"Alan Gauld" <[email protected]> wrote
f.seek(0, 2)
pos, tailsize = divmod(f.tell(), bufsize)
if tailsize == 0:
pos = max(0, pos-1)
pos *= bufsize
f.seek(pos)
I got confused trying to work out exactly what this was doing.
pos is initially the number of times bufsize fits in the file, but
then gets modified to zero or one less than its current value.
I had another look during a cup of coffee and what I think you
are doing is positioning the cursor up to buffsize away from
the end of the file?
If so I think this is easier:
f.seek(0, os.SEEK_END) # goto end of file
offset = f.tell() % buffsize # trim off N buffers worth
if offset == 0: # if no tail backup one buffers
worth
offset = buffsize
f.seek(-offset, os.SEEK_END) # goto beginning of tail
If I misunderstood I'm sure someone will say! :-)
OTOH since you only use the last two lines why not miss all
that out and go straight to where you want to be with:
f.seek(-buffsize, os.SEEK_END) # goto one buffsize away from end
return f.read().split(linesep)[-2:]
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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