def is_square(matrix):
# Return True if the matrix is square (rows == columns).
return all(len(row) == len(matrix) for row in matrix)
matrix = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
print("The matrix is a square matrix." if is_square(matrix)
else "The matrix is not a square matrix.")
"""
run:
The matrix is a square matrix.
"""