tkinter Tkinter Geometry Managers pack()
Example
The pack() geometry manager organizes widgets in blocks before placing them in the parent widget. It uses the options fill, expand and side.
Syntax
widget.pack(option)
Fill
Determines if the widget keeps the minimal space needed or takes up any extra space allocated to it. Attributes: NONE (default), X (fill horizontally), Y (fill vertically), or BOTH (fill both horizontally and vertically).
Expand
When set to YES, the widget expands to fill any space not used in widget's parent. Attributes: YES, NO.
Side
Determines which side of the widget's parent it packs to. Attributes: TOP (default), BOTTOM, LEFT, or RIGHT.
Example
from tkinter import *
root = Tk()
btn_fill = Button(root, text="Button")
btn_fill.pack(fill=X)
btn_expand = Button(root, text="Button")
btn_expand.pack(expand=YES)
btn_side = Button(root, text="Button")
btn_side.pack(side=RIGHT)
root.mainloop()
Result
