Dear Friends, I am looking for some advice about how to write a loop in Python for selecting some selecting specific element activation or deactivation (or unit element selection ) from region in correspond to specific step in Abaqus.  to be short Python script for first generate number of step , then has to select corresponding element from mesh. there is picture in attachment shown below, which has element label on it from 1 to 196 per say. the script has to generate first ,number of step, which is working, then in the second step has to have another loop for selecting elements one by one. or example, at first step has to select element number 1 to activate or deactivate it, then in corresponding to second step, it has to select element number 2 to activate or deactivate it, the has to continue till the end step. your help is very much appreciated. thanks

Python script:

from part import *
from material import *
from section import *
from assembly import *
from step import *
from interaction import *
from load import *
from mesh import *
from optimization import *
from job import *
from sketch import *
from visualization import *
from connectorBehavior import *

Tol=0.000000001
Speed=0.01
##Pass1
for i in range(2,196) :
mdb.models['Job-1'].HeatTransferStep(deltmx=500,initialInc=0.05,maxInc=0.2,
maxNumInc=1000000,minInc=1e-11,name='Welding-'+str(i),previous='Welding-'+str(i-1))

##activation
for i in range(1,195):
mdb.models['Job-1'].ModelChange(activeInStep=True, createStepName='Welding-'+str(i),
includeStrain=False,name='Welding-'+str(i),region=Region(elements=mdb.models['Job-1'].rootAssembly.instances['Part-1-1'].elements.getByBoundingBox(
-Tol+Speed*(i-1),-(0.0075+Tol),-(0.005+Tol),Tol+Speed*i,0.0075+Tol,Tol)), regionType=ELEMENTS)

Best regards

Adili