# yapf > Python style guide checker. > More information: . - Display a diff of the changes that would be made, without making them (dry-run): `yapf {{[-d|--diff]}} {{path/to/file}}` - Format the file in-place and display a diff of the changes: `yapf {{[-d|--diff]}} {{[-i|--in-place]}} {{path/to/file}}` - Recursively format all Python files in a directory, concurrently: `yapf {{[-r|--recursive]}} {{[-i|--in-place]}} --style {{pep8}} {{[-p|--parallel]}} {{path/to/directory}}`