Python Exercise: N x N square consisting only of the integer N

Last update on April 17 2025 13:00:39 (UTC/GMT +8 hours)

NxN Square of Integer

Write a Python program that takes a positive integer and creates an N x N square filled with the integer N. Display the N x N square.

Sample Data:

(2) -> [[2, 2], [2, 2]]
(5) -> [[5, 5, 5, 5, 5], [5, 5, 5, 5, 5], [5, 5, 5, 5, 5], [5, 5, 5, 5, 5], [5, 5, 5, 5, 5]]
(-6) -> []

Sample Solution-1:

Python Code:

# Function to create a 2D list filled with the value N.
def test(N):
    # Initialize an empty list to store the rows.
    result = []
    
    # Iterate N times to create N rows.
    for i in range(N):
        # Append a row with N elements, each having the value N.
        result.append([N] * N)
    
    # Return the resulting 2D list.
    return result

# Take user input for the value of N.
N = int(input("Input an integer: "))

# Call the test function with the user-input value of N and print the result.
print(test(N))

Sample Output:

Input an integer :  4
[[4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4]]
Input an integer :  -4
[]

Explanation:

Here is a breakdown of the above Python code:

Function definition:

def test(N):: Defines a function named "test()" that takes an integer 'N' as input.

Initializing an empty list:
result = []: Initializes an empty list named 'result' to store the rows of the 2D list.

Loop to create rows:

for i in range(N):: Iterates 'N' times to create 'N' rows.

Appending rows:

result.append([N] * N): Appends a row to the 'result' list. Each row is a list with N elements, and each element has the value 'N'.

Return result:

return result: Returns the resulting 2D list.

User input:

N = int(input("Input an integer: ")): Takes user input for the value of 'N'.

Function Call and Print:

print(test(N)): Calls the "test()" function with the user-input value of 'N' and prints the resulting 2D list.

Flowchart:

Sample Solution-2:

Python Code:

# Function to create a 2D list filled with the value N.
def test(N):
    # Create a 2D list with N rows, where each row is a list with N elements, each having the value N.
    result = [[N] * N] * N
    
    # Return the resulting 2D list.
    return result

# Take user input for the value of N.
N = int(input("Input an integer: "))

# Call the test function with the user-input value of N and print the result.
print(test(N))

Sample Output:

Input an integer :  4
[[4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4], [4, 4, 4, 4]]

Explanation:

Here is a breakdown of the above Python code:

Function definition:

def test(N):: Defines a function named "test()" that takes an integer 'N' as input.

Creating a 2D List:

result = [[N] N] N: Creates a 2D list with 'N' rows. Each row is a list with 'N' elements, and each element has the value 'N'.

Note: This method of creating a 2D list using [...]*N can have unexpected behavior due to the way lists are referenced in Python. It creates references to the same inner list, leading to issues if you modify one row.

Return result:

return result: Returns the resulting 2D list.

User input:

N = int(input("Input an integer: ")): Takes user input for the value of 'N'.

Function call and print:

print(test(N)): Calls the "test()" function with the user-input value of 'N' and prints the resulting 2D list.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to create an N x N matrix filled with the integer N, handling edge cases for non-positive integers.
Write a Python program to generate a square matrix of size N where each element is the number N using list comprehension.
Write a Python program to construct and display an N by N grid populated entirely with the integer N.
Write a Python program to produce an N x N list of lists with all entries equal to N, returning an empty list for negative inputs.

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Next: Iterated Cube Root.

Python Code Editor:

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