine.
When I change interpreter to Python 3.6.5 (virtualenv), the intellisense breaks down and stops working. By changing the interpreter, a line with python.pythonPath pointing to the correct python binary inside a virtualenv is added to my workspace settings, but I guess this is expected behavior.

In any case, Intellisense stops working when I change python interpreter, is this expected?

[DonJayamanne]

but I guess this is expected behavior.

Yes this is the right behavior.

Please could you open a new workspace folder and create a new python file and type the following to see if intellisense works (for sys and os modules):

import sys
import os

print(sys.executable)
print(os.getenv("ONE", "Not Found"))

[Arkowen]

i have same promble but worse than you and there is a same promble https://github.com/Microsoft/vscode/issues/50818

Open a Python file in the editor with the Python extension enabled.
Begin typing an identifier
Press tab,
expected result: autocompletion suggestions
actual result: tab inserted
Resume typing an identifier
Press Ctrl-Space
expected result: autocompletion suggestions
actual result: suggestion context menu pops open, stays on "Loading" arbitrarily long

If I disable the Python extension and try the above, I get suggestions as expected, but no Python-aware suggestions (parameter values, keywords, etc.)

[jajcayn]

Thanks for the response.

When creating new file inside different workspace, the intellisense works for both default interpreter (Python 2.7.15) and also when I select Python 3.6.5 (virtualenv)

is it possible that intellisense breaks down when working in a large workspace? (n.b. the workspace I usually work with is approx 3GB large, with tons of python scripts and on git, hence all the git interactions are running).. on the other hand, it is indeed weird that everything works as expected when using default Python 2.7.15 interpreter, but not with Python 3.6.5 (virtualenv) one.

[brettcannon]

@jajcayn yes, it's very possible intellisense starts to fall over with that amount of source code.

[jajcayn]

@brettcannon thanks for the response. I thought that with repository this large, the intellisense would be slower, but still, I am getting an error in Developer console described above (TypeError) so something is not right...
I would be perfectly OK if the intellisense would be a bit slower (but worked..) on huge projects

[DonJayamanne]

@jajcayn
Is there any chance you can share the repository or a similar repo we could use to replicate this issue at our end.

[jajcayn]

@DonJayamanne
sorry, no chance - that is a private repository of the company I work in

[no-response]

This issue has been automatically closed because there has been no response to our request for more information from the original author. With only the information that is currently in the issue, we don't have enough information to take action. Please reach out if you have or find the answers we need so that we can investigate further.

[brettcannon]

@jajcayn if you want you can try our in-development language server by setting "python.jediEnabled": false and then restart VS Code when prompted. That will download the language server and start its execution. It's still under active development so I can't make any promises about its accuracy, but it should be faster.