Class Tail

Initialize a tail monitor.
path: filename to open
only_new: By default, the tail monitor will start reading from
  the beginning of the file when first opened. Set only_new to
  True to have it skip to the end when it first opens, so that
  you only get the new additions that arrive after you start
  monitoring. 
min_sleep: Shortest interval in seconds to sleep when waiting
  for more input to arrive. Defaults to 1.0 second.
sleep_interval: The tail monitor will dynamically recompute an
  appropriate sleep interval based on a sliding window of data
  arrival rate. You can set sleep_interval here to seed it
  initially if the default of 1.0 second doesn't work for you
  and you don't want to wait for it to converge.
max_sleep: Maximum interval in seconds to sleep when waiting
  for more input to arrive. Also, if this many seconds have
  elapsed without getting any new data, the tail monitor will
  check to see if the log got truncated (rotated) and will
  quietly reopen itself if this was the case. Defaults to 60.0
  seconds.

Overrides: object.__init__

Iterator interface, so you can do:

for line in filetail.Tail('log.txt'):
    # do stuff
    pass

Kick the iterator interface. Used under the covers to support:

for line in filetail.Tail('log.txt'):
    # do stuff
    pass