#题目:打印出杨辉三角形(要求打印出10行如下图)。
 #!/usr/bin/python3
def Pascal(n):
 ls = [[1]]
 for i in range (1, n):
 ls.append([1])
 for j in range(1, i):
 ls[i].append(ls[i-1][j-1] + ls[i-1][j])
 ls[i].append(1)
 for i in range(0, n): print(ls[i])
 return ls
a = Pascal(10)
