Get specific lines from log after a specific pattern

get_log_lines.py

import re
import linecache


def find_line_with_pattern(log_file_name, pattern):
    lines = open(log_file_name).readlines()
    for i, line in enumerate(lines):
        if re.match(pattern, line):
            return i+1


def get_lines_data(log_file_name, from_line, how_many_lines):
    numbers = [from_line+x for x in range(1, how_many_lines+1)]
    # print(numbers)
    lines = []
    for number in numbers:
        lines.append(linecache.getline(log_file_name, number))
    return "".join(lines)


def get_log_lines(log_file_name, find_pattern, lines_after_pattern):
    found_line_number = find_line_with_pattern(log_file_name, find_pattern)
    log_lines = get_lines_data(log_file_name, found_line_number, lines_after_pattern)
    print(log_lines)


if __name__ == "__main__":
    get_log_lines(
        log_file_name="D:\device_logs.txt",
        find_pattern=".*, job document:",
        lines_after_pattern=6
    )