Question

How to calculate the sum of first N natural numbers in Python

Answer 1

# 1 + 2 + 3 + 4 + ... + N

n = 10
summ = 0

while n > 0:
    summ += n
    n -= 1

print("The sum is:", summ)

'''
run:

The sum is: 55

'''

 

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Answer 2

# 1 + 2 + 3 + 4 + ... + N

n = 10
summ = 0

summ = n / 2 * (n + 1)

print("The sum is:", summ)

'''
run:

The sum is: 55.0

'''

 

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