#  -------------------------------
#  Difficult Rocket
#  Copyright © 2021-2022 by shenjackyuanjie 3695888@qq.com
#  All rights reserved
#  -------------------------------

"""
writen by shenjackyuanjie
mail:   3695888@qq.com
github: @shenjackyuanjie
gitee:  @shenjackyuanjie
"""


class Units:
    """
    base class of all units
    """

    def __init__(self):
        pass


class _Newton(Units):
    pass


newton = _Newton()


class _Metre(Units):
    pass


metre = _Metre()


class _Second(Units):
    pass


second = _Second()