Input and Output Checkpoint

Optional

20 min · Beginner

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A review of this module. Skip it if you feel confident; the next module does not need it.

Fix the mistakes

The slips that cost marks in this module. Spot each one, then check the fix.

Consolidate your input and output skills by creating clean, professional terminal receipts and formatted outputs.

Formatting tabular receipts

Using width specifiers in f-strings lets you create aligned tables and receipts on the command line.

Python

print(f"{'Item':<15} {'Qty':>5} {'Price':>10}")print("-" * 32)print(f"{'Keyboard':<15} {2:>5} {'$120.00':>10}")

Example 1 · Tax invoice

Python

1customer = "Rajesh"2price = 14500.03gst = price * 0.184total = price + gst5print(f"Customer: {customer}")6print(f"Subtotal: Rs. {price:,.2f}")7print(f"GST (18%): Rs. {gst:,.2f}")8print(f"Total: Rs. {total:,.2f}")

Output

Customer: Rajesh
Subtotal: Rs. 14,500.00
GST (18%): Rs. 2,610.00
Total: Rs. 17,110.00

What this code does

Calculates the 18% GST and the total bill.
Uses , and .2f for professional currency formatting.

The <15 aligns text left with 15 characters width, while >5 and >10 align numbers neatly to the right.

Dynamic separators in logs

Combine timestamps and logs cleanly using sep and end without clumsy concatenation.

Python

print("[INFO]", "Server started on port", 8000, sep=" | ")

Example 2 · A log line with sep and end

Python

print("[INFO]", "Server started on port", 8000, sep=" | ")print("Checking", end="... ")print("ready")

Output

[INFO] | Server started on port | 8000
Checking... ready

What this code does

sep places a bar between the three values.
end="... " keeps the next print on the same line.

Example 3 · Receipt from typed answers

Python

1item = input("Item: ")2qty = int(input("Qty: "))3price = float(input("Price: "))4print(f"{'Item':<12}{'Qty':>5}{'Amount':>12}")5print("-" * 29)6print(f"{item:<12}{qty:>5}{qty * price:>12,.2f}")

Output

Item: Monitor
Qty: 2
Price: 6499.5
Item          Qty      Amount
-----------------------------
Monitor         2   12,999.00

What this code does

input() text is converted with int() and float() before the multiplication.
The same widths in the header and the row keep the columns aligned.

The output prints [INFO] | Server started on port | 8000.

Finish up

Mark complete & continue

Next: The if and if-else Statements

1customer = "Rajesh"2price = 14500.03gst = price * 0.184total = price + gst5print(f"Customer: {customer}")6print(f"Subtotal: Rs. {price:,.2f}")7print(f"GST (18%): Rs. {gst:,.2f}")8print(f"Total: Rs. {total:,.2f}")