def DownloadActivityList(self, svcRec, exhaustive=False):
        dbcl = self._getClient(svcRec)
        if not svcRec.Authorization["Full"]:
            syncRoot = "/"
        else:
            syncRoot = svcRec.Config["SyncRoot"]
        cache = cachedb.dropbox_cache.find_one({"ExternalID": svcRec.ExternalID})
        if cache is None:
            cache = {"ExternalID": svcRec.ExternalID, "Structure": [], "Activities": {}}
        if "Structure" not in cache:
            cache["Structure"] = []
        self._folderRecurse(cache["Structure"], dbcl, syncRoot)

        activities = []
        exclusions = []

        for dir in cache["Structure"]:
            for file in dir["Files"]:
                path = file["Path"]
                if svcRec.Authorization["Full"]:
                    relPath = path.replace(syncRoot, "", 1)
                else:
                    relPath = path.replace("/Apps/tapiriik/", "", 1)  # dropbox api is meh api

                hashedRelPath = self._hash_path(relPath)
                if hashedRelPath in cache["Activities"]:
                    existing = cache["Activities"][hashedRelPath]
                else:
                    existing = None

                if not existing:
                    # Continue to use the old records keyed by UID where possible
                    existing = [(k, x) for k, x in cache["Activities"].items() if "Path" in x and x["Path"] == relPath]  # path is relative to syncroot to reduce churn if they relocate it
                    existing = existing[0] if existing else None
                    if existing is not None:
                        existUID, existing = existing
                        existing["UID"] = existUID

                if existing and existing["Rev"] == file["Rev"]:
                    # don't need entire activity loaded here, just UID
                    act = UploadedActivity()
                    act.UID = existing["UID"]
                    try:
                        act.StartTime = datetime.strptime(existing["StartTime"], "%H:%M:%S %d %m %Y %z")
                    except:
                        act.StartTime = datetime.strptime(existing["StartTime"], "%H:%M:%S %d %m %Y") # Exactly one user has managed to break %z :S
                    if "EndTime" in existing:  # some cached activities may not have this, it is not essential
                        act.EndTime = datetime.strptime(existing["EndTime"], "%H:%M:%S %d %m %Y %z")
                else:
                    logger.debug("Retrieving %s (%s)" % (path, "outdated meta cache" if existing else "not in meta cache"))
                    # get the full activity
                    try:
                        act, rev = self._getActivity(svcRec, dbcl, path)
                    except APIExcludeActivity as e:
                        logger.info("Encountered APIExcludeActivity %s" % str(e))
                        exclusions.append(strip_context(e))
                        continue

                    try:
                        act.EnsureTZ()
                    except:
                        pass # We tried.

                    if hasattr(act, "OriginatedFromTapiriik") and not act.CountTotalWaypoints():
                        # This is one of the files created when TCX export was hopelessly broken for non-GPS activities.
                        # Right now, no activities in dropbox from tapiriik should be devoid of waypoints - since dropbox doesn't receive stationary activities
                        # In the future when this changes, will obviously have to modify this code to also look at modification dates or similar.
                        if ".tcx.summary-data" in path:
                            logger.info("...summary file already moved")
                        else:
                            logger.info("...moving summary-only file")
                            dbcl.file_move(path, path.replace(".tcx", ".tcx.summary-data"))
                        continue # DON'T include in listing - it'll be regenerated
                    del act.Laps
                    act.Laps = []  # Yeah, I'll process the activity twice, but at this point CPU time is more plentiful than RAM.
                    cache["Activities"][hashedRelPath] = {"Rev": rev, "UID": act.UID, "StartTime": act.StartTime.strftime("%H:%M:%S %d %m %Y %z"), "EndTime": act.EndTime.strftime("%H:%M:%S %d %m %Y %z")}
                tagRes = self._tagActivity(relPath)
                act.ServiceData = {"Path": path, "Tagged":tagRes is not None}

                act.Type = tagRes if tagRes != None else ActivityType.Other

                logger.debug("Activity s/t %s" % act.StartTime)

                activities.append(act)

        if "_id" in cache:
            cachedb.dropbox_cache.save(cache)
        else:
            cachedb.dropbox_cache.insert(cache)
        return activities, exclusions
dataset/ETHPy150Open cpfair/tapiriik/tapiriik/services/Dropbox/dropbox.py/DropboxService.DownloadActivityList/operator `is not` -> `!=`