Python Language Server predefined boolean constants issue

[Tim-Sobolev]

Environment data

• VS Code version: 1.29 (5f24c93878bd4bc645a4a17c620e2487b11005f9)
• Extension version: 2018.10.1
• OS and version: Debian 9.5
• Python version: 2.7.13 64-bit
• Type of virtual environment used: N/A
• Relevant/affected Python packages and their versions: N/A

Source code:

def x():
    return False

Actual behavior

Expected behavior

No warnings

Steps to reproduce:

Use provided source code

Error message:

{
	"resource": "/tmp/test.py",
	"owner": "_generated_diagnostic_collection_name_#0",
	"code": "use-before-def",
	"severity": 4,
	"message": "'False' used before definition",
	"source": "Python",
	"startLineNumber": 2,
	"startColumn": 12,
	"endLineNumber": 2,
	"endColumn": 17
}

First time noticed in 2018.9.2

Logs

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

Starting Microsoft Python language server.
Microsoft Python Language Server version 0.1.60.0
Initializing for /usr/bin/python

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

.../workbench.main.js:1446  INFO no standard startup: not the explorer viewlet
.../workbench.main.js:294 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Create file systemwatcher with pattern */python
.../workbench.main.js:294 [Extension Host] Python Extension: Create file systemwatcher with pattern */*/python
.../workbench.main.js:294 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Display locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Notify locators are locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Detected refreshing of Interpreters, Arg 1: {}, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Register Intepreter Watcher, Arg 1: undefined, Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Build the workspace interpreter watcher, Arg 1: undefined, Return Value: UNABLE TO DETERMINE VALUE
.../workbench.main.js:294 [Extension Host] Python Extension: Get language server folder name, , Return Value: "languageServer.0.1.60"
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Hide locator refreshing progress, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: All locators have completed locating, , Return Value: 
.../workbench.main.js:294 [Extension Host] Python Extension: Checking whether locactors have completed locating, , Return Value: 

[DonJayamanne]

Please could you fill in the rest of the issue template.
We need the missing information to be able to help you.

[Tim-Sobolev]

Issue was updated to actual state

[jimklo]

I'm seeing this same issue however on MacOS.

[brettcannon]

Duplicate of #3274