import wx
 
class RightPanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)
 
    def on_button(self, event):
        self.calculate()
 
    def calculate(self):
        # Another calculation here
        print 1+1
 
class LeftPanel(wx.Panel):
    def __init__(self, parent):
        wx.Panel.__init__(self, parent)
 
        # A Button
        self.button = wx.Button(self, -1, 'Calculate!')
 
        # If the button is pressed, call on_button on the other class
        self.Bind(wx.EVT_BUTTON, RightPanel.on_button, self.button)
 
class Frame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, -1, "Testing")
        self.left_panel = LeftPanel(self)
        self.right_panel = RightPanel(self)
 
        # Panel sizer
        self.panelsizer = wx.BoxSizer(wx.HORIZONTAL)
        self.panelsizer.Add(self.left_panel, 0, wx.LEFT | wx.TOP | wx.EXPAND)
        self.panelsizer.Add(self.right_panel, 1, wx.LEFT | wx.TOP | wx.EXPAND)
        self.SetSizer(self.panelsizer)
        self.panelsizer.Fit(self)
 
if __name__ == '__main__':
    app = wx.PySimpleApp()
    app.frame = Frame()
    app.frame.Show()
    app.MainLoop()