topic Re: Trying query a hosted feature layer using a variable in ArcGIS API for Python Questions

Trying query a hosted feature layer using a variable

AnthonyAtkins2 — Sun, 12 Dec 2021 10:19:14 GMT

I'm trying to query a hosted feature layer, but instead of having a literal string for the where clause I'm using a variable because the values will change depending on other factors.

Snippet of my code:

parcelList = collectParcels() #collectParcels just reads an excel document of parcel numbers and returns a list
query1 = '\" PARCEL_NO in ' + str(parcelList).replace("[", "(").replace("]", ")") + '\"'
try:
    query_Result = AGOL_Parcels.query(where=query1, return_count_only=True)
    for x in query_Result:
        print(x.as_dict['attributes']['PIN'])
except Exception:
    e = sys.exc_info()[1]
    print(e.args[0])

when I run this code I get this error:

'where' parameter is invalid
(Error Code: 400)

Process finished with exit code 0

Ironically, when I print to the screen, the value of my query1 variable and copy and paste that string value in place of the query1 variable, the code runs perfectly. I can also remove the where clause entirely and the script runs.

Re: Trying query a hosted feature layer using a variable

RandyBurton — Sun, 12 Dec 2021 10:19:16 GMT

Depending on parcel numbers being text or integer, try one of the following:

# Text:
query1 = "PARCEL_NO IN ('{}')".format("', '".join(parcelList))

# Integer
query1 = "PARCEL_NO IN ({})".format(", ".join(str(p) for p in parcelList))


>>> parcelList = ['A123', 'B456']
>>> print("PARCEL_NO IN ('{}')".format("', '".join(parcelList)))
PARCEL_NO IN ('A123', 'B456')
>>> parcelList = [123, 456]
>>> print("PARCEL_NO IN ({})".format(", ".join(str(p) for p in parcelList)))
PARCEL_NO IN (123, 456)
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Re: Trying query a hosted feature layer using a variable

AnthonyAtkins2 — Thu, 29 Oct 2020 17:54:49 GMT

This worked absolutely perfectly! Thank you!!!