black:tldr:297f7

The command "black" is a command-line tool used for automatically formatting Python code to ensure consistent code style and readability. In the given command, "${filename_or_directory}" is a placeholder indicating that you need to specify a filename or a directory as an argument.

The purpose of using "black" with "${filename_or_directory}" is to apply the formatting rules defined by the tool to the specified Python file or files within the directory. This command will automatically reformat the code following the recommended guidelines such as indentation, line length, spacing, and other style conventions.

By running this command, you can quickly format your Python code without manual effort, ensuring that it adheres to a consistent coding style across your project.