Last iteration of a loop

[Pierre-LucBoivin]

Hi,

I would like to get the last iteration of a loop and do a calculate field on it ! I've try to catch the last iteration with this

if index !=len(fclist)-1:   or   if index ==len(fclist)-1:

But still not having a good result

Any suggestions ?

for index, value in enumerate(fclist, start=1):         looptime = time.asctime()         print "Début de la boucle d'intersection en batch:" + looptime         print value                # Intersection                arcpy.Intersect_analysis([IntersectBoucle,value],OutIntersectBoucle)                   print "#### " + str(i) + "ieme intersection(Boucle) ###########"         print "L'intersection est entre : " + str(OutIntersectBoucle)+ " et " + str(value)         fieldnames4 = [f.name for f in arcpy.ListFields(OutIntersectBoucle)]                   # Populate field isSame, Supported and Supporting         arcpy.CalculateField_management(OutIntersectBoucle,"isSame","isSame( !Name!, !Name_1! )","Python_9.3",codeblock)         arcpy.CalculateField_management(OutIntersectBoucle,"Supported","PeuplerZone ( !isSame!, !Name!)","Python_9.3",codeblock2)         arcpy.CalculateField_management(OutIntersectBoucle,"Supporting","PeuplerZone ( !isSame!, !Name_1!)","Python_9.3",codeblock3)               j += 1                           if index !=len(fclist)-1:                 print "La dernière intersection est :" + str(OutIntersectBoucle) +  " + 1"                 arcpy.CalculateField_management(OutIntersectBoucle,"isSame","poly_exc( !isSame!)","Python_9.3",codeblock4)

Thanks

[MichaelVolz]

Are you sure

if index ==len(fclist)-1:

does not work?

This is syntax that I use in my own python script and it captures the last iteration of a loop.

Maybe it is other code that is the problem.

[MathewCoyle]

It is because you start your enumerate at 1.

for index, value in enumerate(fclist, start=1):

This means if len(fclist) == 5 then your index will also be 5 at the last iteration whereas with this

if index == len(fclist)-1:

You are capturing the second to last iteration.

Why is this even necessary? You can put your code outside your loop and carry over the values from the last iteration.

[MichaelVolz]

Why is this even necessary? You can put your code outside your loop and carry over the values from the last iteration.

Thanks mzcoyle. With this hint I can cleanup some of my extraneous coding.

[Pierre-LucBoivin]

Hi Mathew,

You're right that exactly what was happening I was catching the penultimate element.

Actually, I would like to include it in my loop if it's possible because I have a others operation after updating the last iteration.

i = 1
  
    for index, value in enumerate(fclist, start=1):
        looptime = time.asctime()
        print "Début de la boucle d'intersection en batch:" + looptime
        print value
   
         
         
        # Intersection       
        #arcpy.Intersect_analysis([IntersectBoucle,fclistBoucle],OutIntersectBoucle)
        arcpy.Intersect_analysis([IntersectBoucle,value],OutIntersectBoucle)
         
        print "#### " + str(i) + "ieme intersection(Boucle) ###########"
        print "L'intersection est entre : " + str(OutIntersectBoucle)+ " et " + str(value)
        fieldnames4 = [f.name for f in arcpy.ListFields(OutIntersectBoucle)]
         
        # Peupler les champs isSame, Supported and Supporting
        # Populate field isSame, Supported and Supporting
        arcpy.CalculateField_management(OutIntersectBoucle,"isSame","isSame( !Name!, !Name_1! )","Python_9.3",codeblock)
        arcpy.CalculateField_management(OutIntersectBoucle,"Supported","PeuplerZone ( !isSame!, !Name!)","Python_9.3",codeblock2)
        arcpy.CalculateField_management(OutIntersectBoucle,"Supporting","PeuplerZone ( !isSame!, !Name_1!)","Python_9.3",codeblock3)
     
        j += 1
        
        
        if index ==len(fclist)-1:
                print "La dernière intersection est :" + str(OutIntersectBoucle) +  " + 1"
                arcpy.CalculateField_management(OutIntersectBoucle,"isSame","poly_exc( !isSame!)","Python_9.3",codeblock4)
                 
                 
                 
        # Extraire les enregistrements qui respectent les conditions pour les zones soutenues et supportées
        # Extract feature that meets requirements for Supporting and Supported zones
        arcpy.CopyFeatures_management(OutIntersectBoucle, outIntersect)
         
        # Extract feature that doesn't meets requirements and needs to be Intersect again
        arcpy.MakeFeatureLayer_management(OutIntersectBoucle,IntersectBoucle,isSameQuery)
        arcpy.DeleteField_management(IntersectBoucle,DropField)
        outIntersect = mainFolder + "\\" + "Intersect" + "\\" + "Intersect" + str(j)
        OutIntersectBoucle = "in_memory" + "\\" + "OutIntersect" + str(j)
      
        i += 1

Thanks again

[Pierre-LucBoivin · Accepted solution]

I use a variable to store the count of my list and use it to do catch the last iteration.

lstindex = len(fclist)