no import (i)zip in py3

router.py

@@ -3,7 +3,7 @@
 
 import sys, time
 from array import array
-from itertools import islice, zip, groupby
+from itertools import islice, groupby
 from random import shuffle
 from mymath import *
 from layer import *

view_mpl.py

@@ -4,7 +4,7 @@
 
 import os, sys, argparse, select
 from ast import literal_eval
-from itertools import zip, islice, chain
+from itertools import islice, chain
 from mymath import *
 
 import matplotlib.pyplot as plt