code: def euclidean(h1, h2): # 9 us @array, 33 us @list \w 100 bins
      r
      h1, h2 = __prepare_histogram(h1, h2)
      return math.sqrt(scipy.sum(scipy.square(scipy.absolute(h1 - h2))))
docs: r"""
      Equal to Minowski distance with :math:`p=2`.
      
      See also
      --------
      minowski