ABAQUS二次开发问题

三石123

大家帮帮忙，有个关于ABAQUS二次开发的问题
想用Python程序对ABAQUS计算结果odb文件进行后处理，输出某些节点的应力
具体的程序
from odbAccess import *
from abaqusConstants import *

odb = openOdb(path='SA_3kN.odb')
step2 = odb.steps['Step-7']
fra = step2.frames
region = step2.historyRegions['Node PART-1-1.550530']
f=region.fieldOutput['CPRESS'].data
dispFile=open('fy-4000-10.txt','w')
for time,fDisp in f:
    dispFile.write('%10.4E %10.4E\n'%(time,fDisp))
dispFile.close()