I do love a module that has a nice, simple purpose and a direct, to the point name :-)
walkdir - making it easier to use os.walk() to walk directories with filtering, depth limiting, flattening and handling of symlink loops to boot!
times - "everything sucks about our mechanisms to represent absolute moments in time, but the least worst one of all is UTC." Indeed. In a style similar to the explicit bytes/unicode objects in Python 3 with encodings explicitly dealt with at input and output, this library encourages times to be UTC internally, with timezones only every dealt with at input and output time.