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Latest black (25.1.0) adds a newline after docstring and before pass in an exception class #4571

@simonw

Description

@simonw

This file:

class ModelError(Exception):
    "Models can raise this error, which will be displayed to the user"
    pass

When run through the latest Black is reformatted to look like this:

class ModelError(Exception):
    "Models can raise this error, which will be displayed to the user"

    pass

Here's a way to see that happen using uvx. With the previous Black version:

echo 'class ModelError(Exception):
    "Models can raise this error, which will be displayed to the user"
    pass' | uvx --with 'black==24.10.0' black -

This outputs:

class ModelError(Exception):
    "Models can raise this error, which will be displayed to the user"
    pass
All done! ✨ 🍰 ✨
1 file left unchanged.

But if you bump to 25.1.0 this happens:

echo 'class ModelError(Exception):
    "Models can raise this error, which will be displayed to the user"
    pass' | uvx --with 'black==25.1.0' black - 

Output:

class ModelError(Exception):
    "Models can raise this error, which will be displayed to the user"

    pass
reformatted -

All done! ✨ 🍰 ✨
1 file reformatted.

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