def listP(row, col):
if (row == col or col == 0):
return 1
else:
return listP(row - 1, col - 1) + listP(row - 1, col)
def yanghui():
n = 10
strL = ""
for i in range(0, n):
for j in range(0, i + 1):
strL += str(listP(i, j)) + "\t"
if i == j:
strL += "\n"
print(strL)