Pythonize new code snippets in the docs

docs/sphinx/rest_substitutions/snippets/python/converted/wx.FileDialogCustomizeHook.1.py

@@ -0,0 +1,54 @@
+
+    class EncryptHook(wx.FileDialogCustomizeHook):
+
+        def __init__(self):
+            super().__init__()
+            self.encrypt = False
+
+        # Override to add custom controls using the provided customizer object.
+        def AddCustomControls(self, customizer):
+
+            # Suppose we can encrypt files when saving them.
+            self.checkbox = customizer.AddCheckBox("Encrypt")
+
+            # While self.checkbox is not really a wx.CheckBox, it looks almost like one
+            # and, in particular, we can bind to custom control events as usual.
+            self.checkbox.Bind(wx.EVT_CHECKBOX, self.OnCheckbox)
+
+            # The encryption parameters can be edited in a dedicated dialog.
+            self.button = customizer.AddButton("Parameters...")
+            self.button.Bind(wx.EVT_BUTTON, self.OnButton)
+
+        def OnCheckbox(self, event):
+            self.button.Enable(event.IsChecked())
+
+        def OnButton(self, event):
+            ... show the encryption parameters dialog here ...
+
+
+        # Override this to save the values of the custom controls.
+        def TransferDataFromCustomControls(self):
+            # Save the checkbox value, as we won't be able to use it any more
+            # once this function returns.
+            self.encrypt = self.checkbox.GetValue()
+
+    ...
+
+    def SomeOtherEventHandlerFunc(self, event):
+
+        dialog = wx.FileDialog(None, "Save document", "", "file.my",
+                    "My files (*.my)|*.my", wx.FD_SAVE | wx.FD_OVERWRITE_PROMPT)
+
+        # This object may be destroyed before the dialog, but must remain alive
+        # until ShowModal() returns. So you should hold a separate reference to
+        # it.
+        customizeHook = EncryptHook()
+        dialog.SetCustomizeHook(customizeHook)
+
+        if dialog.ShowModal() == wx.ID_OK:
+            if (customizeHook.encrypt)
+                ... save with encryption ...
+            else:
+                ... save without encryption ...
+
+        dialog.Destroy()

docs/sphinx/rest_substitutions/snippets/python/converted/wx.ToolBar.SetToolBitmapSize.1.py

@@ -0,0 +1,5 @@
+
+    toolbar.SetToolBitmapSize(self.FromDIP(wx.Size(32, 32)))
+    toolbar.AddTool(wx.ID_NEW, "New", wx.BitmapBundle.FromXXX(...))
+    ...
+    toolbar.Realize()