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dmypy only formats output in json the first time it's executed #18713

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johnfn opened this issue Feb 20, 2025 · 4 comments · May be fixed by #18801
Open

dmypy only formats output in json the first time it's executed #18713

johnfn opened this issue Feb 20, 2025 · 4 comments · May be fixed by #18801
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bug mypy got something wrong topic-daemon dmypy

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@johnfn
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johnfn commented Feb 20, 2025 •
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Bug Report

dmypy only outputs in json the first time it's invoked with --output=json.

To Reproduce

dmypy stop
dmypy run -- --output=json
dmypy run -- --output=json

Expected Behavior

Every invocation returns JSON.

Actual Behavior

Only the first one does.

$ dmypy run -- --output=json
Daemon started
{"file": "myfile.py", "line": 3, "column": 0, "message": "Function is missing a type annotation", "hint": null, "code": "no-untyped-def", "severity": "error"}

$ dmypy run -- --output=json
a_different_file.py:22: error: Missing type parameters for generic type "Query"  [type-arg]

Your Environment

mypy --version
mypy 1.15.0 (compiled: yes)

python --version
Python 3.11.11
@johnfn johnfn added the bug mypy got something wrong label Feb 20, 2025
@sterliakov sterliakov added the topic-daemon dmypy label Feb 22, 2025
@Daksh2000
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Hi @johnfn , I tried this, and the first time it shows output in json and after that also it shows me output in json , but if I change something in the file , the it doesn't give output in json , I would have to stop the daemon and then start it again only after that it gives me output in json.
Is this the same thing that you described ?
If so , is the issue still available to pick , I would like to work on this

@johnfn
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johnfn commented Mar 9, 2025

Sounds similar to me!

@Daksh2000 Daksh2000 linked a pull request Mar 13, 2025 that will close this issue
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@Daksh2000
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Hi @johnfn , I created a PR for this , please have a look

@johnfn
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johnfn commented Mar 13, 2025

That's awesome! I'm not a contributor to mypy, but I'm looking forward to seeing it merged!

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dmypy formats output in json the first time it's executed | Bug Fix Daksh2000/mypy
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@johnfn @Daksh2000 @sterliakov