code: def histogram(self, counts, bin_edges, linestyle='solid'):
          
          if len(bin_edges) - 1 != len(counts):
              raise RuntimeError(
                  'The length of bin_edges should be length of counts + 1')
          x = bin_edges
          y = list(counts) + [counts[-1]]
          self.plot(x, y, mark=None, linestyle=linestyle, use_steps=True)
docs: Plot a histogram.
  
          The user needs to supply the histogram.  This method only plots
          the results.  You can use NumPy's histogram function.
  
          :param counts: array containing the count values.
          :param bin_edges: array containing the bin edges.
          :param linestyle: the line style used to connect the data points.
              May be None, or any line style accepted by TikZ (e.g. solid,
              dashed, dotted, thick, or even combinations like
              "red,thick,dashed").
  
          Example::
  
              >>> plot = artist.Plot()
              >>> x = np.random.normal(size=1000)
              >>> n, bins = np.histogram(x)
              >>> plot.histogram(n, bins)