Remove py2 support

Change-Id: Ieeaeb3b8efcae004e94aea6c1d2703c9782a8650
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/21320
Tested-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>

secop/protocol/interface/__init__.py

@@ -28,7 +28,7 @@ SPACE = b' '
 def encode_msg_frame(action, specifier=None, data=None):
     """ encode a msg_tripel into an msg_frame, ready to be sent
 
-    action (and optional specifier) are unicode strings,
+    action (and optional specifier) are str strings,
     data may be an json-yfied python object"""
     action = action.encode('utf-8')
     if specifier is None:
@@ -54,7 +54,7 @@ def get_msg(_bytes):
 
 
 def decode_msg(msg):
-    """decode the (binary) msg into a (unicode) msg_tripel"""
+    """decode the (binary) msg into a (str) msg_tripel"""
     # check for leading/trailing CR and remove it
     res = msg.split(b' ', 2)
     action = res[0].decode('utf-8')

secop/protocol/interface/tcp.py

@@ -19,11 +19,11 @@
 #
 # *****************************************************************************
 """provides tcp interface to the SECoP Server"""
-from __future__ import division, print_function
 
-import collections
-import socket
 import sys
+import socket
+import collections
+import socketserver
 
 from secop.datatypes import StringType, IntRange, BoolType
 from secop.errors import SECoPError
@@ -34,17 +34,10 @@ from secop.protocol.interface import decode_msg, encode_msg_frame, get_msg
 from secop.protocol.messages import ERRORPREFIX, \
     HELPREPLY, HELPREQUEST, HelpMessage
 
-try:
-    import socketserver  # py3
-except ImportError:
-    import SocketServer as socketserver  # py2
-
-
 
 DEF_PORT = 10767
 MESSAGE_READ_SIZE = 1024
 
-
 CR = b'\r'
 SPACE = b' '
 

secop/protocol/interface/zmq.py

@@ -21,7 +21,6 @@
 # *****************************************************************************
 """provide a zmq server"""
 
-from __future__ import division, print_function
 
 # tbd.