Multiline terminal command isn't processed properly

I’ve included two notebooks, which are identical except for the terminal command.

• one with a single-line terminal command

! bq --location=US load --autodetect --skip_leading_rows=1 --source_format=CSV {dataset_id}.us_states_local_file 'resources/us-states.csv'

• one with a multi-line terminal command

!bq \
--location=US load \
--autodetect \
--skip_leading_rows=1 \
--source_format=CSV \
{dataset_id}.us_states_local_file \
'resources/us-states.csv'

The one with multiline doesn’t process properly, so when I run nbqa with black, I get:

Running black...
error: cannot format notebooks/official/bigquery_command_line_tool.ipynb: Cannot parse: cell_6:2:5: --lo 0x6AA55214

Archive.zip

[MarcoGorelli]

As an aside, seeing as you’re using nbQA at Google, I’d appreciate it if you could consider sponsoring the project

[MarcoGorelli]

OK, I see what’s happened - you’re missing the extra Jupyter requirements when running black on the notebooks, and so they’re been formatted as if they were Python files. You probably ran black on the notebooks when the version was still 20.8b1, right?

If you want Jupyter support for black, you need to install it as

pip install -U black[jupyter]

I’d advise:

• checkout your notebooks to the original state
• pip install -U black[jupyter]
• run black on the notebooks
• run any other linting checks

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The previous commit was fine btw (https://github.com/GoogleCloudPlatform/bigquery-notebooks/commit/56712e9a7f57c3acd047ae011fa98b8283c0611e)