Nested python loop

HaydenLewis — Tue, 06 Jul 2010 01:52:53 GMT

I have an issue with a nested python while loop.
The second loop at line 153 updates the "AVPCC" field with the correct value but does not continue on updating the "AVPCC_DES" field as it sould. What have I done wrong here? Please find txt version of py file attached.

Re: Nested python loop

HaydenLewis — Wed, 07 Jul 2010 00:49:56 GMT

I have found a work around for this issue of nested looping, simply by taking the UpdateCursor "while" loop out of the 1st "while" loop. I have instead created a loop of the feature classes and calculated on those on those once the first "while" loop had finished.
Here is the loop I run after the 1st loop in place of it being inside the 1st loop as shown in the attachment.

gp.Workspace = "F:\PROJECTS\VLUIS\PROCESSING\OUTPUT\PILOT\TEMP"
fcList = gp.ListFeatureClasses ("*","all")

fc= fcList.Next()
print fc
while fc <> None:
        curs = gp.UpdateCursor (fc)
        rows = curs.next()
        tenure = rows.GetValue("TENURE")
        public = rows.GetValue("lu_code")
        publicdesc = rows.GetValue("lu_desc")
        oldavpcc = rows.GetValue("AVPCC")
        oldavpccdesc = rows.GetValue("AVPCC_Desc")
        print "starting if on" +fc
        while rows:

            if rows.GetValue("TENURE")=="PUBLIC":
                 rows.AVPCC_CODE = rows.GetValue("lu_code")
                 curs.UpdateRow(rows)
                 rows.AVPCC_DES = rows.GetValue("lu_desc")
                 curs.UpdateRow(rows)

            elif rows.GetValue("TENURE")=="PRIVATE":
                 rows.AVPCC_CODE = rows.GetValue("AVPCC")
                 curs.UpdateRow(rows)
                 rows.AVPCC_DES = rows.GetValue("AVPCC_Desc")
                 curs.UpdateRow(rows)

            else:
                 rows.AVPCC_CODE = "999"

                 rows.AVPCC_DES = "UNCLASSIFIED"
                 curs.UpdateRow(rows)


            rows = curs.Next()

        del curs
        print fc
        fc= fcList.Next()

Re: Nested python loop

ChrisMathers — Wed, 07 Jul 2010 17:35:32 GMT

You dont need to do <>None on your while loops. Python is smart enough to stop when it runs out of lines 😉

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Nested python loop

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Re: Nested python loop