User defined mean test times

Hello,
I have a scenario where I have to separate out 200 responses from the 304
responses and record mean test times for each. However, it so happens that
unless i make a request, i do not know if its a 200 or 304. Here is what I
am currently doing. (Not working though)

--------------------------------------------------------------

grinder.statistics.registerDataLogExpression("200 response", "userLong0") 
grinder.statistics.registerDataLogExpression("304 response", "userLong1")
grinder.statistics.registerSummaryExpression("Mean 200 response", "(/ (sum
userLong0) (count userLong0) )")
grinder.statistics.registerSummaryExpression("Mean 304 response", "(/ (sum
userLong1) (count userLong1) )")
 
Class X:
  def getFeed(self):
            feeduri = "abc.com/feeds"
            result = feedrequest.GET(feedUri)
            testStatistics = grinder.statistics.forCurrentTest
            timetogetfeed = testStatistics.getTime()
            if result.getStatusCode() == 200:
                etag = result.getHeader('ETag')
                userObject.setEtag(etag)
                print "---------------- 200 : ",timetogetfeed
                testStatistics.addLong("userLong0", timetogetfeed)
            elif result.getStatusCode() == 304:
                print "---------------- 304 : ", timetogetfeed
                testStatistics.addLong("userLong1", timetogetfeed)


Test(100, 'feed request 123').record(X.getFeed)
--------------------------------------------------------------

What am i doing wrong here..? The expression gives an exception at
RegisterSummaryExpression (given below).

net.grinder.scriptengine.jython.JythonScriptExecutionException: Java
exception initialising test script
        grinder.statistics.registerSummaryExpression("Mean 200 response",
"(/ (sum userLong0) (count userLong0) )")
        File
"C:\Users\reddys.ADS\.\HYDCNU304BWC0-file-store\current\a360utility.py",
line 79, in <module>
        from a360utility import A360Utility



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