added make_torrent.py example and polished the python binding for creating torrents

bindings/python/make_torrent.py

@@ -0,0 +1,27 @@
+#!/bin/python
+
+import sys
+import os
+import libtorrent
+
+if len(sys.argv) < 3:
+	print 'usage make_torrent.py file tracker-url'
+	sys.exit(1)
+
+input = os.path.abspath(sys.argv[1])
+
+fs = libtorrent.file_storage()
+libtorrent.add_files(fs, input)
+if fs.num_files() == 0:
+	print 'no files added'
+	sys.exit(1)
+
+t = libtorrent.create_torrent(fs, 0, 4 * 1024 * 1024)
+
+t.add_tracker(sys.argv[2])
+t.set_creator('libtorrent %s' % libtorrent.version)
+
+libtorrent.set_piece_hashes(t, os.path.split(input)[0], lambda x: sys.stderr.write('.'))
+sys.stderr.write('\n')
+
+print libtorrent.bencode(t.generate())