Pascal triangle generator in Python

pascal.py

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

col = 0
row = 0
line = []
totallines = 0

while totallines < 20:
	line.append(pascal(col, row))
	if row == col:
		row += 1
		col = 0
		print " ".join([str(i) for i in line])
		line = []
		totallines += 1
	else:
		col += 1