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Write a Python Program to Find the Sum of n Natural Positive Numbers Tutorial For Beginners
Jun 1, 2025
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uh hello guys welcome to this video so
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in this video I will show you how to
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write a Python program which calculates
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the sum of uh uh natural numbers you can
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actually give it a range here I want the
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sum of all the natural numbers up to
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this range and this then this Python
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program will calculate the sum and
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return to you this is a very common
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question asked inside interviews and
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competitive exams as well so let me show
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you the output first of
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all as I execute this program right here
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it will ask you to enter a positive
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number up to which so now let's suppose
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I want all the sum of all positive
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natural numbers up to 10 so now you can
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see sum of natural numbers up to 10 is
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55 so how it calculates it calculates
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like this 1 + 2 +
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3
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+ 4 + 5 + 6 + 7 very simple
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program how many numbers you write it
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basically manually calculates the sum so
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1 2 3 6 10 15 21 28 28 +
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8 36 36 + 10 46 46 + 9 uh 46 55 so this
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is your sum here 55 if I say let's
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suppose I want all the sum of positive
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numbers up to three so this will be 1 +
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2 + 3 which is 6 so you will see so let
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me now show the actual program right
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here it's very simple let me show you
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step by step using this famous tool
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which is Python tutor which will execute
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program step by step so here the very
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first step we are asking the user to
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enter a positive number so we let me
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write five so I want the sum of all the
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positive numbers up till five as I
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submit you will
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see it will register a global
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variable number will be initialized to
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five and then for this program guys we
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need an additional variable to store the
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sum of numbers so we are declaring this
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global variable sum is equal to zero at
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the starting so we have this variable
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sum is declared to zero now we are
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having this for loop here we are looping
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through all the numbers that the user
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has written up till five so now the loop
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will start from 1 up till
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5 so that's why we are using this for
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loop for i in range 1 comma number is 5
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+ 1 which is 6 so 6 is not included it
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will run until five and after it reaches
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six it will break so essentially it is
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running from 1 to 5 and inside this for
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loop we are
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simply just storing the sum here so sum
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whatever is the sum is equal to sum
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plus what is the number here so 1 then 2
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3 4 5 so the first step I is equal to 1
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here you will see I is 1 so now the sum
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will be 1 + 0 which will comes out to be
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1 now sum will become 1 now it will run
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for the second time now the i value will
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become two so 2 +
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1 which will be three so now this will
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be three so now again i value will
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increase to three so 3 + 3 is
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6 so now I will become four
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so 4 + 6 is 10 as you can see and then I
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will become 5 so 5 + 10 comes out to be
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15 and as soon as I reaches six the loop
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will break and then it will print out
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sum of natural numbers up to five is 15
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so this is a very simple approach by
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which you can solve this problem in
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Python very simple program as you can
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see
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please hit that like button subscribe
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the channel guys and also check out my
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website freemediattools.com
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uh which contains thousands of tools
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