How create a field of sequential number with autoincrement() that start from zero in arcpy?

Question

I would like to create sequential numbers in a field of a point shapefile that start from 0 with an interval of 0.050. The main code works whenever the start number is not zero.

The original code to put in the codeblock from (https://support.esri.com/en/technical-article/000011137) looks like this:

rec=0 
def autoIncrement(): 
 global rec 
 pStart = 1 
 pInterval = 1 
 if (rec == 0): 
 rec = pStart 
 else: 
 rec += pInterval 
 return rec

How I can make it in arcpy with a "codeblock" and "Expression"?

• dru87: just change rec=0 to something like rec=-999, set pStart=0 and pInterval=0.05 and then update 'if (rec == -999):' this should solve your problem

Answer 1

You can write a function which yields incrementing values:

import arcpy
fc = r"Buildings" #Change
seqfield = "SeqField" #Change
def frange(start, end, step):
 tmp = start
 while(tmp < end):
 yield tmp
 tmp += step
seq = frange(0,100000,0.5)
with arcpy.da.UpdateCursor(fc, seqfield) as cursor:
 for row in cursor:
 row[0] = next(seq)
 cursor.updateRow(row)

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