python 读取文件最后一行

with open('filename.txt', 'r') as file:
    lines = file.readlines()
    last_line = lines[-1] if lines else None
    print(last_line)

last_line = None
with open('filename.txt', 'rb') as file:  # 使用二进制模式避免编码问题
    file.seek(0, 2)  # 移动到文件末尾
    while True:
        line = file.readline()
        if not line:
            break
        last_line = line.decode()  # 如果文件是文本文件，需要解码
print(last_line)

import subprocess

result = subprocess.run(['tail', '-n', '1', 'filename.txt'], capture_output=True, text=True)
last_line = result.stdout.strip()
print(last_line)

try:
    with open('filename.txt', 'r') as file:
        lines = file.readlines()
        last_line = lines[-1] if lines else None
        print(last_line)
except FileNotFoundError:
    print("文件不存在")