how to read the last line of a huge file???

Fri Jan 28 01:29:10 EST 2011

On 2011年1月26日, Xavier Heruacles wrote:
> I have do some log processing which is usually huge. The length of each
> line is variable. How can I get the last line?? Don't tell me to use
> readlines or something like linecache...

file.seek takes an optional 'whence' argument which is 2 for the end, so you 
can just work back from there till you hit the first newline that has anything 
after it:
def lastline(filename):
 offset = 0
 line = ''
 with open(filename) as f:
 while True:
 offset -= 1
 f.seek(offset, 2)
 nextline = f.next()
 if nextline == '\n' and line.strip():
 return line
 else:
 line = nextline
John