CSS_STYLE attribute breaking packages

[Horndev]

The latest version has breaking changes for other packages. I would not expect this from a minor version increment.

For arviz:

  File "/usr/local/lib/python3.6/site-packages/arviz/utils.py", line 670, in <module>
    class HtmlTemplate:
  File "/usr/local/lib/python3.6/site-packages/arviz/utils.py", line 696, in HtmlTemplate
    css_template = f"<style> {xr.core.formatting_html.CSS_STYLE}{specific_style} </style>"
AttributeError: module 'xarray.core.formatting_html' has no attribute 'CSS_STYLE'

[shoyer]

xref #4297 (comment), arviz-devs/arviz#1387

xarray.core is not part of our public API. I can see why this could be confusing -- the modules does not use Python's standard underscore prefix -- but this is a fairly well established convention in the scientific Python ecosystem, e.g., you shouldn't rely upon imports from pandas.core or numpy.core either.

[nathdip]

What is the solution to this issue again? Should I downgrade either arviz or xarray?

[max-sixty]

There are a few options over at arviz-devs/arviz#1387 — either downgrade xarray or upgrade arviz to master

[nathdip]

Thanks for the help, that worked!