code: def Normal(mu, sigma, tag=None):
      
      assert sigma > 0, 'Normal "sigma" must be greater than zero'
      return uv(ss.norm(loc=mu, scale=sigma), tag=tag)
docs: A Normal (or Gaussian) random variate
      
      Parameters
      ----------
      mu : scalar
          The mean value of the distribution
      sigma : scalar
          The standard deviation (must be positive and non-zero)