import platform
import socket
import struct

def get_mac_address(interface='eth0') -> str:
    os_name = platform.system()
    if os_name=="Windows":
        return "mac_win_123"
    else:
        import fcntl
        sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        mac = fcntl.ioctl(
            sock.fileno(),
            0x8927,
            struct.pack('256s', interface[:15].encode('utf-8'))
        )
        mac_address = ':'.join(['%02x' % b for b in mac[18:24]])
        return mac_address


if __name__ == '__main__':
    mac_str=get_mac_address()
    print(mac_str)