class_docstr: Class that creates a callable object to retrieve mouse clicks in a
  blocking way.
  
  This class will also retrieve keyboard clicks and treat them like
  appropriate mouse clicks (delete and backspace are like mouse button 3,
  enter is like mouse button 2 and all others are like mouse button 1).
docstr: This removes a click from the list of clicks.  Defaults to
  removing the last click.
docstr_tok: ["This","removes","a","click","from","the","list","of","clicks",".","Defaults","to","removing","the","last","click","."]
code: def pop_click(self, event, index=-1):
      """
      This removes a click from the list of clicks.  Defaults to
      removing the last click.
      """
      self.clicks.pop(index)
  
      if self.show_clicks:
          mark = self.marks.pop(index)
          mark.remove()
  
          self.fig.canvas.draw()
  
imports: from __future__ import absolute_import, division, print_function, unicode_literals
  import six
  import matplotlib.lines
  import logging
label_desc: Use image node_id 9 for calling the BlockingMouseInput obj's underlying member method code with example usage: obj.pop_click(event, index) without return types