Python Program to Read a Number n and Print the Natural Numbers Summation Pattern

PythonServer Side ProgrammingProgramming

When it is required to read a number and print the pattern of summation of natural numbers, a simple ‘for’ loop can be used.

Below is a demonstration of the same −

Example

 Live Demo

my_num = int(input("Enter a number... "))
for j in range(1,my_num+1):
   my_list=[]
   for i in range(1,j+1):
      print(i,sep=" ",end=" ")
      if(i<j):
         print("+",sep=" ",end=" ")
      my_list.append(i)
   print("=",sum(my_list))

print()

Output

Enter a number... 5
1 = 1
1 + 2 = 3
1 + 2 + 3 = 6
1 + 2 + 3 + 4 = 10
1 + 2 + 3 + 4 + 5 = 15

Explanation

  • A number is taken as input from the user.

  • This number is iterated over.

  • An empty list is defined.

  • Another ‘for’ loop is initiated.

  • The separator is specified as ‘’.

  • If the value of inner iterator is less than value of outer iterator, the ‘+’ is used.

  • These values are appended to the empty list.

  • Their sum is computed and displayed as the output.

raja
Published on 16-Apr-2021 15:38:44
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