Python 3 function that can be used to calculate the determinant of any n x n matrix

determinant.py

def det(m):
    """Returns the determinant for the n x n matrix m"""
    # If the matrix is 2x2, then we just calculate the determinant
    # simply otherwise we will use Laplace Expansion
    if len(m) == 2:
        return (m[0][0] * m[1][1]) - (m[1][0] * m[0][1])
    else:
        d = 0
        for i in range(len(m)):
            new_m = [x[0:i] + x[i+1:] for x in m[1:]]
            d += (-1)**i * det(new_m)
        return d