On Jul 12, 4:46 pm, Billy Mays <no...@nohow.com> wrote:
> I want to make a generator that will return lines from the tail of
> /var/log/syslog if there are any
Err... I must have missed something, but python files are their own
iterators.
Python 2.6.6 (r266:84292, Sep 15 2010, 15:52:39)
[GCC 4.4.5] on linux2
Type "help", "copyright", "credits" or "license" for more information.
pythonrc start
pythonrc done
>>> f = open("/var/log/syslog")
>>> for line in f:
... print line
...
(snip unintersting syslog stuff))
>, but my function is reopening the file
> each call:
How do you know, and how do you call your function ?
> def getLines():
> with open('/var/log/syslog', 'rb') as f:
> while True:
> line = f.readline()
> if line:
> yield line
> else:
> raise StopIteration
>
> I know the problem lies with the StopIteration, but I'm not sure how to
> tell the caller that there are no more lines for now.
If you want the generator to wait until new content is available, just
remove the raise part - but you'll have a blocking call... Else, I
don't see what behaviour you are expecting exactly.
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