matrixRowColumnSwap

def matrixRowColumnSwap(matrix,k):
#@param:
#   matrix: matrix;
#   k: int;
    assert matCheck(matrix), "Matrix is not square."
    assert k<=len(matrix) and k>=0, "Parameter is smaller than 0 or is bigger than matrix size"
    for i in range(0,len(matrix)):
        item1 = matrix[k][i]
        item2 = matrix[i][k]
        matrix[k][i] = item2
        matrix[i][k] = item1

def matCheck(matrix):
#@param:
#   matrix: matrix;
#   return: bool;
    lenght = len(matrix)
    for i in range(0,lenght):
        if len(matrix[i]) != lenght:
            return False
    return True