forrangesofNnum.py

# print sum of first n numbers
n=int(input('enter a number:'))  # n = 5
sum=0
for num in range(1,n+1):
    sum+=num 
print(sum)

'''
Step 1: Initialize variables
User inputs n=5
Initialize sum = 0 to accumulate the total

Step 2: The for loop begins iterating over the range from 1 to n+1
i.e., 1 to 6 (exclusive of 6)

Step 3: First iteration (num = 1)
Add num (1) to sum
sum = 0 + 1 = 1

Step 4: Second iteration (num = 2)
Add num (2) to sum
sum = 1 + 2 = 3

Step 5: Third iteration (num = 3)
Add num (3) to sum
sum = 3 + 3 = 6

Step 6: Fourth iteration (num = 4)
Add num (4) to sum
sum = 6 + 4 = 10

Step 7: Fifth iteration (num = 5)
Add num (5) to sum
sum = 10 + 5 = 15

Step 8: The loop ends as all values from 1 to 5 have been processed
Step 9: Print the final value of sum, which is 15
'''