Ravindra BagaleCourses & study guides मराठी Track your progress

Python for Loops and while Loops Explained with Examples (range, break, continue)

P6.2 Python range() Function for Counting Loops

By , trainer LinkedIn Last updated:

Why. Sometimes you need numbers, not a list: days 1 to 30, months 1 to 12.

What. range(stop) gives 0 up to stop-1. range(start, stop) gives start up to stop-1. range(start, stop, step) jumps by step.

How.

Count with range

  1. Decide the first and last number.
  2. Add 1 to the last number (stop is not included).
  3. Use it in a for loop.

Worked example A — Count 1 to 5.

Step 1 — What we do. We print day numbers for a 5-day training.

Step 2 — Type and run this code.

for day in range(1, 6):
    print("Day", day)

Step 3 — Output you should see.

Day 1
Day 2
Day 3
Day 4
Day 5

Step 4 — What it means. range(1, 6) gives 1, 2, 3, 4, 5. The 6 is not included.

Worked example B — Grow savings each year.

Step 1 — What we do. A customer in Paris saves €1,000 at 5% interest for 3 years.

Step 2 — Type and run this code.

amount = 1000
for year in range(1, 4):
    amount = amount * 1.05
    print(f"Year {year}: €{amount:,.2f}")

Step 3 — Output you should see.

Year 1: €1,050.00
Year 2: €1,102.50
Year 3: €1,157.62

Step 4 — What it means. Each loop adds 5% to the new amount. This is compound interest, done by a loop.

Ravindra Bagale's Tip

Remember: the stop number is never included. range(1, 13) gives months 1 to 12.