OOP __init__ clarification

Newbie Help
1

I’m learning how to implement a Tree object. The code below works but I have a question about the line:

        wx.Frame.__init__(self, parent=None, title='TreeCtrl Demo')

Is this line creating a Frame? The init is confusing me as I’ve not seen that syntax before.

Thank you…

import wx
class MainFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, parent=None, title='TreeCtrl Demo')

        self.tree = wx.TreeCtrl(self, wx.ID_ANY, wx.DefaultPosition, wx.DefaultSize)
        self.root = self.tree.AddRoot('Root ')
        self.tree.AppendItem(self.root, 'Child')
        self.tree.Expand(self.root)
        self.Show()

if __name__ == '__main__':
    app = wx.App(redirect=False)
    frame = MainFrame()
    app.MainLoop()
2

This is a call to the __init__ method of the base class (wx.Frame). Your MainFrame class inherits from wx.Frame.
In python 3 you can use super:
super().__init__(parent=None, title='TreeCtrl Demo')

3

I see. Thank you for that.

I was also wondering with the file structure having the if name == ‘main’:, when we add other objects to the app such as buttons, labels, trees and toolbars, etc., do these get added above that main line or below it? The reason I ask is that I see code that has def functions declared below that Class block, left flush, so they are are not part of the Class.

4

in the Python docu there is, like in almost every good product, a section called FAQ and there under

How do I create static class data and static class methods?

is a somewhat comprehensive explanation… :partying_face: