Black – Uncompromising Python code formatter

If the contents of the matching brackets pair are comma-separated (like an argument list, or a dict literal, and so on) then Black will first try to keep them on the same line with the matching brackets. Black will allow single empty lines inside functions, and single and double empty lines on module level left by the original editors, except when they’re within parenthesized expressions. If you are adopting Black in a large project with pre-existing string conventions (like the popular “single quotes for data, double quotes for human-readable strings”), you can pass on the command line.

Source: github.com