code: def pretty_plot(width=None, height=None, plt=None, dpi=None):
      
  
      if plt is None:
          plt = matplotlib.pyplot
          if width is None:
              width = matplotlib.rcParams['figure.figsize'][0]
          if height is None:
              height = matplotlib.rcParams['figure.figsize'][1]
  
          if dpi is not None:
              matplotlib.rcParams['figure.dpi'] = dpi
  
          fig = plt.figure(figsize=(width, height))
          fig.add_subplot(1, 1, 1)
  
      return plt
docs: Get a :obj:`matplotlib.pyplot` object with publication ready defaults.
  
      Args:
          width (:obj:`float`, optional): The width of the plot.
          height (:obj:`float`, optional): The height of the plot.
          plt (:obj:`matplotlib.pyplot`, optional): A :obj:`matplotlib.pyplot`
              object to use for plotting.
          dpi (:obj:`int`, optional): The dots-per-inch (pixel density) for
              the plot.
  
      Returns:
          :obj:`matplotlib.pyplot`: A :obj:`matplotlib.pyplot` object with
          publication ready defaults set.