mypy running twice?

[shaperilio]

I open VSCode, put some bad code in a file, save it, and this is the output I see:

2024-01-02 17:07:49.655 [info] Name: Mypy Type Checker
2024-01-02 17:07:49.655 [info] Module: mypy
2024-01-02 17:07:49.655 [info] Python extension loading
2024-01-02 17:07:49.655 [info] Waiting for interpreter from python extension.
2024-01-02 17:07:49.655 [info] Python extension loaded
2024-01-02 17:07:49.655 [info] Server run command: c:\Users\1\repo\venv\Scripts\python.exe c:\Users\1\.vscode\extensions\ms-python.mypy-type-checker-2023.6.0\bundled\tool\lsp_server.py
2024-01-02 17:07:49.655 [info] Server: Start requested.
2024-01-02 17:07:50.305 [info] CWD Server: c:\Users\1\repo
2024-01-02 17:07:50.315 [info] Settings used to run Server:
[
    {
        "cwd": "c:\\Users\\1\\repo",
        "workspace": "file:///c%3A/Users/1/repo",
        "args": [],
        "severity": {
            "error": "Error",
            "note": "Information"
        },
        "path": [],
        "ignorePatterns": [],
        "interpreter": [
            "c:\\Users\\1\\repo\\venv\\Scripts\\python.exe"
        ],
        "importStrategy": "useBundled",
        "showNotifications": "off",
        "extraPaths": [],
        "reportingScope": "file",
        "preferDaemon": false
    }
]

2024-01-02 17:07:50.316 [info] Global settings:
{
    "cwd": "${workspaceFolder}",
    "workspace": "C:\\Users\\1\\AppData\\Local\\Programs\\Microsoft VS Code",
    "args": [],
    "severity": {
        "error": "Error",
        "note": "Information"
    },
    "path": [],
    "ignorePatterns": [],
    "interpreter": [],
    "importStrategy": "useBundled",
    "showNotifications": "off",
    "extraPaths": [],
    "reportingScope": "file",
    "preferDaemon": false
}

2024-01-02 17:07:50.318 [info] sys.path used to run Server:
   c:\Users\1\repo
   c:\Users\1\.vscode\extensions\ms-python.mypy-type-checker-2023.6.0\bundled\libs
   c:\Users\1\.vscode\extensions\ms-python.mypy-type-checker-2023.6.0\bundled\tool
   C:\Program Files\Python38\python38.zip
   C:\Program Files\Python38\DLLs
   C:\Program Files\Python38\lib
   C:\Program Files\Python38
   c:\Users\1\repo\venv
   c:\Users\1\repo\venv\lib\site-packages
   c:\Users\1\repo\venv\lib\site-packages\win32
   c:\Users\1\repo\venv\lib\site-packages\win32\lib
   c:\Users\1\repo\venv\lib\site-packages\Pythonwin
2024-01-02 17:07:50.318 [info] c:\Users\1\repo\venv\Scripts\python.exe -m mypy --version
2024-01-02 17:07:50.318 [info] CWD Server: c:\Users\1\repo
2024-01-02 17:07:50.558 [info] 
mypy 1.6.1 (compiled: no)


2024-01-02 17:07:50.558 [info] Version info for linter running for C:\Users\1\repo:
mypy 1.6.1 (compiled: no)

2024-01-02 17:07:50.558 [info] SUPPORTED mypy>=1.0.0
FOUND mypy==1.6.1

2024-01-02 17:07:50.569 [info] [Trace - 5:07:50 PM] Received notification 'window/logMessage'.
2024-01-02 17:07:50.569 [info] c:\Users\1\repo\venv\Scripts\python.exe -m mypy --no-color-output --no-error-summary --show-absolute-path --show-column-numbers --show-error-codes --no-pretty --show-error-end c:\Users\1\repo\setup.py
2024-01-02 17:07:50.569 [info] [Trace - 5:07:50 PM] Received notification 'window/logMessage'.
2024-01-02 17:07:50.569 [info] CWD Server: c:\Users\1\repo
2024-01-02 17:07:51.244 [info] [Trace - 5:07:51 PM] Received notification 'window/logMessage'.
2024-01-02 17:07:51.244 [info] file:///c%3A/Users/1/repo/setup.py :
c:\Users\1\repo\setup.py:14:1:32:7: error: Missing return statement  [empty-body]

2024-01-02 17:07:51.250 [info] [Trace - 5:07:51 PM] Received notification 'window/logMessage'.
2024-01-02 17:07:51.250 [info] file:///c%3A/Users/1/repo/setup.py :
c:\Users\1\repo\setup.py:14:1:32:7: error: Missing return statement  [empty-body]

2024-01-02 17:07:51.251 [info] [Trace - 5:07:51 PM] Received notification 'textDocument/publishDiagnostics'.

It looks as if mypy is running twice; the version is reported twice and the same error is reported twice.

[karthiknadig]

mypy has only run once, we log the raw output from mypy and once more when we parse it. So you see the result shown twice in logs. But you see the command line run only once.

[ollie-bell]

mypy has only run once, we log the raw output from mypy and once more when we parse it. So you see the result shown twice in logs. But you see the command line run only once.

It seems to me like duplicate error reporting is an issue. Every mypy error is duplicated when I use this extension. Happy to open a new issue if this is not related to this issue, but OP reports "same error is reported twice." so I believe I am seeing the same issue.

EDIT:

It seems like uninstalling and re-installing the extension has resolved this issue.