code: def open_file_dialog(windowTitle, wildcard, defaultDir=os.getcwd(), style=None, parent=None):
      
  
      if parent == None:
          app = wx.App(None)
  
      if style == None:
          style = wx.OPEN | wx.CHANGE_DIR
  
      dialog = wx.FileDialog(parent, windowTitle, defaultDir=defaultDir, wildcard=wildcard,
                             style=style)
  
      if dialog.ShowModal() == wx.ID_OK:
          path = dialog.GetPath()
      else:
          path = None
      dialog.Destroy()
      return path
docs: Opens a wx widget file select dialog.
          Wild card specifies which kinds of files are allowed.
          Style - specifies style of dialog (read wx documentation for information)