a ,n = [1],1
while True:
yield a
b = [1]
for x in range(n-1):
b.append(a[x]+a[x+1])
b.append(1)
a,n=b,n+1
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吃不瘦的胖子201811
a ,n = [1],1
while True:
yield a
b = [1]
for x in range(n-1):
b.append(a[x]+a[x+1])
b.append(1)
a,n=b,n+1