请教一下各位，关于abaqus的python二次开发命令PartitionCellByPlanePointNormal，发现对某一部件执行该命令（分割部件）的for循环中，固定选取一边作为法线方向，有的时候没有报错有的时候却出现报错，每次循环都要对该边进行重新定义对象变量才保证绝对不会报错，但是循环次数太多则会有效率问题，如何解决比较好。
我发现对一个立方体的三个方向进行10等份分割，尝试运行了下面三种代码都中途中断，不知是什么原因。

[code]m = mdb.Model(name='cube')
s = m.ConstrainedSketch(name='square',sheetSize=100.0)
s.Line(point1=(0.0,0.0),point2=(10.0,0.0))
s.Line(point1=(10.0,0.0),point2=(10.0,10.0))
s.Line(point1=(10.0,10.0),point2=(0.0,10.0))
s.Line(point1=(0.0,10.0),point2=(0.0,0.0))
p=m.Part(name='cube',dimensionality=THREE_D,type=DEFORMABLE_BODY)
p.BaseSolidExtrude(sketch=s,depth=10.0)
e1 = p.edges.findAt(((0.5,0.0,0.0),))
e2 = p.edges.findAt(((0.0,0.5,0.0),))
e3 = p.edges.findAt(((0.0,0.0,0.5),))
for i in range(1,10):
    p.PartitionCellByPlanePointNormal(point=(i,0,0),normal=e1[0],cells=p.cells)
    p.PartitionCellByPlanePointNormal(point=(0,i,0),normal=e2[0],cells=p.cells)
    p.PartitionCellByPlanePointNormal(point=(0,0,i),normal=e3[0],cells=p.cells)[/code]

[code]m = mdb.Model(name='cube')
s = m.ConstrainedSketch(name='square',sheetSize=100.0)
s.Line(point1=(0.0,0.0),point2=(10.0,0.0))
s.Line(point1=(10.0,0.0),point2=(10.0,10.0))
s.Line(point1=(10.0,10.0),point2=(0.0,10.0))
s.Line(point1=(0.0,10.0),point2=(0.0,0.0))
p=m.Part(name='cube',dimensionality=THREE_D,type=DEFORMABLE_BODY)
p.BaseSolidExtrude(sketch=s,depth=10.0)
for i in range(1,10):
    e1 = p.edges.findAt(((0.5,0.0,0.0),))
    e2 = p.edges.findAt(((0.0,0.5,0.0),))
    e3 = p.edges.findAt(((0.0,0.0,0.5),))
    p.PartitionCellByPlanePointNormal(point=(i,0,0),normal=e1[0],cells=p.cells)
    p.PartitionCellByPlanePointNormal(point=(0,i,0),normal=e2[0],cells=p.cells)
    p.PartitionCellByPlanePointNormal(point=(0,0,i),normal=e3[0],cells=p.cells)[/code]

[code]m = mdb.Model(name='cube1')
s = m.ConstrainedSketch(name='square',sheetSize=100.0)
s.Line(point1=(0.0,0.0),point2=(10.0,0.0))
s.Line(point1=(10.0,0.0),point2=(10.0,10.0))
s.Line(point1=(10.0,10.0),point2=(0.0,10.0))
s.Line(point1=(0.0,10.0),point2=(0.0,0.0))
p=m.Part(name='cube',dimensionality=THREE_D,type=DEFORMABLE_BODY)
p.BaseSolidExtrude(sketch=s,depth=10.0)
for i in range(1,10):
    e1 = p.edges.findAt(((i,0.0,0.0),))
    e2 = p.edges.findAt(((0.0,i,0.0),))
    e3 = p.edges.findAt(((0.0,0.0,i),))
    c1 = p.cells.findAt(((i,0.0,0.0),))
    c2 = p.cells.findAt(((0.0,i,0.0),))
    c3 = p.cells.findAt(((0.0,0.0,i),))    
    p.PartitionCellByPlanePointNormal(point=(i,0,0),normal=e1[0],cells=c1)
    p.PartitionCellByPlanePointNormal(point=(0,i,0),normal=e2[0],cells=c2)
    p.PartitionCellByPlanePointNormal(point=(0,0,i),normal=e3[0],cells=c3)[/code]