Add csv example.

examples/csv_generator.py

@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+"""
+file: csv_generator.py
+This file is part of nfstream.
+
+Copyright (C) 2019-20 - Zied Aouini <aouinizied@gmail.com>
+
+nfstream is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
+
+nfstream is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with nfstream.
+If not, see <http://www.gnu.org/licenses/>.
+"""
+
+from nfstream import NFStreamer
+import sys
+import datetime
+
+
+path = sys.argv[1]
+output_file_name = path + ".csv"
+print("nfstream processing started. Use Ctrl+C to interrupt and save.")
+start = datetime.datetime.now()
+df = NFStreamer(source=path, statistics=True, idle_timeout=1).to_pandas()
+end = datetime.datetime.now()
+df.to_csv(output_file_name)
+print("nfstream processed {} flows and saved them in file: {}".format(df.shape[0], output_file_name))
+print("Processing time: {}".format(end - start))