code: def OnInit(self):
      self.frame1 = FourierDemoFrame(
          parent=None, title="Fourier Demo", size=(640, 480)
      )
      self.frame1.Show()
      return True
  
imports: import wx
  import numpy
  from matplotlib.backends.backend_wxagg import FigureCanvasWxAgg
  from matplotlib.figure import Figure
label_desc: Use image node_id 1 for calling the App obj's underlying member method code with example usage: obj.OnInit() and returns: True