# Sum of n numbers using while loop in Python | Example code

Simple use if statement with a while loop to calculate the Sum of n numbers in Python. Taken a number input from the user and stored it in a variable num.

Use a while loop to iterate until num gets zero. In every iteration, add the num to sum, and the value of num is decreased by 1.

## Example sum of n numbers using while loop in Python

Simple example code sum of natural numbers up to num.

``````num = 15
sum = 0

# use while loop to iterate until zero
while num > 0:
sum += num
num -= 1
print("The sum is", sum)
``````

Output:

User input number sum

``````sum = 0

num = int(input("Enter a number: "))
if num < 0:
else:
sum = 0

# use while loop to iterate until zero
while num > 0:
sum += num
num -= 1
print("The sum is", sum)
``````

Output:

Enter a number: 10
The sum is 55

Do comment if you have any doubts or suggestions on this Python sum topic.

Note: IDE: PyCharm 2021.3.3 (Community Edition)

Windows 10

Python 3.10.1

All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.

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