code: def save_figure(self, *args):
      directory = os.path.expanduser(mpl.rcParams["savefig.directory"])
      filename = _macosx.choose_save_file(
          "Save the figure",
          directory,
          self.canvas.get_default_filename(),
      )
      if filename is None:  # Cancel
          return
      # Save dir for next time, unless empty str (which means use cwd).
      if mpl.rcParams["savefig.directory"]:
          mpl.rcParams["savefig.directory"] = os.path.dirname(filename)
      self.canvas.figure.savefig(filename)
  
imports: import os
  import matplotlib
  from matplotlib import _api, cbook
  from matplotlib._pylab_helpers import Gcf
  from .None import _macosx
  from .backend_agg import FigureCanvasAgg
  from matplotlib.backend_bases import _Backend, FigureCanvasBase, FigureManagerBase, NavigationToolbar2, ResizeEvent, TimerBase, _allow_interrupt
label_desc: Use image node_id 4 for calling the NavigationToolbar2Mac obj's underlying member method code with example usage: obj.save_figure() without return types