Only the last trailing comma in a statement is magic

[andersk]

I would expect this to be left alone by the magic trailing comma rule:

zero(
    one,
).two(
    three,
).four(
    five,
)

But Black implodes it to

zero(one,).two(three,).four(
    five,
)

Environment (please complete the following information):

• Version: 20.8b1
• OS and Python version: Linux/Python 3.8.5

Does this bug also happen on master? Yes (playground)

[JelleZijlstra]

This is still broken (noting this because a similar bug with the magic trailing comma was fixed).

[thatlittleboy]

This is still broken on v22.3.0. Does anybody have any workarounds?

The only thing I can do now is to put parentheses around the method calls, then black will format the example in the original post like this:

(
    zero(
        one,
    )
    .two(
        three,
    )
    .four(
        five,
    )
)

---

Or maybe to kickstart potential PRs, can any black maintainer point us to the rough area in the codebase to look at which is causing this issue? Thanks.

[JelleZijlstra]

#2498 has some examples showing this is more general: if a statement contains multiple magic trailing commas, the magic only extends to one of them.

[Toreno96]

What's the status of this issue? This is still broken on v22.6.0 😞