Python生成器实现杨辉三角打印

 def triangles():
     c = [1]
     while 1:
         yield c
         a,b=[0]+c,c+[0]
         c=[a[i]+b[i] for i in range(len(a))]

 n = 0
 for t in triangles():
     print(t)
     n = n + 1
     if n == 10:
         break