On Sep 3, 2:21 pm, Olli Virta <llvi...@gmail.com> wrote:
> Hi!
>
> So I got this big textfile. It's full of data from a database. About
> 150 or
> more rows or lines in a textfile.
> There's three first rows that belong to the same subject. And then
> next
> three rows belong to another subject and so on, to the end of the
> file.
>
> What I need to do, is put the three rows that goes together and belong
> to
> certain subject, on a one line in the output textfile. And the next
> three
> rows again on a one new line. And that goes with the rest of the data
> to
> the end of the new file.
>
> Can't figure out a working loop structure to handle this.
>
> Thanks! OV
Straightforward generator version.
src = file('test_in.txt', 'r')
dst = file('test_out.txt', 'w')
def reader(src):
count, lines = 0, ''
for line in src:
if count < 2:
lines += line.strip()
count += 1
else:
yield lines + line
count, lines = 0, ''
if lines:
yield lines + '\n'
for lines in reader(src):
dst.write(lines)
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