"Python extension loading..." message last forever

[PROFeNoM]

Environment data

• VS Code version: x64-1.30.2
• Extension version (available under the Extensions sidebar): 2018.12.1
• OS and version: Windows 10
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.7
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): N/A

Expected behaviour

The "Python extension loading..." message at the bottom should disappear and the extension should be usable

Actual behaviour

The message last forever and the extension isn't usable

Steps to reproduce:

1. Install the Python extension
   NB : Also happens when launch as an administrator; after re-installing extension/vscode

Logs

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

N/A - No output

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)

[ms-python.python]: Command `python.datascience.exportoutputasnotebook` appears multiple times in the `commands` section.
extensionHost.ts:329 [Extension Host] debugger listening on port 8949
log.ts:157  INFO no standard startup: not a new window
extensionHost.ts:235 Extension Host
extensionHost.ts:236 Debugger listening on ws://127.0.0.1:8949/244405a2-1785-4902-bede-aca2f889a5da
For help see https://nodejs.org/en/docs/inspector

console.ts:134 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
console.ts:134 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
console.ts:134 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
console.ts:134 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
console.ts:134 [Extension Host] Python Extension: Create file systemwatcher with pattern *\python.exe
console.ts:134 [Extension Host] Python Extension: Create file systemwatcher with pattern *\*\python.exe
console.ts:134 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
console.ts:134 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
console.ts:134 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
console.ts:134 [Extension Host] Python Extension: Register Intepreter Watcher, Arg 1: undefined, Return Value: 
console.ts:134 [Extension Host] Python Extension: Build the workspace interpreter watcher, Arg 1: undefined, Return Value: UNABLE TO DETERMINE VALUE
console.ts:134 [Extension Host] Git installation not found.
t.log @ console.ts:134
t._logExtensionHostMessage @ extensionHost.ts:453
(anonymous) @ extensionHost.ts:244
emitTwo @ events.js:126
emit @ events.js:214
emit @ internal/child_process.js:772
_combinedTickCallback @ internal/process/next_tick.js:141
_tickCallback @ internal/process/next_tick.js:180
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
console.ts:134 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
console.ts:134 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 

[ericsnowcurrently]

Hi @PROFeNoM. Thanks for letting us know about this problem. Do you have this same problem using Python 3.4 or newer? The problem may lie in incompatibility with Python 3.1.

[PROFeNoM]

Yes, i also tried with python 3.7 and had the same problem, but i didn't tried with other versions

[ericsnowcurrently]

Do you have any other extensions installed? Sometimes they can causes problems for each other.

Just to be clear, I haven't been able to reproduce the problem. So I'm trying to narrow down the possible problem a bit.

[ericsnowcurrently]

Using the 2018.12.1 release of the extension I didn't have any problems and my logs looked similar to yours:

...
Python Extension: Display locator refreshing progress, , Return Value: 
Python Extension: Notify locators are locating, , Return Value: 
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
Python Extension: Display locator refreshing progress, , Return Value: 
Python Extension: Notify locators are locating, , Return Value: 
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
Python Extension: Build the workspace interpreter watcher, Arg 1: {"$mid":1,"fsPath":"<...>/test-py","external":"file://<...>/test-py","path":"<...>/test-py","scheme":"file"}, Return Value: UNABLE TO DETERMINE VALUE
Python Extension: Register Intepreter Watcher, Arg 1: undefined, Return Value: 
Python Extension: Build the workspace interpreter watcher, Arg 1: undefined, Return Value: UNABLE TO DETERMINE VALUE
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Hide locator refreshing progress, , Return Value: 
Python Extension: All locators have completed locating, , Return Value: 
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Hide locator refreshing progress, , Return Value: 
Python Extension: All locators have completed locating, , Return Value: 
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Hide locator refreshing progress, , Return Value: 
Python Extension: All locators have completed locating, , Return Value: 
...

With the latest unreleased build everything works and my logs looks like this:

Python Extension: Display locator refreshing progress, , Return Value: 
Python Extension: Notify locators are locating, , Return Value: 
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
Python Extension: Display locator refreshing progress, , Return Value: 
Python Extension: Notify locators are locating, , Return Value: 
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
Python Extension: Register Intepreter Watcher, Arg 1: <URI:<...>/test-py>, Return Value: undefined
Python Extension: Build the workspace interpreter watcher, Arg 1: <Uri:<...>/test-py>, Return Value: <Return value cannot be serialized for logging>
Python Extension: Display locator refreshing progress, , Return Value: 
Python Extension: Notify locators are locating, , Return Value: 
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
Python Extension: Register Intepreter Watcher, Arg 1: UNABLE TO DETERMINE VALUE, Return Value: undefined
Python Extension: Build the workspace interpreter watcher, Arg 1: UNABLE TO DETERMINE VALUE, Return Value: <Return value cannot be serialized for logging>
Python Extension: Checking whether locactors have completed locating, , Return Value: 
Python Extension: Hide locator refreshing progress, , Return Value: 
Python Extension: All locators have completed locating, , Return Value: 

In your logs I don't see any reference to a Python file (i.e. the one that triggered loading of the extension).

[tmchartrand]

I was having similar issues, which seemed to be due to the GitLens extension somehow. This extension now works fine with GitLens disable, although nothing obvious changed in the logs.

[ericsnowcurrently]

Thanks @tmchartrand. @PROFeNoM, do you have the gitlens extension installed/enabled? Do you have the problem after disabling any other extensions?

[saravalente]

I'm having the same problem with Python 3.7 on Mac OS. No other extensions installed.

[dan-blanchard]

I had this problem when VS Code 1.31.0 launched right after updating. Disabling GitLens temporarily made the Python extension finish loading. After that I was able to re-enable GitLens without issue.