def __str__(self):
    str = 'class=RatioTapChanger\n'
    attributes = self.__dict__
    for key in attributes.keys():
        str = ((str + key) + '={}\n'.format(attributes[key]))
    return str
def __str__(self):
    str = 'class=RatioTapChanger\n'
    attributes = self.__dict__
    for key in attributes.keys():
        str = ((str + key) + '={}\n'.format(attributes[key]))
    return str