Apache Python dupe catcher

dupe.py

#!/usr/bin/env python
"Searches for KEY in GET request - combined Apache format (I think)"""

KEY = "GET /cgi-bin/blah?var=myvar"
LOG = "tmp.log"


def findDupes(log):
    dupes = []
    for l in log:
        get = l.split('"', 1)[1]
        match = 0
        for m in log:
            if get in m:
                match += 1
                if match > 1 and l not in dupes:
                    dupes.append(l)
    return dupes

def findKey(log):
    recs = []
    for line in log:
        if KEY in line:
            recs.append(line)
    return recs

def getLogContents():
    f = open(LOG, "r")
    all = f.readlines()
    f.close()
    return all

def writeLog(lines, log="alog"):
    f = open(log, "w")
    for line in lines:
        myno = line.split("MyNo=", 1)[1][:9]
        f.write(polno + "\n")
        f.write(line)
    f.close()

def main():
    log = getLogContents()
    recs = findKey(log)
    dupes = findDupes(recs)
    writeLog(dupes)



if __name__ == "__main__":
    main()