flake8 not showing fatal erros in vscode

Question

Vscode is not showing fatal erros in vscode. It is only highlighting warnings in the code. Example:

I have vscode running flake8 from a virtualenv with python 2.7. The settings is as following:

"python.linting.flake8Enabled": true,

I'm comparing the results from vscode "problems" window with the results of running flake8 directly from the command line.

def foo(bar):
    o += 1

    print(bar)

When I run flake8 from the command line on the code above, I get all linting errors and warnings,

> flake8 python/mock.py 
python/mock.py:4:5: F821 undefined name 'o'
python/mock.py:4:5: F841 local variable 'o' is assigned to but never used
python/mock.py:5:1: W293 blank line contains whitespace

while when I lint this code in vscode, I only getting the warnings.

blank line contains whitespace flake8(W293) [5,1]

Am I missing something in the configuration? Is there a way to check how flake8 is being called by vscode?

Answer 1

The default configuration works for me (also with Python2.7 on virtualenv).

Check that:

• The path to the flake8 executable is explicitly specified in settings.json

  # From terminal/console, install flake8 into your virtual environment
  $ pipenv install --dev flake8
  $ which flake8
  /absolute/path/to/virtualenvs/test-v9MbxBL-/bin/flake8
  
  # Set in settings.json
  "python.linting.flake8Path": "/absolute/path/to/virtualenvs/test-v9MbxBL-/bin/flake8",
  

• The severity for Fatal and Error categories are set to "Error":

  "python.linting.flake8CategorySeverity.F": "Error",
  "python.linting.flake8CategorySeverity.E": "Error",
  

• There are no ignored errors:

  "python.linting.flake8Args": [
      "--ignore=F821"
  ]
  

• There are no overriding flake8 settings from external sources

  Flake8 user options are read from the C:\Users\<username>\.flake8 (Windows) or ~/.config/flake8 (macOS/Linux) file.

  At the project level, options are read from the [flake8] section of a tox.ini, setup.cfg, or .flake8 file.