I'm new to python so if this is a silly question, pardon me.
I have the following basic assignment:
Take a user-specified range of lines from some data file, call it input, and write them to an output data file. What I want to do is have the user specify the range (for example lines 10-20) that will be picked from the input file to the output file. I am trying to use readlines() and I am able to get the program to pick a certain number of lines, but it always begins as line 1. For example, if I specify lines (30-200) it will recognize that it must extract 170 lines from the input file; however, it starts at line 1 and runs to line 170 instead of starting at line 30. Here is a snipet of the code:
first = int(raw_input('Enter a starting value'))
last = int(raw_input('Enter a final value'))
def add_line_numbers(infile, outfile):
f = open(infile,'r')
o = open(outfile,'w')
i = 1
for i in range(first, last):
--- Parsing code follows
The code originally worked fine until I began editing it. The original code takes an entire input file and transfers it to an entire output file. So only my edits are in question.
The 'i' acts as a counter, and that part works fine. The counter will read 30-200 for example; however, the lines that are inputing are still 1-170 from the original data type.
As I said, I am new to python and very amenable to suggestions so if you have a smarter way to tackled this problem, I am all ears.
This has been a very frustrating process. I'd appreciate help so much.