def triangles():
l=[1]
while True:
yield l
#起始位补[0]
a = [0] + l
#注意选好range范围,这里选到len(a)-1,即从0到len(a)-2,不含len(a)-1,最后末尾补[1]
l = [a[i] + a[i + 1] for i in range(0, len(a) - 1)]+[1]
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YOUTH
def triangles():
l=[1]
while True:
yield l
#起始位补[0]
a = [0] + l
#注意选好range范围,这里选到len(a)-1,即从0到len(a)-2,不含len(a)-1,最后末尾补[1]
l = [a[i] + a[i + 1] for i in range(0, len(a) - 1)]+[1]