In this Python program, we will learn how to find the sum of the natural numbers. Natural numbers are the positive integers or non-negative integers that start from 1 and end at infinity, such as 1,2,3,4,5,6,7,8,9,10,……,∞.

Here is the code of the program to find the sum of the natural numbers.

```
# Python Program to Find the Sum of Natural Numbers
# Sum of natural numbers up to num
# Take the Input From the User
num = int(input("Enter the Number: "))
holdNum = num
if num < 0:
print("Enter a positive number")
else:
sum = 0
# use while loop to iterate until zero
while(num > 0):
sum += num
num -= 1
print("The Sum of First",holdNum,"Natural Number is: ", sum)
```

Enter the Number: 10

The Sum of First 10 Natural Number is: 55

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