我相信问题在于您的输出末尾包含其他换行符。您可以通过调用 .strip（）来删除它们：

I believe the problem is your output contains additional new line character at the end. You can fix it by calling .strip() to remove those:

output = subprocess.check_output("./mount.sh", shell=True)
output = output.strip()

更新：如何查找字符串是否以换行符结尾？

请考虑以下交互式会话：

Update: How to Find out If a String Ends with New Line?

Consider the following interactive session:

>>> s = '''hello\n'''
>>> s.endswith('\n')
True