diff --git a/daemon/scripts/core-manage b/daemon/scripts/core-manage
index 87d23a24..93247f6f 100644
--- a/daemon/scripts/core-manage
+++ b/daemon/scripts/core-manage
@@ -119,13 +119,13 @@ class FileUpdater(object):
             search = "emane_models ="
         elif target == "nodetype":
             if self.options.userpath is None:
-                raise ValueError, "missing user path"
+                raise ValueError("missing user path")
             filename = os.path.join(self.options.userpath, "nodes.conf")
             search = self.data
         else:
-            raise ValueError, "unknown target"
+            raise ValueError("unknown target")
         if not os.path.exists(filename):
-            raise ValueError, "file %s does not exist" % filename
+            raise ValueError("file %s does not exist" % filename)
         return search, filename
 
     def update_file(self, fn=None):
@@ -236,7 +236,7 @@ def main():
     try:
         up = FileUpdater(action, target, data, options)
         r = up.process()
-    except Exception, e:
+    except Exception as e:
         sys.stderr.write("Exception: %s\n" % e)
         sys.exit(1)
     if not r:
diff --git a/daemon/scripts/coresendmsg b/daemon/scripts/coresendmsg
index d8d8a2d3..03551e8a 100644
--- a/daemon/scripts/coresendmsg
+++ b/daemon/scripts/coresendmsg
@@ -19,9 +19,9 @@ def print_available_tlvs(t, tlv_class):
     """
     Print a TLV list.
     """
-    print "TLVs available for %s message:" % t
+    print("TLVs available for %s message:" % t)
     for tlv in sorted([tlv for tlv in tlv_class.tlv_type_map], key=lambda x: x.name):
-        print "%s:%s" % (tlv.value, tlv.name)
+        print("%s:%s" % (tlv.value, tlv.name))
 
 
 def print_examples(name):
@@ -52,9 +52,9 @@ def print_examples(name):
          "srcname=\"./test.log\"",
          "move a test.log file from host to node 2"),
     ]
-    print "Example %s invocations:" % name
+    print("Example %s invocations:" % name)
     for cmd, descr in examples:
-        print "  %s %s\n\t\t%s" % (name, cmd, descr)
+        print("  %s %s\n\t\t%s" % (name, cmd, descr))
 
 
 def receive_message(sock):
@@ -68,7 +68,7 @@ def receive_message(sock):
         data = sock.recv(4096)
         msghdr = data[:coreapi.CoreMessage.header_len]
     except KeyboardInterrupt:
-        print "CTRL+C pressed"
+        print("CTRL+C pressed")
         sys.exit(1)
 
     if len(msghdr) == 0:
@@ -84,11 +84,11 @@ def receive_message(sock):
     except KeyError:
         msg = coreapi.CoreMessage(msgflags, msghdr, msgdata)
         msg.message_type = msgtype
-        print "unimplemented CORE message type: %s" % msg.type_str()
+        print("unimplemented CORE message type: %s" % msg.type_str())
         return msg
     if len(data) > msglen + coreapi.CoreMessage.header_len:
-        print "received a message of type %d, dropping %d bytes of extra data" \
-              % (msgtype, len(data) - (msglen + coreapi.CoreMessage.header_len))
+        print("received a message of type %d, dropping %d bytes of extra data" \
+              % (msgtype, len(data) - (msglen + coreapi.CoreMessage.header_len)))
     return msgcls(msgflags, msghdr, msgdata)
 
 
@@ -103,15 +103,15 @@ def connect_to_session(sock, requested):
     smsg = coreapi.CoreSessionMessage.pack(flags, tlvdata)
     sock.sendall(smsg)
 
-    print "waiting for session list..."
+    print("waiting for session list...")
     smsgreply = receive_message(sock)
     if smsgreply is None:
-        print "disconnected"
+        print("disconnected")
         return False
 
     sessstr = smsgreply.get_tlv(SessionTlvs.NUMBER.value)
     if sessstr is None:
-        print "missing session numbers"
+        print("missing session numbers")
         return False
 
     # join the first session (that is not our own connection)
@@ -119,7 +119,7 @@ def connect_to_session(sock, requested):
     sessions = sessstr.split("|")
     sessions.remove(str(localport))
     if len(sessions) == 0:
-        print "no sessions to join"
+        print("no sessions to join")
         return False
 
     if not requested:
@@ -127,10 +127,10 @@ def connect_to_session(sock, requested):
     elif requested in sessions:
         session = requested
     else:
-        print "requested session not found!"
+        print("requested session not found!")
         return False
 
-    print "joining session: %s" % session
+    print("joining session: %s" % session)
     tlvdata = coreapi.CoreSessionTlv.pack(SessionTlvs.NUMBER.value, session)
     flags = MessageFlags.ADD.value
     smsg = coreapi.CoreSessionMessage.pack(flags, tlvdata)
@@ -142,12 +142,12 @@ def receive_response(sock, opt):
     """
     Receive and print a CORE message from the given socket.
     """
-    print "waiting for response..."
+    print("waiting for response...")
     msg = receive_message(sock)
     if msg is None:
-        print "disconnected from %s:%s" % (opt.address, opt.port)
+        print("disconnected from %s:%s" % (opt.address, opt.port))
         sys.exit(0)
-    print "received message:", msg
+    print("received message: %s" % msg)
 
 
 def main():
@@ -162,13 +162,13 @@ def main():
     usagestr += "Supported message flags (flags=f1,f2,...):\n  %s" % flags
     parser = optparse.OptionParser(usage=usagestr)
     parser.set_defaults(
-            port=CORE_API_PORT,
-            address="localhost",
-            session=None,
-            listen=False,
-            examples=False,
-            tlvs=False,
-            tcp=False
+        port=CORE_API_PORT,
+        address="localhost",
+        session=None,
+        listen=False,
+        examples=False,
+        tlvs=False,
+        tcp=False
     )
 
     parser.add_option("-H", dest="examples", action="store_true",
@@ -217,7 +217,7 @@ def main():
 
     # build a message consisting of TLVs from "type=value" arguments
     flagstr = ""
-    tlvdata = ""
+    tlvdata = b""
     for a in args:
         typevalue = a.split("=")
         if len(typevalue) < 2:
@@ -255,11 +255,11 @@ def main():
     try:
         sock.connect((opt.address, opt.port))
     except Exception as e:
-        print "Error connecting to %s:%s:\n\t%s" % (opt.address, opt.port, e)
+        print("Error connecting to %s:%s:\n\t%s" % (opt.address, opt.port, e))
         sys.exit(1)
 
     if not connect_to_session(sock, opt.session):
-        print "warning: continuing without joining a session!"
+        print("warning: continuing without joining a session!")
 
     sock.sendall(msg)
     if opt.listen: