`--exclude` not working as expected

[RaenonX]

Not sure if this is a bug, already consulted the docs, so using this form.

Here's I ran:

PS E:\Personal@SSD\Game\DL\dragalia-data-parse> mypy --verbose tests/conftest.py

LOG:  Mypy Version:           0.910
LOG:  Config File:            pyproject.toml
LOG:  Configured Executable:  e:\personal@ssd\game\dl\dragalia-data-parse\venv\scripts\python.exe
LOG:  Current Executable:     e:\personal@ssd\game\dl\dragalia-data-parse\venv\scripts\python.exe
LOG:  Cache Dir:              .mypy_cache
LOG:  Compiled:               True
LOG:  Exclude:                /tests/
LOG:  Found source:           BuildSource(path='tests\\conftest.py', module='tests.conftest', has_text=False, base_dir='E:\\Personal@SSD\\Game\\DL\\dragalia-data-parse')
LOG:  Could not load cache for tests.conftest: tests\conftest.meta.json
LOG:  Metadata not found for tests.conftest
LOG:  Parsing tests\conftest.py (tests.conftest)
LOG:  Skipping E:\Personal@SSD\Game\DL\dragalia-data-parse\tests\__init__.py (tests)
LOG:  Skipping e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\pytest\__init__.py (pytest)
LOG:  Skipping E:\Personal@SSD\Game\DL\dragalia-data-parse\dlparse\mono\manager.py (dlparse.mono.manager)
LOG:  Skipping E:\Personal@SSD\Game\DL\dragalia-data-parse\dlparse\transformer\__init__.py (dlparse.transformer)
LOG:  Skipping E:\Personal@SSD\Game\DL\dragalia-data-parse\tests\static.py (tests.static)
LOG:  Metadata fresh for builtins: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\builtins.pyi
LOG:  Metadata fresh for sys: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\sys.pyi
LOG:  Metadata fresh for types: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\types.pyi
LOG:  Metadata fresh for _typeshed: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\_typeshed\__init__.pyi
LOG:  Metadata fresh for ast: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\ast.pyi
LOG:  Metadata fresh for io: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\io.pyi
LOG:  Metadata fresh for typing: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\typing.pyi
LOG:  Metadata fresh for typing_extensions: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\typing_extensions.pyi
LOG:  Metadata fresh for importlib.abc: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\importlib\abc.pyi
LOG:  Metadata fresh for importlib.machinery: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\importlib\machinery.pyi
LOG:  Metadata fresh for array: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\array.pyi
LOG:  Metadata fresh for mmap: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\mmap.pyi
LOG:  Metadata fresh for os: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\os\__init__.pyi
LOG:  Metadata fresh for _ast: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\_ast.pyi
LOG:  Metadata fresh for codecs: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\codecs.pyi
LOG:  Metadata fresh for collections: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\collections\__init__.pyi
LOG:  Metadata fresh for abc: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\abc.pyi
LOG:  Metadata fresh for importlib: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\importlib\__init__.pyi
LOG:  Metadata fresh for posix: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\posix.pyi
LOG:  Metadata fresh for subprocess: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\subprocess.pyi
LOG:  Metadata fresh for os.path: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\os\path.pyi
LOG:  Metadata fresh for _collections_abc: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\_collections_abc.pyi
LOG:  Metadata fresh for ntpath: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\ntpath.pyi
LOG:  Metadata fresh for genericpath: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\genericpath.pyi
LOG:  Metadata fresh for posixpath: file e:\personal@ssd\game\dl\dragalia-data-parse\venv\lib\site-packages\mypy\typeshed\stdlib\posixpath.pyi
LOG:  Loaded graph with 26 nodes (0.045 sec)
LOG:  Found 2 SCCs; largest has 25 nodes
LOG:  Processing 1 queued fresh SCCs
LOG:  Processing SCC singleton (tests.conftest) as inherently stale
tests\conftest.py:66: error: Function is missing a type annotation  [no-untyped-def]
tests\conftest.py:76: error: Function is missing a type annotation  [no-untyped-def]
LOG:  Deleting tests.conftest tests\conftest.py tests\conftest.meta.json tests\conftest.data.json
LOG:  No fresh SCCs left in queue
LOG:  Build finished in 0.114 seconds with 26 modules, and 2 errors
Found 2 errors in 1 file (checked 1 source file)

Here's what I have in my pyproject.toml

[tool.mypy]
follow_imports = "skip"
exclude = "/tests/"
show_error_codes = true
disable_error_code = "misc"
disallow_untyped_defs = true
disallow_untyped_decorators = true
disallow_any_expr = true

Added follow_imports = "skip" because some issue about the --exclude flag is because of that.

I expect the file I intend to check to be excluded, however it's not. I also tried the following patterns, but none of them works.

• /tests
• tests/
• tests
• ./tests/
• ./tests
• (^|\\.?)/tests/
• (^|\\.)/tests/

Double backslash for escape in toml.

I am using Windows 10.

[emmatyping]

The docs for exclude state

A regular expression that matches file names, directory names and paths which mypy should ignore while recursively discovering files to check

I think if you explicitly pass a file to mypy it will still get checked, even if it is matched by the exclude regex, and this appears to be documented behavior.

[bluebrown]

Its maybe also worth adding this info about the behaviour of exclude:

Note that this flag only affects recursive discovery, that is, when mypy is discovering files within a directory tree or submodules of a package to check. If you pass a file or module explicitly it will still be checked. For instance, mypy --exclude '/setup.py$' but_still_check/setup.py.