mypy type checking with Ray fails due to syntax warning

[bluenote10]

What happened + What you expected to happen

When type checking a project with mypy that use ray, the mypy type check prints warnings due to usages of invalid escape sequences in the Ray sources:

This is the output of running mypy . using ray 2.39.0:

/Users/.../lib/python3.12/site-packages/ray/data/grouped_data.py:350: SyntaxWarning: invalid escape sequence '\ '
  """Compute grouped min aggregation.
/Users/.../lib/python3.12/site-packages/ray/data/grouped_data.py:389: SyntaxWarning: invalid escape sequence '\ '
  """Compute grouped max aggregation.
/Users/.../lib/python3.12/site-packages/ray/data/grouped_data.py:428: SyntaxWarning: invalid escape sequence '\ '
  """Compute grouped mean aggregation.
/Users/.../lib/python3.12/site-packages/ray/data/grouped_data.py:470: SyntaxWarning: invalid escape sequence '\ '
  """Compute grouped standard deviation aggregation.

Our source files contains just an import ray and accesses ray.data.from_huggingface(...).

Looking at the master branch, the offending \ still seem to be there, but on different lines now:

ray/python/ray/data/grouped_data.py

Lines 357 to 358 in ba8674a

	... for i in range(100)]) \ # doctest: +SKIP
	... .groupby("A") \ # doctest: +SKIP

Versions / Dependencies

ray==2.39.0
mypy==1.13.0

Reproduction script

import ray

dummy = None
ray.data.from_huggingface(dummy)

Issue Severity

None