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

Python Basic - 1: Exercise-149 with Solution

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:

Python Code Editor:

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