Any idea to emulate tail -f

[Joel Juvenal Rivera Rivera]

I want to make something very similar to  the command tail -f (follow a
file), i have been trying  with some while True and some microsleeps
(about .1 s); did someone has already done something like this?

And about the file is the apache acceslog  of a site with a lot of
traffic.

Regards    

joe / Joel Rivera