Python read log files and get lines containing specific words

Question

Let's say I have some log files (In the format YYMMDD), then I would like to create a script that will get only information that is important from the files (like the lines that contain "O:NVS:VOICE"). Please help me guys, Because I'm totally new to python.

Answer 1

Look at the following code:

infile = r"D:\Documents and Settings\xxxx\Desktop\test_log.txt"

important = []

keep_phrases = ["test",

              "important",

              "keep me"]

with open(infile) as f:

    f = f.readlines()

for line in f:

    for phrase in keep_phrases:

        if phrase in line:

            important.append(line)

            break

print(important)

It's in no way, shape, or forms great, for instance, there is no exception handling or pattern matching, however, you can add these to it without any problem. Look into regular expression, which might be superior to express coordinating. On the off chance that your documents are extremely huge, read it line by line to keep away from a MemoryError.

Input file:

This line is super important!

don't need this one...

keep me!

bla bla

not bothered

ALWAYS include this test line

Output:

['This line is super important!\n', 'keep me!\n', 'ALWAYS include this test line']

PS: This is Python 3.3

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