button1 = wx.Button(self, wx.ID_ANY, 'button1')
button1.Bind(wx.EVT_BUTTON, self.onButton1)
button2 = wx.Button(self, wx.ID_ANY, 'button2')
button2.Bind(wx.EVT_BUTTON, self.onButton2)
  
def onButton1(self, event) :
  print ("push Button1")
def onButton2(self, event) :
  print ("push Button2")

widgets は、name を与えることにより、区別できる。こちらのほうが個人的には、好みである。

button1 = wx.Button(self, wx.ID_ANY, 'button', name='button1')
button2 = wx.Button(self, wx.ID_ANY, 'button', name='button2')

# ボタンが押された event を panel などに Bindする。
self.Bind(wx.EVT_BUTTON, self.onButton)

def onButton(self, event) :
  buttonObject = event.GetEventObject()
  print ("push: ", buttonObject.GetName())

例

buttonEvent.py

import os
import sys
import wx
 
class TopPanel(wx.Panel) :
    def __init__(self, parent, *args, **kwargs) :
        wx.Panel.__init__(self, parent, wx.ID_ANY)
 
        button1 = wx.Button(self, wx.ID_ANY, 'button1', name='button1')
        button2 = wx.Button(self, wx.ID_ANY, 'button2', name='button2')        
        layout = wx.BoxSizer(wx.VERTICAL)
        layout.Add(button1, 1, flag=wx.EXPAND)
        layout.Add(button2, 1, flag=wx.EXPAND)        
        self.SetSizer(layout)
        self.Bind(wx.EVT_BUTTON, self.onButton) 
 
    def onButton(self, event) :
        buttonObject = event.GetEventObject()
        print ("push: ", buttonObject.GetName())
 
 
class MainFrame(wx.Frame) :
    def __init__(self) :
        super().__init__(None, title="exFrame")
 
        topPanel = TopPanel(self)
        layout = wx.BoxSizer(wx.VERTICAL)
        layout.Add(topPanel, 1, flag=wx.EXPAND)
        self.SetSizer(layout)
 
        self.SetSize(500,500)
        self.SetMinSize((100, 100))
        self.Center(wx.BOTH)
        self.Show()
 
def main() :
 
    app = wx.App()
    MainFrame()
    app.MainLoop()
    return
 
if __name__ == '__main__' :
    main()