On Mar 5, 3:03 am, Marc 'BlackJack' Rintsch <bj_...@gmx.net> wrote: > On Wed, 04 Mar 2009 09:04:50 -0800, chuck wrote: > > On Mar 3, 10:40 pm, Marc 'BlackJack' Rintsch <bj_...@gmx.net> wrote: > >> On Tue, 03 Mar 2009 18:06:56 -0800, chuck wrote: > >> > I am learning python right now. In the lesson on tkinter I see this > >> > piece of code > > >> > from Tkinter import * > > >> > class MyFrame(Frame): > >> > def __init__(self): > >> > Frame.__init__(self) > >> > self.grid() > > >> > My question is what does "self.grid()" do? I understand that the > >> > grid method registers widgets with the geometry manager and adds them > >> > to the frame > > >> Not "the frame" but the container widget that is the parent of the > >> widget on which you call `grid()`. In this case that would be a (maybe > >> implicitly created) `Tkinter.Tk` instance, because there is no explicit > >> parent widget set here. Which IMHO is not a good idea. > > >> And widgets that layout themselves in the `__init__()` are a code smell > >> too. No standard widget does this, and it takes away the flexibility > >> of the code using that widget to decide how and where it should be > >> placed. > > > I think I understand what you're saying! How would you recommend I go > > about this? How do I create an explicit parent? > > You create it and pass it as argument to child widgets. > > import Tkinter as tk > > class MyFrame(tk.Frame): > def __init__(self, parent): > tk.Frame.__init__(self, parent) > > > What exactly is meant by "widgets that layout themselves"- what is the > > right way to do this? > > Call one of the three layout methods on the widget instance after you > created it, and not in the `__init__()` of the widget. > > Your example above "grids" itself at its parent widget, I think at the > next free cell on a grid if you don't give the position as argument. > There is no chance to use another layout manager or to place it in > another cell. > > Ciao, > Marc 'BlackJack' Rintsch
Wow- lots of good answers and directions- let me go off and digest this. Thanks Marc and "r". -- http://mail.python.org/mailman/listinfo/python-list
