flake8 E704 Errors Triggered by Inline Ellipsis Formatting in Newer black Versions

[Camila Macedo]

how did you install flake8?

pip install -r file.txt
With the following versions


black==24.3.0
flake8==7.0.0
Flake8-pyproject==1.2.3

unmodified output of flake8 --bug-report

{
  "platform": {
    "python_implementation": "CPython",
    "python_version": "3.11.8",
    "system": "Darwin"
  },
  "plugins": [
    {
      "plugin": "Flake8-pyproject",
      "version": "1.2.3"
    },
    {
      "plugin": "mccabe",
      "version": "0.7.0"
    },
    {
      "plugin": "pycodestyle",
      "version": "2.11.1"
    },
    {
      "plugin": "pyflakes",
      "version": "3.2.0"
    }
  ],
  "version": "7.0.0"
}

describe the problem

what I expected to happen

I expected that updating to newer versions of black would maintain compatibility with flake8 by avoiding the E704: multiple statements on one line (def) error, consistent with the behavior observed in previous versions.

PS: Earlier versions of black (e.g., 22.6.0) formatted the ellipsis (...) on the next line, thereby avoiding the E704 error in flake8.

sample code

Before Update (black==22.6.0)
In the previous version of black, the formatter would automatically place the ellipsis (...) on a separate line when formatting functions or methods, like so:

def example_function(arg1: int, arg2: str) -> None:
    ...

After Update (black==24.3.0)
With the update to black version 24.3.0, the formatting behavior changed. Now, the ellipsis is placed on the same line as the function or method declaration:

def example_function(arg1: int, arg2: str) -> None: ...

commands ran

$ flake8
fileA.py:1440:5: E704 multiple statements on one line (def)
fileB.py:1444:5: E704 multiple statements on one line (def)
fileC.py:52:5: E704 multiple statements on one line (def)
fileD.py:55:5: E704 multiple statements on one line (def)
fileE.py:86:5: E704 multiple statements on one line (def)
fileF.py:90:5: E704 multiple statements on one line (def)
fileG.py:337:5: E704 multiple statements on one line (def)
fileH.py:341:5: E704 multiple statements on one line (def)

[Ian Stapleton Cordasco]

Duplicate of #1925