 | A widget has a parent widget |
| A widget must be packed (placed in the parent widget) before it can appear visually |
| Typical structure:
widget = Tk_class(parent_widget,
arg1=value1, arg2=value2)
widget.pack(side='left')
|
| Variables can be tied to the contents of, e.g., text entries, but only special Tkinter variables are legal: StringVar, DoubleVar, IntVar |
