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--ignore-missing-imports not working for modularized typeshed types #10283

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FuegoFro opened this issue Apr 6, 2021 · 2 comments · Fixed by #10582
Closed

--ignore-missing-imports not working for modularized typeshed types #10283

FuegoFro opened this issue Apr 6, 2021 · 2 comments · Fixed by #10582
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bug mypy got something wrong priority-0-high

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@FuegoFro
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FuegoFro commented Apr 6, 2021

Bug Report

Mypy does not respect the --ignore-missing-imports flag/ignore_missing_imports = True config for types that are now modularized out of typeshed (eg the legacy_bundled_packages).

I don't think this is a typeshed bug, but let me know if you disagree and I can make an issue there instead.

To Reproduce

Given the following file:

from redis.sentinel import Sentinel

I always get the following output:

python -m mypy --ignore-missing-imports example.py
example.py:1: error: Library stubs not installed for "redis.sentinel" (or incompatible with Python 3.7)
example.py:1: note: Hint: "python3 -m pip install types-redis"
example.py:1: note: (or run "mypy --install-types" to install all missing stub packages)
example.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 1 source file)

It doesn't matter whether --ignore-missing-imports is included or whether types-redis is installed, it will always give me exactly that output.

Note that a line like from foo_asdf import bar is correctly ignored by the --ignore-missing-imports flag and types that are defined by types-redis (like redis.StrictRedis) will work correctly (with or without the flag) when that package is installed.

Your Environment

  • Mypy version used: mypy 0.820+dev.e46aa6df6126cf47bea97bf9f94d7cba093d0103 (latest master at time of filing)
  • Mypy command-line flags: --ignore-missing-imports
  • Mypy configuration options from mypy.ini (and other config files): N/A
  • Python version used: Python 3.7.6
  • Operating system and version: macOS 10.15.7
@FuegoFro FuegoFro added the bug mypy got something wrong label Apr 6, 2021
@FuegoFro
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FuegoFro commented Apr 6, 2021

Digging into it a bit more this seems to be intentional:

mypy/mypy/build.py

Lines 2446 to 2452 in e46aa6d

# Don't honor a global (not per-module) ignore_missing_imports
# setting for modules that used to have bundled stubs, as
# otherwise updating mypy can silently result in new false
# negatives.
global_ignore_missing_imports = manager.options.ignore_missing_imports
if top_level in legacy_bundled_packages and global_ignore_missing_imports:
ignore_missing_imports = False

However even putting the more specific, non-global ignore in config (eg [mypy-redis.*] ignore_missing_imports = True) fails to suppress the error as long as the global --ignore-missing-imports/[mypy] ignore_missing_imports = True is set.

Given the comment, I wonder if the "fix" here is to look for a more specific ignore and honor that if it exists? Is that even feasible?

Either way it would be great to inform users that the --ignore-missing-imports flag is being intentionally ignored for this (somewhat arbitrary?) set of packages.

@JukkaL
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JukkaL commented Apr 13, 2021

I think that if we have ignore_missing_imports = True under [mypy-redis.*], mypy should honor it, even if ignore_missing_imports is set globally. So that seems like something we should fix by the next public release, assuming it's technically feasible. Otherwise, we should at least document this behavior clearly, as it's pretty unintuitive.

TheCleric added a commit to TheCleric/mypy that referenced this issue May 28, 2021
JukkaL added a commit that referenced this issue Jun 4, 2021
…d stubs

This makes `ignore_missing_imports` special by making it work a bit
differently, depending on whether it's set globally or per module.

The new behavior is less surprising. This makes it possible to ignore
arbitrary missing third-party stub packages, even those which used to
have bundled stubs.

Fixes #10283.
JukkaL added a commit that referenced this issue Jun 4, 2021
It has to be specified as a per-module option, if the library used
to have bundled stubs. This way mypy won't silently start ignoring
these missing stubs.

This makes `ignore_missing_imports` special by making it work a bit
differently, depending on whether it's set globally or per module.

The new behavior is less surprising. This makes it possible to ignore
arbitrary missing third-party stub packages, even those which used to
have bundled stubs.

Fixes #10283.
JukkaL added a commit that referenced this issue Jun 4, 2021
…0582)

It has to be specified as a per-module option, if the library used
to have bundled stubs. This way mypy won't silently start ignoring
these missing stubs.

This makes ignore_missing_imports special by making it work a bit
differently, depending on whether it's set globally or per module.

The new behavior is less surprising. This makes it possible to ignore
arbitrary missing third-party stub packages, even those which used to
have bundled stubs.

Fixes #10283.

Originally implemented by @TheCleric in #10283. This is somewhat
simpler alternative implementation which is easier to reason about and
may perform better in some cases of very large configs.
JukkaL added a commit that referenced this issue Jun 7, 2021
…0582)

It has to be specified as a per-module option, if the library used
to have bundled stubs. This way mypy won't silently start ignoring
these missing stubs.

This makes ignore_missing_imports special by making it work a bit
differently, depending on whether it's set globally or per module.

The new behavior is less surprising. This makes it possible to ignore
arbitrary missing third-party stub packages, even those which used to
have bundled stubs.

Fixes #10283.

Originally implemented by @TheCleric in #10283. This is somewhat
simpler alternative implementation which is easier to reason about and
may perform better in some cases of very large configs.
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