code: def enable_tk(self, app=None):
          
          self._current_gui = GUI_TK
          if app is None:
              try:
                  import Tkinter as _TK
              except:
                  # Python 3
                  import tkinter as _TK  # @UnresolvedImport
              app = _TK.Tk()
              app.withdraw()
              self._apps[GUI_TK] = app
  
          from pydev_ipython.inputhooktk import create_inputhook_tk
          self.set_inputhook(create_inputhook_tk(app))
          return app
docs: Enable event loop integration with Tk.
  
          Parameters
          ----------
          app : toplevel :class:`Tkinter.Tk` widget, optional.
              Running toplevel widget to use.  If not given, we probe Tk for an
              existing one, and create a new one if none is found.
  
          Notes
          -----
          If you have already created a :class:`Tkinter.Tk` object, the only
          thing done by this method is to register with the
          :class:`InputHookManager`, since creating that object automatically
          sets ``PyOS_InputHook``.