Gah! Failed to reply to all again! On Sat, Nov 14, 2009 at 1:43 PM, Stephen Nelson-Smith <sanel...@gmail.com> wrote: > Hi, >> I'm not 100% sure to understand your needs and intention; just have a try. >> Maybe what you want actually is rather: >> >> for log in logs: >> for line in log: >> print l > > Assuming you meant print line. This also gives me just three lines. > >> Meaning your log objects need be iterable. To do this, you must have an >> __iter__ method that would surely simply return the object's getline (or >> maybe replace it alltogether). > > I'm not sure I fully understand how that works, but yes, I created an > __iter__ method: > > def __iter__(self): > self.line=self.logfile.readline() > stamp=self.timestamp(self.line) > heapq.heappush(self.heap, (stamp, self.line)) > pop = heapq.heappop(self.heap) > yield pop > > But I still don't see how I can iterate over it... I must be missing > something. > > I thought that perhaps I could make a generator function: > > singly = ((x.stamp, x.line) for x in logs) > for l in singly: > print > > But this doesn't seem to help either. > > >> Then when walking the log with for...in, python will silently call getline >> until error. This means getline must raise StopIteration when the log is >> "empty" and __iter__ must "reset" it. > > Yes, but for how long? Having added the __iter__ method, if I now do: > > for log in logs: > for line in log: > print line > > I still get only three results. > >> Another solution may be to subtype "file", for a file is precisely an >> iterator over lines; and you really get your data from a file. > > I'm very sorry - I'm not sure I understand. I get that a file is > iterable by definition, but I'm not sure how subtyping it helps. > >> Simply (sic), there must some job done about this issue of time stamps >> (haven't studied in details). Still, i guess this track may be worth an >> little study. > > Sorry for not understanding :( > >> Once you get logs iterable, you may subtype list for your overall log >> collection and set it an __iter__ method like: >> >> for log in self: >> for line in log: >> yield line >> >> (The trick is not from me.) > > OK - I make the logs iterable by giving them an __iter__ method - I > get that. I just don't know what you mean by 'subtype list'. > >> Then you can write: >> for line in my_log_collection > > That sounds useful.... > > S. >
-- Stephen Nelson-Smith Technical Director Atalanta Systems Ltd www.atalanta-systems.com _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
