Extract specific text lines?

Question

I have a large several hudred thousand lines text file. I have to extract 30,000 specific lines that are all in the text file in random spots. This is the program I have to extr

Answer 1

Aha! So your real problem is how to test many conditions per line and if one of them is satisfied, to output that line. Easiest will be using regular expression, me thinks:

import re
keywords = ['S0414', 'GT213', 'AT3423', 'PR342'] # etc - you probably get those from some source
pattern = re.compile('|'.join(keywords))

for line in inf:
    if pattern.search(ln):
        outf.write(line)