I kept getting an error message when trying to save Python files in VSCode and it had something to do with pyenv and mypy.
Error running mypy in /Users/Scott/Desktop/DATA/SORT/CodingProgrammingPython/traversy_btre_project: mypy failed with error: "pyenv: dmypy: command not found". See Output panel for details.
Googling turned up nothing relevant so I just had to poke around. To be honest, I’m still not perfectly clear on the issue but it seems that the default settings of mypy weren’t pointed to the mypy daemon (dmypy) installed in my pyenv installations/ shims. In VScode, I went to Code > Preferences > Extensions and searched for mypy.
From there I clicked the gear icon and selected Extension Settings.
I clicked the checkbox that says Mypy: Run Using Active Interpreter and that seems to resolve the issue.
Alternatively, you can change the Mypy: Dmypy Executable setting, although this only works for me on the project folder settings, not user settings that I would think would apply to all of my projects. For this you need to get the path to mypy’s daemon. In Terminal, from whichever folder/ virtual environment you’re running type which mypy. In my case that returns /Users/Scott/.pyenv/versions/3.9.1/envs/traversy_btre_project/bin/mypy. If you haven’t already, click the tab to take you to the project folder settings, not the default user settings and when you enter the path for the Mypy: Dmypy Executable, remember to append a d in front of mypy in your path. In my case that means /Users/Scott/.pyenv/versions/3.9.1/envs/traversy_btre_project/bin/dmypy.
Here’s the full Terminal error message before I changed the settings:
[22] Error running mypy in /Users/Scott/Desktop/DATA/SORT/CodingProgrammingPython/traversy_btre_project: mypy failed with error: "pyenv: dmypy: command not found". See Output panel for details.
Document saved: /Users/Scott/Desktop/DATA/SORT/CodingProgrammingPython/traversy_btre_project/btre/settings.py
[23] Check workspace: /Users/Scott/Desktop/DATA/SORT/CodingProgrammingPython/traversy_btre_project
[23] Received python path from Python extension: /Users/Scott/.pyenv/versions/3.9.1/envs/traversy_btre_project/bin/python
[23] Running dmypy in folder /Users/Scott/Desktop/DATA/SORT/CodingProgrammingPython/traversy_btre_project
/Users/Scott/.pyenv/shims/dmypy --status-file '/Users/Scott/Library/Application Support/Code/User/workspaceStorage/0b5d5df9c8fb7d5b31262bb092c70e03/matangover.mypy/dmypy-3bc5a742efe88c8e510ad328c3fbedd5ea9383c3.json' run --log-file '/Users/Scott/Library/Application Support/Code/User/workspaceStorage/0b5d5df9c8fb7d5b31262bb092c70e03/matangover.mypy/dmypy-3bc5a742efe88c8e510ad328c3fbedd5ea9383c3.log' -- . --show-column-numbers --no-error-summary --no-pretty --no-color-output --python-executable /Users/Scott/.pyenv/versions/3.9.1/envs/traversy_btre_project/bin/python
[23] stderr:
pyenv: dmypy: command not found
The `dmypy' command exists in these Python versions:
3.9.1/envs/oreilly_beyond_basic_programming
3.9.1/envs/oreilly_complete_python
3.9.1/envs/oreilly_python_survival_skills
3.9.1/envs/traversy_btre_project
oreilly_beyond_basic_programming
oreilly_complete_python
oreilly_python_survival_skills
traversy_btre_project
Note: See 'pyenv help global' for tips on allowing both
python2 and python3 to be found.
[23] Error running mypy in /Users/Scott/Desktop/DATA/SORT/CodingProgrammingPython/traversy_btre_project: mypy failed with error: "pyenv: dmypy: command not found". See Output panel for details.