read lines from file in reverse order and write to stdout till match is found

tail-till.py

import os
import sys
def readlines_reverse(filename):
    with open(filename) as qfile:
        qfile.seek(0, os.SEEK_END)
        position = qfile.tell()
        line = ''
        while position >= 0:
            qfile.seek(position)
            next_char = qfile.read(1)
            if next_char == "\n":
                yield line[::-1]
                line = ''
            else:
                line += next_char
            position -= 1
        yield line[::-1]


def main():
    infile_path = sys.argv[1]
    queries = str(sys.argv[2]).split(',')

    for line in readlines_reverse(infile_path):
        found = True
        for query in queries:
            if line.find(query) <= -1:
                found = False
                break
        if found:
            break        
        print(line)

if __name__ == '__main__':
    main()