wxPython - 具有相同名称的小部件？

Question

Why does the following code create 2 widgets, and not overwrite each other? How would someone reference the first instance vs second instance?

import wx

app = wx.App(False)
frame = wx.Frame(None, -1, "Test", (250,250), (250,250))
panel = wx.Panel(frame, -1)

textbox = wx.TextCtrl(panel, -1, "", (10,10), (135,20))
textbox = wx.TextCtrl(panel, -1, "", (10,40), (135,20))

frame.Show()
app.MainLoop()

Answer 1

The widgets are created, then assigned to the name. The first one still exists, but it is difficult for you to access it as you have assigned a different object to the name. If you want to still access both of them, try:

textboxes = []
textboxes.append(wx.TextCtrl(panel, -1, "", (10,10), (135,20)))
textboxes.append(wx.TextCtrl(panel, -1, "", (10,40), (135,20)))

Now you can access each by index:

textboxes[0]

Or loop through all of them:

for textbox in textboxes:

Answer 2

There is another reference to your TextCtrl objects so it is no deleted as you would expect. Your panel holds a list of all its children. To delete wxPython widget, you have to explicitly call its Destroy() method. So in your case it would be:

textbox = wx.TextCtrl(panel, -1, "", (10,10), (135,20))
textbox.Destroy()
textbox = wx.TextCtrl(panel, -1, "", (10,40), (135,20))

To be able to access both objects, you either have to do as @jonrsharpe suggests or you can use GetChildren() method. However holding references to all your widgets in your application yourself is preferred method.