Custom Python script executes twice?

Some background....

I want to have an alert which triggers when the results of two independent searches have data Search 1 = a simple search which will be contained within the alert/saved-search Search 2 = will be triggered with the results of search1 using custom searches written with python.

The script will perform the following

1. Check results passed in (from search 1) and if zero return empty data (not coded yet but easy)
2. If results are present then authenticate to splunk and perform search 2.
3. Take results or search 2 and append to search 1 data passed into python script
4. return data to splunk and alert

Results When searching from the Splunk web console with the command

sourcetype="holdingRegisters" SPLUNK=StationStatusCoil | dedup station | stationstartcheck __EXECUTE__

By looking at the logfiles the script is run twice by splunk for some reason???

So to my questions

Why is it running twice when performing a search in Splunk?

Note the script is just a skeleton of what I plan to do but the main components are there. It works but just fills the original data with junk. I plan to fill it with the results of the second search.

I am using splunk 4.3 and my custom search is below.

import csv
import sys
import splunk.Intersplunk
import string
import datetime
import splunk.auth, splunk.search
import time

start = time.time()

# open logfile
f = open('/tmp/stationStartCheck.log', 'w+')
f.write(str(time.time() - start ) + ' - Starting\n')
f.write(str(time.time() - start ) + ' - argv length ' + str(len(sys.argv)) + '\n')

(isgetinfo, sys.argv) = splunk.Intersplunk.isGetInfo(sys.argv)

if isgetinfo:
    splunk.Intersplunk.outputInfo(False, False, True, False, None, True)
    # outputInfo automatically calls sys.exit()

# check existing data to determine which station we are dealing with
try:
    f.write(str(time.time() - start ) + ' - Getting results from Splunk\n')
    results = splunk.Intersplunk.readResults(None, None, True)
    f.write(str(time.time() - start ) + ' - Success\n')

    f.write(str(time.time() - start ) + ' - Size of resultset' + str(len(results)) + '\n')

except Exception, e:
    splunk.Intersplunk.generateErrorResults("Unhandled exception:  %s" % (e,))

# perform secondary search and output results if any
try:
    f.write(str(time.time() - start ) + ' - Authenticating....\n')
    key = splunk.auth.getSessionKey('admim','changeme')

    f.write(str(time.time() - start ) + ' - Sending Search....\n')
    my_job = splunk.search.dispatch('search sourcetype="holdingRegisters" SPLUNK=StationStatusCoil | dedup station', namespace='search', earliestTime='-1h', maxEvents=10)

    while not my_job.isDone:
        f.write(str(time.time() - start ) + ' - Waiting for results....\n')
        time.sleep(1)

    f.write(str(time.time() - start ) + ' - Results returned' + str(my_job.resultCount) + '\n')

    for result in my_job.results:
        f.write(str(result['station']) + '\n')

    for i in range(len(results)):
        f.write(str(time.time() - start ) + ' - Adding field to original result set\n')
        results[i]['newField'] = 'uno'

    splunk.Intersplunk.outputResults(results)
    my_job.cancel()

except Exception, e:
    splunk.Intersplunk.generateErrorResults("Unhandled exception:  %s" % (e,))

# close logfile
f.close()

So when performing this search in the Splunk search bar

sourcetype="holdingRegisters" SPLUNK=StationStatusCoil | dedup station | stationstartcheck __EXECUTE__

The logfile has the following output

    tail: /tmp/stationStartCheck.log: file truncated
    Starting
    argv length 2
    0.00281405448914 - Getting results from Splunk
    0.00357985496521 - Success
    0.00358605384827 - Size of resultset4
    0.00359296798706 - Authenticating....
    0.01722407341 - Sending Search....
    0.302284002304 - Waiting for results....
    1.42954897881 - Results returned4
    Station1
    Station2
    Station3
    Station4
    1.47054505348 - Adding field to original result set
    1.47056603432 - Adding field to original result set
    1.4705760479 - Adding field to original result set
    1.47058486938 - Adding field to original result set
    tail: /tmp/stationStartCheck.log: file truncated
    Starting
    argv length 2
    0.000216960906982 - Getting results from Splunk
    0.000913143157959 - Success
    0.000919103622437 - Size of resultset4
    0.00092601776123 - Authenticating....
    0.0146579742432 - Sending Search....
    0.293842077255 - Waiting for results....
    1.30643010139 - Results returned4
            Station1
    Station2
    Station3
    Station4
    1.32303500175 - Adding field to original result set
    1.32305502892 - Adding field to original result set
    1.32306408882 - Adding field to original result set
    1.32308411598 - Adding field to original result set

Any ideas how to stop it running twice