import json

...

arr1 = [1,2,3]

arr2 = [4,5,6]

someVar = 7

data = json.dumps({"a": arr1, "b": arr2, "c": someVar})

socket.send(data.encode())

import socket, pickle

​

HOST = 'localhost'

PORT = 50007

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.connect((HOST, PORT))

arr = ([1,2,3,4,5,6],[1,2,3,4,5,6])

data_string = pickle.dumps(arr)

s.send(data_string)

​

data = s.recv(4096)

data_arr = pickle.loads(data)

s.close()

print 'Received', repr(data_arr)