Pascal triangule using recursion

pascal.py

def print_pascal_triangle(n_lines):
    for row in xrange(n_lines):
        for col in xrange(row + 1):
            print pascal(row, col),
        print


def pascal(row, col):
    if row == 0 or col == 0 or row == col:
        return 1
    else:
        return pascal(row - 1, col) + pascal(row - 1, col - 1)


print_pascal_triangle(5)
# 1
# 1 1
# 1 2 1
# 1 3 3 1
# 1 4 6 4 1