scandir, a better directory iterator

scandir is a Python library that provides a faster directory iterator and a faster `os.walk()` implementation than the standard library's `os.listdir()` and `os.walk()` for older Python versions. It backported the functionality that was later added to Python 3.5 as `os.scandir`. The current version is 1.10.0, with releases occurring infrequently as new Python versions are supported or critical fixes are needed.