fix: annoying mypy error is annoying

[pauldambra]

lately I get an error when running mypy

i'm not the only one: https://posthog.slack.com/archives/C0113360FFV/p1733155706603479

AssertionError: Cannot find component 'trace' for 'opentelemetry.trace'

on updating to latest mypy I then get

OverflowError: int too big to convert

We can fix this by not writing to a mypy cache. Since that's what's failing

This is a workaround not a fix 🙈

---

Regardless of how I try to ignore it the last output we see in verbose mode is something like

LOG:  Cached module mimesis.providers.payment has same interface
LOG:  Writing mimesis.providers.internet /Users/paul/github/posthog/env/lib/python3.11/site-packages/mimesis/providers/internet.py mimesis/providers/internet.meta.json mimesis/providers/internet.data.json
LOG:  Build finished in 8.507 seconds with 7108 modules, and 0 errors
OverflowError: int too big to convert

if I delete the py.typed file in the mimesis package then we no longer get the error but things like

[mypy-mimesis.providers.*]
ignore_errors = True

in the mypy.ini didn't change anything

presumably mimesis has a very large number in it (or something that resolve to one) and when mypy tries to cache it the json serializer can't cope 🤷

i tried updating to mimesis v18 which didn't affect anything - and is a 13 major version jump so I didn't include it here

it isn't clear to me if this is a bug in mypy or mimesis or the overlap between them (or indeed something else 🙈)

[github-actions]

Size Change: 0 B

Total Size: 1.11 MB

ℹ️ View Unchanged

Filename	Size
frontend/dist/toolbar.js	1.11 MB

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[pauldambra]

downgrading to

mypy~=1.7.1
django-stubs==4.2.7

means no more errors running mypy
but hundreds more violations reported

[ioannisj]

Low context but makes sense

[pauldambra]

ok, this is silly. mypy results are apparently bouncing but 🤷

going to binary search in commits using uv pip install -r requirements.txt -r requirements-dev.txt && rm -rf .mypy_cache && mypy -p posthog | mypy-baseline filter && mypy -p posthog | mypy-baseline filter see if i can narrow down when things went wrong

[Twixes]

Where did this go? 🤯

[pauldambra]

i really like mypy, this is all very straight-forward and enjoyable

[pauldambra]

completely tore down my environment, and still get this result 🤷

[pauldambra]

i don't get the error today, but i've installed so many different versions of mypy and associated deps that i don't trust my machine