print matrix template and then in this printed matrix input numbers in python

To print a matrix template and then input numbers into it in Python, you can use nested loops. Here's an example:

main.py
# Define the dimensions of the matrix
rows = 3
cols = 3

# Create an empty matrix
matrix = []

# Generate the matrix template
for i in range(rows):
    row = []
    for j in range(cols):
        row.append(0)  # Change 0 to any initial value you want
    matrix.append(row)

# Print the matrix template
for row in matrix:
    print(row)

# Input numbers into the matrix template
for i in range(rows):
    for j in range(cols):
        matrix[i][j] = int(input(f"Enter element at position [{i}][{j}]: "))

# Print the matrix with the inputted numbers
for row in matrix:
    print(row)
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In this code, we first define the dimensions of the matrix (e.g. rows = 3 and cols = 3). Then, we create an empty matrix using nested loops. After that, we print the matrix template using another loop. Next, we use nested loops again to input numbers into the matrix by asking the user for input. Finally, we print the final matrix with the inputted numbers.

You can adjust the value of rows and cols to create a matrix of any size. Also, you can change the initial value inside the nested loop where the template is generated.

Note: This example assumes the user will input integer values. If you're expecting other types of input, you may need to add input validation or typecasting logic.