Adding toolbar buttons

Next, we need to add 16 buttons to the left toolbar. Furthermore, depending on which button is clicked, different options would show up in the top bar as shown here:

We do not want our code structure to be too bloated by conditional logic to switch among these 16 functions. Therefore, we will call these methods dynamically.

We first begin by defining a tuple of all 16 function names (see code 6.01.py):

tool_bar_functions = (
 "draw_line", "draw_oval", "draw_rectangle", "draw_arc",
 "draw_triangle", "draw_star", "draw_irregular_line",
 "draw_super_shape", "draw_text", "delete_item",
 "fill_item", "duplicate_item", "move_to_top",
 "drag_item", "enlarge_item_size", "reduce_item_size"
 )

Doing so ensures that...