make error message f-string

[tnakazato]

Trivial bug fix. Just adding "f" prefix to make the plain string f-string.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[tnakazato]

Finally, I have signed the CLA.

[tnakazato]

I also found that coordinate_utils.interpolate_data_coords_onto_parallel_coords doesn't allow to set "field_name" to ps_partition parameter, although docstring says it's supported. I have no solution yet. But it seems that field_name attribute is now 1-element string list rather than string. That should be the reason of the error. If ps_partition by "field_name" is supposed to work, I will create an Issue for that.

[Jan-Willem]

@tnakazato it is supposed to work. Can you please create an issue? Thanks.

[tnakazato]

@Jan-Willem, I've created #45.