autopep8: add page (#5645)

pages/common/autopep8.md

@@ -0,0 +1,20 @@
+# autopep8
+
+> Format Python code according to the PEP 8 style guide.
+> More information: <https://github.com/hhatto/autopep8>.
+
+- Format a file to stdout, with a custom maximium 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-pace 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}}`