Python Program to Find the Sum of Even Numbers from 1 to N
easyfor loopPython
A loop with an accumulator — a variable that collects a running total.
The question
Read an integer n and print the sum of all even numbers from 1 to n (both included).
The code
program.py
n = int(input())
total = 0
for i in range(2, n + 1, 2):
total += i
print("Sum =", total)Input
46
Output
Sum = 552
How it works
- 1Start total at 0.
- 2range(2, n + 1, 2) gives only even numbers: 2, 4, 6 … up to n.
- 3Add each one to total, then print the total after the loop.
Common mistakes
- Writing range(2, n, 2) — if n is even, n itself is left out.
- Putting print inside the loop, which prints every partial total.
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