请高手指点下我这个fish的loop while循环为什么是错的！谢谢
newgen zone brick p0 0 0 0 p1 10 0 0 p2 0 10 0 p3 0 0 10
def E_modify
y=2
loop while y>8
z=y
command
sel cable id=1 begin=(4,z,9.9) end=(3,z,11) nseg=13
sel cable id=2 begin=(6,z,9.9) end=(7,z,11) nseg=13
end_command
y=z+2
end_loop
end
E_modify
plot add surface red
plot show
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