def cbrt (x):
  """Returns the cube root of x."""
  if x >= 0: 
    return   math.pow(x     , 1.0 / 3.0)
  else:
    return - math.pow(abs(x), 1.0 / 3.0)
def cbrt ( x ) : if x >= 0 : return math . pow ( x , 1.0 / 3.0 ) else : return - math . pow ( abs ( x ) , 1.0 / 3.0 )
Returns the cube root of x.