Python, How to invoke an instance method from inside a another Class -

i have python gui frame has 1 upperpanel , vertical splitterwindow. each panel in splitterwindow created 2 panel classes, 1 listbox , other 1 grid. each class has several buttons.

is there way keep button connect event.bind , function code inside class , make work, because, presently i'm getting following error:

attributeerror: 'panel' object has no attribute 'm_dirpicker1' 

i know best practice in reported situation.

this example short example of have wrote:

class frame ( wx.frame ):     ...     self.m_datapanel = wx.panel( self, wx.id_any, wx.defaultposition, wx.defaultsize, wx.tab_traversal )     self.m_filespanel = source_panel( self.m_splitter1)     self.m_gridpanel = data_viewer( self.m_splitter1)  class source_panel ( wx.panel ):     ...          # connect events         self.m_listbox.bind( wx.evt_listbox_dclick, self.m_listboxonlistboxdclick )         self.m_clearbutton.bind( wx.evt_button, self.m_clearbuttononbuttonclick )         self.m_importbutton.bind( wx.evt_button, self.m_importbuttononbuttonclick )         self.m_showdata.bind( wx.evt_button, self.m_showdataonbuttonclick )      def __del__( self ):         pass      # virtual event handlers, overide them in derived class     def m_listboxonlistboxdclick( self, event ):         event.skip()      def m_clearbuttononbuttonclick( self, event ):         event.skip()      def m_importbuttononbuttonclick( self, event ):         src_directory = frame.m_datapanel.m_dirpicker1.gettextctrlvalue()      def m_showdataonbuttonclick( self, event ):         event.skip()   class data_viewer ( wx.panel ):     ... 

i'm going assume source_panel instance child of myframe instance (i'm going refer frame myframe avoid confusion wx.frame base class).

in case, parent attribute of source_panel instance should refer parent myframe.

then can call:

self.parent.m_datapanel.m_dirpicker1.gettextctrlvalue()