Update button.py

Adds buttons to a list

Author: self-init

calculator/gui/button.py

@@ -15,19 +15,21 @@ class CalculatorButtons:
     def __init__(self, calculator: calc.Calculator):
         self.calculator = calculator
         self.frame = None
+        self.buttons = []
 
     def create_gui(self, root, layout=LAYOUT_STANDARD, width=4):
         self.frame = tk.Frame(root)
 
         for i, label in enumerate(layout):
             button = calc_button(self.frame, self.calculator, label)
             button.grid(column=i%width, row=int(i/width), sticky=tk.NSEW)
+            self.buttons.append(button)
 
         for i in range(width):
             self.frame.grid_columnconfigure(i, uniform="calc_buttons", weight=1)
 
         for i in range(int(len(layout)/width)):
             self.frame.grid_rowconfigure(i, weight=1)
-    
+
     def update(self):
         pass