Help on method tight_layout in module matplotlib.figure:

tight_layout(renderer=None, pad=1.08, h_pad=None, w_pad=None, rect=None) method of matplotlib.figure.Figure instance
  Adjust subplot parameters to give specified padding.
  
  Parameters:
  
   *pad* : float
    padding between the figure edge and the edges of subplots,
    as a fraction of the font-size.
   *h_pad*, *w_pad* : float
    padding (height/width) between edges of adjacent subplots.
    Defaults to `pad_inches`.
   *rect* : if rect is given, it is interpreted as a rectangle
    (left, bottom, right, top) in the normalized figure
    coordinate that the whole subplots area (including
    labels) will fit into. Default is (0, 0, 1, 1).