feat: Add Expr.round to Dask

[mistShard]

What type of PR is this? (check all applicable)

• 💾 Refactor
• ✨ Feature
• 🐛 Bug Fix
• 🔧 Optimization
• 📝 Documentation
• ✅ Test
• 🐳 Other

Related issues

• Related issue feat: add methods to Dask backend #637
• Closes #

Checklist

• Code follows style guide (ruff)
• Tests added
• Documented the changes

If you have comments or can explain your changes, please do so below.

[FBruzzesi]

Thanks for the PR. Tests are passing but marked as xfail!
After fixing that we can merge! 🙌🏼

[MarcoGorelli]

yup, @mistShard could you try removing the xfails from the round test for dask?

[MarcoGorelli]

could you try removing the xfails from the round test for dask?

[mistShard]

@MarcoGorelli I have done that and the tests do not run. I instead get this error:

INTERNALERROR>     self._warn_or_fail_if_strict(f"Unknown config option: {key}\n")
INTERNALERROR>   File "C:\Users\hp\Documents\Work\OpenTeams\narwhals\.venv\Lib\site-packages\_pytest\config\__init__.py", line 1487, in _warn_or_fail_if_strict
INTERNALERROR>     self.issue_config_time_warning(PytestConfigWarning(message), stacklevel=3)
INTERNALERROR>   File "C:\Users\hp\Documents\Work\OpenTeams\narwhals\.venv\Lib\site-packages\_pytest\config\__init__.py", line 1539, in issue_config_time_warning
INTERNALERROR>     warnings.warn(warning, stacklevel=stacklevel)
INTERNALERROR> pytest.PytestConfigWarning: Unknown config option: env

========================================================== no tests ran in 0.19s 

Do I need to update pytest?

[mistShard]

other tests also show the same error

[MarcoGorelli]

You need to update your environment, run

pip install -U -r requirements-dev.txt

[mistShard]

bit of a dumb question here. As a rule, how do I know by myself that my environment needs to be updated?

[mistShard]

@MarcoGorelli tests pass

[MarcoGorelli]

should be good, thanks @mistShard !