##############################################################
## Extract EigenValues from Linear Buckling Analysis
## https://anning003.com/extract-eigenvalues/
##############################################################

stepName = 'Name of Buckling Step'

from odbAccess import*
from abaqusConstants import*
import string
import numpy as np
import os
import re

odb = openOdb(path = jobName+'.odb')

outfile = open(jobName + '.csv', 'w')
outfile.write('EigenValue'+ '\n')

for fm in range(1, len(odb.steps[stepName].frames)):

  text = odb.steps[stepName].frames[fm].description
  EigenValue = [float(i) for i in re.findall("\\d+\\.\\d+", text)]
  outfile.write(str(EigenValue[0]) + '\n')

outfile.close()

odb.close()