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ArcPy script in toolbox - what do I do about optional parameters?

RosieBell

I made my first Python tool this week, a Search by Attribute tool to search our cadastre. When I have required parameters it works beautifully. As soon as I make the parameters optional, it doesn't return any results (even if I complete all the fields).

What am I doing wrong? I added the 'if' line after reading another thread about optional parameters, but it doesn't make any difference with this problem. Thanks.

#define user parameter for road name, and locality  SelCondition = arcpy.GetParameterAsText(0) if (not SelCondition) or (SelCondition == "#") or (len(SelCondition.strip()) == 0):     SelCondition = ""   LocalityName = arcpy.GetParameterAsText(1) if (not LocalityName) or (LocalityName == "#") or (len(LocalityName.strip()) == 0):     LocalityName = ""   # select cadastral lots on road name and locality, and lot no arcpy.SelectLayerByAttribute_management("Cadastre","NEW_SELECTION", "\"ROAD_NAME\" = "+SelCondition)  arcpy.SelectLayerByAttribute_management("Cadastre","SUBSET_SELECTION", "\"LOCALITY\" = "+LocalityName)

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Accepted answers

JochenManegold2

I think the code is fine. I tested it, and for me it worked:

import arcpy value = arcpy.GetParameterAsText(0) if value == "#" or value == "":    value = None if value:   arcpy.SelectLayerByAttribute_management("dachflaechen","NEW_SELECTION", "\"OBJECTID\" = "+value) else:   arcpy.AddError("no value")

All comments

RosieBell

Sorry for the slow reply. I tried both solutions shortly after they were posted, but couldn't get either of them to work. I tried again jm's solution again today and it did the job, many thanks. carrierkh, no doubt it was my inexperience that was the problem, so thankyou for your help.

KenCarrier

Try this

#define user parameter for road name, and locality

SelCondition = arcpy.GetParameterAsText(0)
if (not SelCondition) or (SelCondition == "#") or (len(SelCondition.strip()) == 0): SelCondition = ""

LocalityName = arcpy.GetParameterAsText(1)
if (not LocalityName) or (LocalityName == "#") or (len(LocalityName.strip()) == 0): LocalityName = ""

# select cadastral lots on road name and locality, and lot no
roadQuery = " UPPER(\"{0}\") = UPPER('{1}') ".format(ROAD_NAME, string.upper(SelCondition))
arcpy.SelectLayerByAttribute_management("Cadastre","NEW_SELECTION", roadQuery)

localityQuery = " UPPER(\"{0}\") = UPPER('{1}') ".format(LOCALITY, string.upper(LocalityName))
arcpy.SelectLayerByAttribute_management("Cadastre","NEW_SELECTION", localityQuery)

JochenManegold2

I think the code is fine. I tested it, and for me it worked:

import arcpy value = arcpy.GetParameterAsText(0) if value == "#" or value == "":    value = None if value:   arcpy.SelectLayerByAttribute_management("dachflaechen","NEW_SELECTION", "\"OBJECTID\" = "+value) else:   arcpy.AddError("no value")

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