Linting AND formatting not working

[Holt59]

Environment data

• VS Code version: 1.49.2
• Extension version (available under the Extensions sidebar): v2020.9.111407
• OS and version: Windows 10 10.0.18363 Build 18363
• Python version (& distribution if applicable, e.g. Anaconda): 3.7.2
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): venv
• Relevant/affected Python packages and their versions: flake8 3.8.3, black 20.8b1, flake8-black 0.2.1, mypy 0.782
• Relevant/affected Python-related VS Code extensions and their versions: XXX
• Value of the python.languageServer setting: 2020.9.111407 (I guess?)

Workspace settings:

{
    "editor.formatOnSave": true,
    "editor.formatOnPaste": true,
    "python.formatting.provider": "black",
    "python.linting.enabled": true,
    "python.linting.flake8Enabled": true,
    "python.linting.mypyEnabled": true,
    "python.pythonPath": "I:\\Languages\\Python\\envs\\my-env\\Scripts\\python.exe"
}

Expected behaviour

I expect formatting and linting to work.

Actual behaviour

Nothing happens.

Steps to reproduce:

[NOTE: Self-contained, minimal reproducing code samples are extremely helpful and will expedite addressing your issue]

1. Create any python file with linting / formatting issue.
2. Save the file or run Python linting or format document.
3. Nothing happens.

Logs

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

> I:\Languages\Python\envs\my-env\Scripts\python.exe "c:/Users/XXX/.vscode/extensions/ms-python.python-2020.9.111407/pythonFiles/pyvsc-run-isolated.py" mypy --warn-return-any --follow-imports=silent --show-column-numbers i:\Projects\my-project\main.py
cwd: i:\Projects\my-project
##########Linting Output - flake8##########
##########Linting Output - mypy##########
Error 2020-09-27 14:51:27: stderr jediProxy Error (stderr) c:\Users\XXX\.vscode\extensions\ms-python.python-2020.9.111407\pythonFiles\completion.py:587: DeprecationWarning: Deprecated since version 0.16.0. Use Script(...).get_names instead.
  all_scopes=True,

[karthiknadig]

Duplicate of #14078

[JD99]

Hey. pylance installation helped me