On Mon, Feb 11, 2013 at 1:26 PM, Steven D'Aprano < steve+comp.lang.pyt...@pearwood.info> wrote:
> inshu chauhan wrote: > > > In the programme below I am trying to read two csv format files and > > process them and write a new file with some of theirs data. > > > > import csv > > f1_reader = csv.reader(open(r"Z:\Weka > > work\Feature_Vectors_Fullset_00.arff")) > > f2_reader = csv.reader(open(r"Z:\Weka > > work\Feature_Vectors_Fullset_00_noxy+class.arff")) > > nf = open(r"Z:\Weka work\classified_image00_withoutxy.arff", "w") > > > > while True: > > l1 = f1_reader.next() > > while len(l1) != 12: > > l1 = f1_reader.next() > > l2 = f2_reader.next() > > while len(l2) != 11: > > l2 = f2_reader.next() > > > > ix = l1[0].strip() > > iy = l1[1].strip() > > classification = l2[8].strip() > > > > print >> nf, ix, iy, classification > > > > nf.close() > > > > This programme is giving me this error now : > > > > Traceback (most recent call last): > > File "Z:\Weka work\final_image_classificationwithoutxy.py", line 16, in > > <module> > > l2 = f2_reader.next() > > StopIteration > > > > > > what could be a possible reason to StopIteration ??? > > next() raises StopIteration when there is nothing else to return. > > > py> it = iter([1, 2, 3]) > py> it.next() > 1 > py> it.next() > 2 > py> it.next() > 3 > py> it.next() > Traceback (most recent call last): > File "<stdin>", line 1, in <module> > StopIteration > > > You have reached the end of the file and there is nothing else for the CSV > reader to return, so it raises StopIteration. > But why does it has nothing to return so early before traversing the whole file ? Is there any way it can be corrected ? And also the programme isn't writing anything to the file ? > > >
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