Trying to test buttons of a GUI

testing_GUI.py

import wx

class Form1(wx.Panel):
    def __init__(self, parent, id):
        wx.Panel.__init__(self, parent, id)
        
        self.button =wx.Button(self, 10, "MULTIPLICA", wx.Point(20,10))
        wx.EVT_BUTTON(self, 10, self.OnClick)
        
        self.button =wx.Button(self, 20, "SOMA", wx.Point(20,100))
        wx.EVT_BUTTON(self, 20, self.OnClick)        
          
    def OnClick(self, event):
            
        if event.GetId()==10: #Run import
            a = 10
            b = 20
            multiplica = a*b
            print multiplica
            
        if event.GetId()==20: #Run import
            a = 10
            b = 20
            soma = a+b
            print soma

if __name__ == "__main__":
        
    app = wx.PySimpleApp()
    frame = wx.Frame(None, -1, "test GUI", pos=(0,0), size=(200,200))
    Form1(frame,-1)
    frame.Show(1)
    
    app.MainLoop()