杨辉三角

#-*- coding:utf-8 -*-
def triangles(n):
    list1=[1]
    list2=[1,1]
    yield list1
    yield list2
    temp=1
    now=3
    list1=list2
    list2=[1]
    while now <= n:
        while temp < now-1:
            list2.append(list1[temp]+list1[temp-1])
            temp=temp + 1
        list2.append(1)
        list1=list2
        now=now + 1
        yield list2
        list2=[1]
        temp=1

for list_temp in triangles(10):
    print(list_temp)