code: def hist(self):
          
          _ = pylab.hist(self._data, bins=self.bins, density=True)
          pylab.grid(True)
docs: Draw normed histogram of the data using :attr:`bins`
  
          .. plot::
  
              >>> from scipy import stats
              >>> data = stats.gamma.rvs(2, loc=1.5, scale=2, size=20000)
              >>> # We then create the Fitter object
              >>> import fitter
              >>> fitter.Fitter(data).hist()