Tkinter网格布局小部件不在父级中

Question

I am building a GUI in Python with Tkinter however I am having issues with the Grid layout. Am I right in assuming that if you specify a parent, that child then sits at the grid position you specify in that parent? Here is my example:

layout_frame = tk.Frame(master, bg="red").grid(row=1, column=2, rowspan=9, sticky=tk.N+tk.S+tk.W+tk.E)
inner_frame = tk.Frame(master=layout_frame, bg="red").grid(row=0, column=0, rowspan=9, sticky=tk.N+tk.S+tk.W+tk.E)

My problem is that inner_frame is sitting at grid position (0,0) in master, and not in layout_frame . Why is it not sitting at position (0,0) in it's specified parent?

Thanks

Answer 1

layout_frame is the result of the call to grid (which is None and not the frame you have just created). When the parent of a widget is None, Tkinter sets the parent as the root element, so you have to create the frame first and call grid in a separate statement.

layout_frame = tk.Frame(master, bg="red")
layout_frame.grid(row=1, column=2, rowspan=9, sticky=tk.N+tk.S+tk.W+tk.E)
inner_frame = tk.Frame(master=layout_frame, bg="red")
inner_frame.grid(row=0, column=0, rowspan=9, sticky=tk.N+tk.S+tk.W+tk.E)