Python :如何查看是否打印了所有行？

with open('file.txt', 'r') as file:
    for line in file:
        print(line)

import logging

logging.basicConfig(filename='log.txt', level=logging.INFO)

with open('file.txt', 'r') as file:
    for line in file:
        logging.info(line)

import sys

sys.stdout = open('output.txt', 'w')

with open('file.txt', 'r') as file:
    for line in file:
        print(line)

sys.stdout.close()
sys.stdout = sys.__stdout__