Typical use is:
for line in textinput.lines():
This iterates over the lines of all files listed in sys.argv[1:],
defaulting to sys.stdin if the list is empty. If a filename is '-' it
is also replaced by sys.stdin. To specify an alternative list of
filenames, pass it as the argument to input(). A single file name is
TODO: Brief introduction on what you do with files - including link to relevant help section.