#client
import socket
import json

slownik = {'klucz2': 'bartek', 'liczba1': 2 }
sendCords = json.dumps(slownik, sort_keys=True)

HOST = '127.0.0.1'    # The remote host
PORT = 7500             # The same port as used by the server
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
    s.connect((HOST, PORT))
    s.sendall(sendCords.encode('ascii'))
    data = s.recv(1024)

#server
import  socket
import json


HOST = ''
PORT = 7500
while True:
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as _socket:
        _socket.bind((HOST, PORT))
        _socket.listen(1)
        conn, addr = _socket.accept()
        with conn:
            print('connected by: ', addr)
            while True:
                data = conn.recv(1024)
                if not data: break
                rec_data = json.loads(data.decode('ascii'))
                print(rec_data['klucz2'])
                print(rec_data['liczba1'])
                conn.sendall(b'rec')