issues

@andersy005 I think it would be good to keep a running list of NamedArray tasks. I'll start with a rough sketch, please update/edit as you like.

• [x] Refactor out NamedArray base class (#8075)
• [x] publicize design doc: Scientific Python | Pangeo | NumPy Mailist
• [ ] Migrate VariableArithmetic to NamedArrayArithmetic (#8244)
• [ ] Migrate ExplicitlyIndexed array classes to array protocols
• [x] MIgrate from *Indexer objects to .oindex and .vindex on ExplicitlyIndexed array classes
• [ ] https://github.com/pydata/xarray/pull/8870
• [ ] Migrate unary ops
• [ ] Migrate binary ops
• [ ] Migrate nanops.py
• [x] Avoid "injecting" reduce methods potentially by using generate_reductions.py? (#8304)
• [ ] reprs and formatting.py
• [x] parallelcompat.py
• [ ] pycompat.py (#8244)
• [ ] https://github.com/pydata/xarray/pull/8276
• [ ] have test_variable.py test both NamedArray and Variable
• [x] Arrays with unknown shape #8291
• [ ] https://github.com/pydata/xarray/issues/8306
• [ ] https://github.com/pydata/xarray/issues/8310
• [ ] https://github.com/pydata/xarray/issues/8333
• [ ] Try to preserve imports from xarray.core/* by importing namedarray functionality into xarray.core/*

xref #3981

What is your issue?

Here's the output from the Scientific Python Repo Review tool.

There's an online version here.

On mac I run pipx run 'sp-repo-review[cli]' --format html --show err gh:pydata/xarray@main | pbcopy

A lot of these seem fairly easy to fix. I'll note that there's a large number of mypy config suggestions.

General

• Detected build backend: setuptools.build_meta
• Detected license(s): Apache Software License

<table> <tr><th>?</th><th>Name</th><th>Description</th></tr> <tr style="color: red;"> <td>❌</td> <td>PY007</td> <td> Supports an easy task runner (nox or tox)

Projects must have a noxfile.py or tox.ini to encourage new contributors.

</td> </tr> </table>

PyProject

See https://github.com/pydata/xarray/issues/8239#issuecomment-1739363809

<table> <tr><th>?</th><th>Name</th><th>Description</th></tr> <tr style="color: red;"> <td>❌</td> <td>PP305</td> <td> Specifies xfail_strict

xfail_strict should be set. You can manually specify if a check should be strict when setting each xfail.

[tool.pytest.ini_options]
xfail_strict = true

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>PP308</td> <td> Specifies useful pytest summary

-ra should be in addopts = [...] (print summary of all fails/errors).

[tool.pytest.ini_options]
addops = ["-ra", "--strict-config", "--strict-markers"]

</td> </tr> </table>

Pre-commit

<table> <tr><th>?</th><th>Name</th><th>Description</th></tr> <tr style="color: red;"> <td>❌</td> <td>PC110</td> <td> Uses black

Use https://github.com/psf/black-pre-commit-mirror instead of https://github.com/psf/black in .pre-commit-config.yaml

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>PC160</td> <td> Uses codespell

Must have https://github.com/codespell-project/codespell repo in .pre-commit-config.yaml

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>PC170</td> <td> Uses PyGrep hooks (only needed if RST present)

Must have https://github.com/pre-commit/pygrep-hooks repo in .pre-commit-config.yaml

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>PC180</td> <td> Uses prettier

Must have https://github.com/pre-commit/mirrors-prettier repo in .pre-commit-config.yaml

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>PC191</td> <td> Ruff show fixes if fixes enabled

If --fix is present, --show-fixes must be too.

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>PC901</td> <td> Custom pre-commit CI message

Should have something like this in .pre-commit-config.yaml:

ci:
  autoupdate_commit_msg: 'chore: update pre-commit hooks'

</td> </tr> </table>

MyPy

<table> <tr><th>?</th><th>Name</th><th>Description</th></tr> <tr style="color: red;"> <td>❌</td> <td>MY101</td> <td> MyPy strict mode

Must have strict in the mypy config. MyPy is best with strict or nearly strict configuration. If you are happy with the strictness of your settings already, ignore this check or set strict = false explicitly.

[tool.mypy]
strict = true

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>MY103</td> <td> MyPy warn unreachable

Must have warn_unreachable = true to pass this check. There are occasionally false positives (often due to platform or Python version static checks), so it's okay to ignore this check. But try it first - it can catch real bugs too.

[tool.mypy]
warn_unreachable = true

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>MY104</td> <td> MyPy enables ignore-without-code

Must have "ignore-without-code" in enable_error_code = [...]. This will force all skips in your project to include the error code, which makes them more readable, and avoids skipping something unintended.

[tool.mypy]
enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>MY105</td> <td> MyPy enables redundant-expr

Must have "redundant-expr" in enable_error_code = [...]. This helps catch useless lines of code, like checking the same condition twice.

[tool.mypy]
enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]

</td> </tr> <tr style="color: red;"> <td>❌</td> <td>MY106</td> <td> MyPy enables truthy-bool

Must have "truthy-bool" in enable_error_code = []. This catches mistakes in using a value as truthy if it cannot be falsey.

[tool.mypy]
enable_error_code = ["ignore-without-code", "redundant-expr", "truthy-bool"]

</td> </tr> </table>

Ruff

<table> <tr><th>?</th><th>Name</th><th>Description</th></tr> <tr style="color: red;"> <td>❌</td> <td>RF101</td> <td> Bugbear must be selected

Must select the flake8-bugbear B checks. Recommended:

[tool.ruff]
select = [
  "B",  # flake8-bugbear
]

</td> </tr> </table>