print, others flagged as "Undefined variable" (requests being handled before initialization is complete?)

[JoeCodeswell]

Environment data

• Language Server version: 0.4.71.0
• OS and version: Microsoft Windows [Version 10.0.18362.418]
• Python version (& distribution if applicable, e.g. Anaconda): Python 3.5.1 (v3.5.1:37a07cee5969, Dec 6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32

Expected behaviour

print should NOT be flagged as "Undefined variable"

Actual behaviour

print is flagged as "Undefined variable"

Logs

N/A

Code Snippet / Additional lnformation

Python 3.5.1 (v3.5.1:37a07cee5969, Dec  6 2015, 01:54:25) [MSC v.1900 64 bit (AMD64)] on win32

[jakebailey]

Could you please provide the logs asked for in the template? I'd like to see the caching level you are using.

[JoeCodeswell]

Hi Jake. Thanks for the response. I think you want me to follow:

So I did Python › Analysis: Log Level
Defines type of log messages language server writes into the output window.
Trace

And Here's Output.Python:

   User belongs to experiment group 'AlwaysDisplayTestExplorer - control'
   User belongs to experiment group 'ShowPlayIcon - start'
   User belongs to experiment group 'ShowExtensionSurveyPrompt - control'
   User belongs to experiment group 'AA_testing - experiment'
   > conda --version
   > pyenv root
   > python3.7 -c "import sys;print(sys.executable)"
   > python3.6 -c "import sys;print(sys.executable)"
   > python3 -c "import sys;print(sys.executable)"
   > python2 -c "import sys;print(sys.executable)"
   > python -c "import sys;print(sys.executable)"
   > py -3.7 -c "import sys;print(sys.executable)"
   > py -3.6 -c "import sys;print(sys.executable)"
   > py -3 -c "import sys;print(sys.executable)"
   > py -2 -c "import sys;print(sys.executable)"
   > python -c "import sys;print(sys.executable)"
   > conda info --json
   Starting Microsoft Python language server.
   > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\cygwin64\bin\python2.7.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\cygwin64\bin\python2.7.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Program Files (x86)\LilyPond\usr\bin\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Program Files (x86)\LilyPond\usr\bin\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Program Files (x86)\LilyPond\usr\bin\python2.4.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Program Files (x86)\LilyPond\usr\bin\python2.4.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
   > conda info --json
   > conda --version

I hope this is what you wanted.
Thanks again, Jake.
Love and peace,
Joe

[JoeCodeswell]

I just did a second run of my program just to be sure. Here's Output.python again.

    User belongs to experiment group 'AlwaysDisplayTestExplorer - control'
    User belongs to experiment group 'ShowPlayIcon - start'
    User belongs to experiment group 'ShowExtensionSurveyPrompt - control'
    User belongs to experiment group 'AA_testing - experiment'
    > conda --version
    > pyenv root
    > python3.7 -c "import sys;print(sys.executable)"
    > python3.6 -c "import sys;print(sys.executable)"
    > python3 -c "import sys;print(sys.executable)"
    > python2 -c "import sys;print(sys.executable)"
    > python -c "import sys;print(sys.executable)"
    > py -3.7 -c "import sys;print(sys.executable)"
    > py -3.6 -c "import sys;print(sys.executable)"
    > py -3 -c "import sys;print(sys.executable)"
    > py -2 -c "import sys;print(sys.executable)"
    > python -c "import sys;print(sys.executable)"
    > conda info --json
    Starting Microsoft Python language server.
    > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\cygwin64\bin\python2.7.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\cygwin64\bin\python2.7.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Program Files (x86)\LilyPond\usr\bin\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Program Files (x86)\LilyPond\usr\bin\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Program Files (x86)\LilyPond\usr\bin\python2.4.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Program Files (x86)\LilyPond\usr\bin\python2.4.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > C:\Python27\python.exe c:\Users\joeco\.vscode\extensions\ms-python.python-2019.10.41019\pythonFiles\interpreterInfo.py
    > conda info --json
    > conda --version

[jakebailey]

I see, you don't have trace logging enabled and I think you're in the wrong output tab. Add "python.analysis.logLevel": "Trace" to your settings and reload, and your logs should be more verbose. You can find them in the "Python Language Server" part of the output panel (in the dropdown). See: https://github.com/microsoft/python-language-server/blob/master/TROUBLESHOOTING.md#filing-an-issue

[JoeCodeswell]

Hi Jake. Thanks for your patience. I just

1. set "python.analysis.logLevel": "Trace" in File>>Preferences>>Settings.
2. restarted vscode which NOW comes up with Update 1.39.2!
3. checked settings & still "python.analysis.logLevel" == Trace

I reopened the "offending" program == test_jsonschema.py & NOW print IS NOT FLAGGED as Undefined variable!

How time flies when you're having fun!

I just ran test_jsonschema.py

Now i open OUTPUT & select THE SECOND Python Language Server entry in the dropdown. N.B. the first had no output in the window.

Here is what the OUTPUT window says:

I am attaching the output as vscodePyLangServerLog.txt

vscodePyLangServerLog.txt

[jakebailey]

Caching is disabled in those logs, so that's interesting.

Reloading fixing it doesn't surprise me, as the analysis will have been rerun.

[sdpenguin]

I am having a similar issue with inbuilt functions and types such as ValueError and float. I tried changing the settings as described above to Trace and this made the Undefined Variable error go away.

[jakebailey]

Changing the logging setting wouldn't have any effect. If you reloaded the editor when you changed the setting, the reload is what would have likely fixed it.

[pcolmer]

I'm having the same problem of "print" being marked as an undefined variable.

Trace output attached.
trace-logs.txt

[kuelumbus]

I can confirm this problem. I am having it for all built-ins (dict, len, print, list, ...) ?

python.analysis.cachingLevel is set to None to fix #1601 .

[jakebailey]

To be clear, after disabling caching, did you restart the language server? I don't know if we currently handle the case of going from caching to no caching within the same run (the other way would work, though be less efficient).

[kuelumbus]

Thanks. I did restart. Also, I find [Info - 9:35:07 AM] Analysis caching mode: None. in the log file.

BTW, analyzing in background is now very slow. It takes hours to finish and afterward, I am having the Undefined variable ... problem.

[eerovil]

I'm having the same problem, but reloading resolves it. For now I have to reload every hour or so.

[markedwards]

This issue appears to affect many basic Python objects, like str. Attaching screenshot.

[jakebailey]

Essentially this appears to be happening to anything that's declared in the global scope; things like print, str, and len, aren't "keywords" per se, but actual variables that exist in the scope and can be reassigned like any other variable, so we declare them in every module before analyzing. That's what appears to either not happen, or get lost along the way.

Working on #1601 and #1414 may preclude this, since they affect the analysis order.