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def purge_logs():
    vm_list = get_VMList()

    for vm in vm_list:
        syslog_file = get_syslog_file_location(vm)
        retention_period = get_retention_period(vm)

    vm_details = get_vm_details()
    for vm in vm_details:
        vm_id = vm['vm_id']
        vm_ip = vm['vm_ip']
        bookmark_index = get_bookmark_index(vm_ip)

        print("VM:", vm_id)
        print("Syslog File Location:", syslog_file)
        print("Retention Period:", retention_period)
        print("Bookmark Index:", bookmark_index)
        print("Purging Logs...")

        try:
            #bookmark_line = linecache.getline(syslog_file, int(bookmark_index))
            bookmark_line = linecache.getline(syslog_file, 7092032)
            print("Bookmark Line :", bookmark_line)
        except Exception as e:
            print("Exception while reading line from file:", e)
            return None

        if not bookmark_line:
            print("Bookmark line not found.")
            continue

        bookmark_timestamp = get_timestamp_from_line(bookmark_line)

        # Calculate the purging date (7 days before the bookmark timestamp)
        bookmark_date = datetime.datetime.strptime(bookmark_timestamp, "%Y-%m-%dT%H:%M:%S+00:00")
        purging_date = bookmark_date - datetime.timedelta(days=7)

        # Perform the log purging
        lines_to_keep = []
        lines_purged = 0  # Counter for purged lines
        with open(syslog_file, "r") as file:
            for line in file:
                timestamp = get_timestamp_from_line(line)
                line_date = datetime.datetime.strptime(timestamp, "%Y-%m-%dT%H:%M:%S+00:00")
                if line_date > purging_date:
                    lines_to_keep.append(line)
                else:
                    lines_purged += 1

        # Write the lines to keep back to the syslog file
        with open(syslog_file, "w") as file:
            file.writelines(lines_to_keep)

        print("Purging Completed")
        print(f"Lines Purged: {lines_purged}")
        print("Printing First Two Lines:")
        with open(syslog_file, "r") as file:
            print(file.readline())
            print(file.readline())
        print()

purge_logs()


When i Run the code- 

I get the output as -

VM: 23
Syslog File Location: /var/log/syslog/LONSTBYRDEV02-10.72.209.183.log
Retention Period: 7
Bookmark Index: 4212032
Purging Logs...
Bookmark Line :
Bookmark line not found.

Ideally if we check /var/log/syslog/LONSTBYRDEV02-10.72.209.183.log this is the correct path of the log file and it contains a total of 5644752 lines.

Also the particular line is present in the log file when we manually check using this-

 head -n 4212032 /var/log/syslog/LONSTBYRDEV02-10.72.209.183.log | tail -1

So if line content is present also , the filename is proper then why it is not able ti get the bookmark line from index using linecache.