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