# autopep8 > Format Python code according to the PEP 8 style guide. > More information: . - Format a file to `stdout`, with a custom maximum line length: `autopep8 {{path/to/file.py}} --max-line-length {{length}}` - Format a file, displaying a diff of the changes: `autopep8 --diff {{path/to/file}}` - Format a file in-place and save the changes: `autopep8 --in-place {{path/to/file.py}}` - Recursively format all files in a directory in-place and save changes: `autopep8 --in-place --recursive {{path/to/directory}}`