On Feb 19, 4:56 pm, Steve Holden <st...@holdenweb.com> wrote: > Chris Rebert wrote: > > On Thu, Feb 19, 2009 at 2:28 PM, Mike Driscoll <kyoso...@gmail.com> wrote: > >> On Feb 19, 4:22 pm, Mike Driscoll <kyoso...@gmail.com> wrote: > >>> On Feb 19, 3:56 pm, oamram <oam...@gmail.com> wrote: > > >>>> Hi Pythonist, > >>>> new to python. i have a directory with about 50 text file and i need to > >>>> iterate through them and get > >>>> line 7 to 11 from each file and write those lines into another file(one > >>>> file > >>>> that will contain all lines). > >>>> Cheers, Omer. > >>>> -- > >>>> View this message in > >>>> context:http://www.nabble.com/iterating-through-files-tp22048070p22048070.html > >>>> Sent from the Python - python-list mailing list archive at Nabble.com. > >>> I would recommend using the glob module to grab a list of the files > >>> you want or you can just create your own list. Then use a loop to grab > >>> the lines you want. Something like this: > > >>> f = open(textFile) > >>> newFile = open(newFileName, "a") > >>> x = 1 > >>> for line in f.readlines(): > >>> if x >=7 and x <=11: > >>> newFile.write(line + "\n") > > >>> You could even put the above inside a loop that loops over the list of > >>> files. Anyway, that's one approach. I'm sure there are many others. > > >>> Mike > >> Oops...I forgot to iterate the counter. The code should look like > >> this: > > >> <code> > > >> f = open(textFile) > >> newFile = open(newFileName, "a") > >> x = 1 > >> for line in f.readlines(): > >> if x >=7 and x <=11: > >> newFile.write(line + "\n") > >> x +=1 > > >> </code> > > > Or you could use enumerate(); also, readlines() isn't necessary: > > > f = open(textFile) > > newFile = open(newFileName, "a") > > for x, line in enumerate(f): > > if x >=7 and x <=11: > > newFile.write(line + "\n") > > > Sounds a bit like homework to me though... > > But all these solutions read the whole file. You should really read six > lines throwing them away then read five lines to keep.
It might be useful not to assume every file has at least 11 lines and program accordingly. > > Since this might be homework I'll not write the code, but it will > involve f.next() ... > > regards > Steve > -- > Steve Holden +1 571 484 6266 +1 800 494 3119 > Holden Web LLC http://www.holdenweb.com/- Hide quoted text - > > - Show quoted text - -- http://mail.python.org/mailman/listinfo/python-list
