--- a/python/ccnet/packet.py	2020-01-04 17:50:37.897308652 +0100
+++ b/python/ccnet/packet.py	2020-01-04 17:53:27.244882381 +0100
@@ -72,7 +72,7 @@
 def parse_header(buf):
     try:
         ver, ptype, length, id = struct.unpack(CCNET_HEADER_FORMAT, buf)
-    except struct.error, e:
+    except struct.error as e:
         raise NetworkError('error when unpack packet header: %s' % e)
     
     return PacketHeader(ver, ptype, length, id)