Day 28 : Python program to print the natural numbers summation pattern

 

def print_summation_pattern(n):

    for i in range(1, n + 1):

        print("+".join([str(x) for x in range(1, i + 1)]))

n = int(input("Enter a number: "))

print_summation_pattern(n)

Code Explanation:

1. Function Definition

def print_summation_pattern(n):

    for i in range(1, n + 1):

        print("+".join([str(x) for x in range(1, i + 1)]))

Purpose:

The function generates and prints a pattern where each line contains a sequence of numbers from 1 to the current line number, separated by +.

Logic Breakdown:

Outer Loop (for i in range(1, n + 1)):

Iterates from 1 to n (inclusive).

Each iteration corresponds to one line in the pattern.

The variable i determines how many numbers will appear on the current line.

Generate Numbers for the Current Line:

[str(x) for x in range(1, i + 1)]

A list comprehension is used to create a list of numbers from 1 to i.

range(1, i + 1) generates numbers from 1 to i (inclusive).

Each number is converted to a string using str(x) for proper formatting with +.

Join Numbers with +:

"+".join([...])

The join method combines the strings in the list, using + as the separator.

Print the Result:

The formatted string is printed, displaying the numbers separated by +.

2. User Input and Function Call

n = int(input("Enter a number: "))

The user is prompted to enter an integer (n).

int(input(...)) converts the input string into an integer.

print_summation_pattern(n)

The print_summation_pattern function is called with n as the argument to generate and print the pattern.

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