On Tue, 19 Mar 2013 07:20:57 -0700, razinzamada wrote:
> I'm currently trying to extract some data between 2 lines of an input
> file using Python. the infile is set up such that there is a line
> -START- where I need the next 10 lines of code if and only if the -END-
> condition occurs before the next -START-. The -START- line occurs many
> times before the -END-. Heres a general example of what I mean:
>
> blah
> blah
> -START-
> 10 lines I DONT need
> blah
> -START-
> 10 lines I need
> blah
> blah
> -END-
> blah
> blah
> -START-
> 10 lines I dont need
> blah
> -START-
>
> .... and so on and so forth
[...]
> heres the code I have for printing the -START- + 10 lines:
>
> in = open('input.log')
No it is not. "in" is a reserved word in Python, that code cannot
possibly work, it will give a SyntaxError.
Try this code. Untested but it should do want you want.
infile = open('input.log')
outfile = open('output.txt', 'a')
# Accumulate lines between START and END lines, ignoring everything else.
collect = False # Initially we start by ignoring lines.
for line in infile:
if '-START-' in line:
# Ignore any lines already seen, and start collecting.
accum = []
collect = True
elif '-END-' in line:
# Write the first ten accumulated lines.
outfile.writelines(accum[:10])
# Clear the accumulated lines.
accum = []
# and stop collecting until the next START line
collect = False
elif collect:
accum.append(line)
outfile.close()
infile.close()
--
Steven
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