Operating system: Windows 10 64bit ver 20H2
wxPython version & source: 4.1.1 (pypi)
Python version & source: 3.8.6
Description of the problem:
In the sample code, the button object only binds and unbinds the two handlers. If the unbinding order is reversed, the program will crash. I also checked it with wx.version 4.0.7, and there was no problem.
Code Example (click to expand)
import wx
class TestPanel(wx.Panel):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.btn = wx.Button(self, label="Hello, wxPython!")
self.btn.Bind(wx.EVT_BUTTON, self.onButton1)
self.btn.Bind(wx.EVT_BUTTON, self.onButton2)
if 0:
## no problem
self.btn.Unbind(wx.EVT_BUTTON, handler=self.onButton2)
self.btn.Unbind(wx.EVT_BUTTON, handler=self.onButton1)
else:
## eversing the unbind order will break the linkage of the event chain
self.btn.Unbind(wx.EVT_BUTTON, handler=self.onButton1)
self.btn.Unbind(wx.EVT_BUTTON, handler=self.onButton2)
def onButton1(self, evt):
print(1)
evt.Skip()
def onButton2(self, evt):
print(2)
evt.Skip()
app = wx.App()
frm = wx.Frame(None)
frm.panel = TestPanel(frm)
frm.Show()
app.MainLoop() 
Operating system: Windows 10 64bit ver 20H2
wxPython version & source: 4.1.1 (pypi)
Python version & source: 3.8.6
Description of the problem:
In the sample code, the button object only binds and unbinds the two handlers. If the unbinding order is reversed, the program will crash. I also checked it with wx.version 4.0.7, and there was no problem.
Code Example (click to expand)