missing-trailing-comma (COM812)

Derived from the flake8-commas linter.

Fix is always available.

What it does

Checks for the absence of trailing commas.

Why is this bad?

The presence of a trailing comma can reduce diff size when parameters or elements are added or removed from function calls, function definitions, literals, etc.

Example

foo = {
    "bar": 1,
    "baz": 2
}

Use instead:

foo = {
    "bar": 1,
    "baz": 2,
}

Formatter compatibility

We recommend against using this rule alongside the formatter. The formatter enforces consistent use of trailing commas, making the rule redundant.