Exercise 8: An Inventory Table — Possible Solution
====================================================================

stock = {
    "Widget": (120, 2.5),
    "Sprocket (large)": (8, 14.75),
    "Bolt": (5400, 0.05),
}

width = max(len(name) for name in stock)
print(f"{'Item':<{width}}  {'Qty':>7}  {'Price':>8}  {'Value':>10}")
print("-" * (width + 31))

grand_total = 0
for name, (qty, price) in stock.items():
    value = qty * price
    grand_total += value
    print(f"{name:<{width}}  {qty:>7,}  £{price:>7.2f}  £{value:>9,.2f}")

print("-" * (width + 31))
print(f"{'Total':<{width}}  {'':>7}  {'':>8}  £{grand_total:>9,.2f}")

Output:
Item                  Qty     Price       Value
-----------------------------------------------
Widget                120  £   2.50  £   300.00
Sprocket (large)        8  £  14.75  £   118.00
Bolt                5,400  £   0.05  £   270.00
-----------------------------------------------
Total                                £   688.00

WHY THIS WORKS AS AN ANSWER
------------------------------
width is calculated from the data, so the table fits the longest
name and nothing is hard-coded. {name:<{width}} nests one pair of
braces inside the format spec, which is how a variable supplies the
width. The separator line is width + 31 because the three number
columns are 7, 8 and 10 characters wide and each is preceded by a
2-space gap: 2 + 7 + 2 + 8 + 2 + 10 = 31. {qty:>7,} right-aligns and
adds thousands separators, and the pound sign sits in the literal
text, with the numbers formatted inside the 8- and 10-character
fields. The for target name, (qty, price) unpacks each value tuple
on the way in.