python 判断操作系统类型

import sys
run_system = None


if sys.platform.startswith('linux'):
    # print('当前系统为 Linux')
    run_system = 'linux'
elif sys.platform.startswith('win'):
    # print('当前系统为 Windows')
    run_system = 'windows'
elif sys.platform.startswith('darwin'):
    # print('当前系统为 macOS')
    run_system = 'macOS'
else:
    # print('无法识别当前系统')
    run_system = "unknown"


if __name__ == '__main__':
    print(run_system)