Building the button grid

Instead of writing 16 buttons by hand, store the labels in a list of rows and make the buttons in a loop.

Key points

Nested loops for rows and columns
lambda passes each button its own label
Fewer lines, fewer bugs

rows = ["789/", "456*", "123-", "0.=+"]
for r, row in enumerate(rows, start=1):
    for c, ch in enumerate(row):
        tk.Button(root, text=ch, font=("Arial", 18),
                  command=lambda ch=ch: press(ch)).grid(row=r, column=c, sticky="nsew")

Your turn

Build the full button grid with the loop.

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Quiz · +10 XP

Building the button grid

Key points

Why write lambda ch=ch: press(ch) instead of lambda: press(ch)?