*linejunk*: A function that accepts a single string argument, and returns
true if the string is junk, or false if not. The default is ``None``. There
is also a module-level function :func:`IS_LINE_JUNK`, which filters out lines
- without visible characters, except for at most one pound character (``'#'``)
+ without visible characters, except for at most one hash character (``'#'``)
-- however the underlying :class:`SequenceMatcher` class does a dynamic
analysis of which lines are so frequent as to constitute noise, and this
usually works better than using this function.