

def    A_  (							a  ):

      """simple docstring"""



      if number < 0:
            raise ValueError('number must not be negative'  )
      return number & (number - 1) == 0


if __name__ == "__main__":
    import doctest

    doctest.testmod()









from math import pi

def    A_  (							a					,   a  ):

      """simple docstring"""



      return 2 * pi * radius * (angle / 3_6_0)


if __name__ == "__main__":
    print(arc_length(90, 10))






