boyeestudio wrote:
Please keep the discourse on c.l.py/python-list.
> Thanks a lot!
> I have modified it,and it works well now!
> but the KeyboardInterrupt on which I have a little problem.
> When I type CTRL+C,it show me an I/O error.
> it seems that even as I click the CTRL+C,the try block is to be invoked at
> the same time!
>
> import os
> import sys
> import time
>
> class Tail:
> def __init__(self,inputstream):
> self.inputstream=inputstream
> self.inputstream.seek(0,2)
>
> def tail(self):
> line=self.inputstream.read().strip()
> if not line:
> return
> print line
This may skip whitespace in the inputstream, probably not what you want.
> if __name__=="__main__":
> if len(sys.argv)<=1:
> print "You must type a file name"
> sys.exit()
> arg=file(sys.argv[1],'r+')
> t=Tail(arg)
As I told you, arg is always True. Change
> while(arg):
to
while True:
to make it obvious.
> try:
> t.tail()
> time.sleep(0.75)
> except KeyboardInterrupt:
> print "File closing"
> time.sleep(1)
> arg.close()
Put a
break
into the except clause, or you will never leave the loop in a controlled
manner. Alternatively, move the try ... except out ouf the loop:
try:
while True:
t.tail()
time.sleep(0.75)
except KeyboardInterrupt:
pass
arg.close()
Peter
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