Python Socket Program - NameError: name 'self' is not defined. I changed the localhost, ports etc but this error refuses to go away

There appears to be nothing wrong with your code. I just used it to create a simple test application

# ClientSocket.py
import socket

MAX_BUFFER_SIZE = 4096

class ClientSocket:

    def __init__(self):
        print("Client socket started....")
        self.soc = None

    def send_to_Server(self, data):
        print('Time to send data to Server..... %s', data)
        self.soc.send(data.encode("utf8"))   

    def receive_from_Server(self):
        print('Time to receive from Server.....')
        result_bytes = self.soc.recv(MAX_BUFFER_SIZE)
        result_string = result_bytes.decode("utf8")
        print("Result from server is {}".format(result_string))

    def start_client(self):
        self.soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.soc.connect(("localhost", 8000))
        print('Client connected....')


cs = ClientSocket()

cs.start_client()
cs.send_to_Server('Hello')
cs.receive_from_Server()

here's a simple test server which just spits back some JSON data

# test_server.py
import socket
from datetime import datetime
import json

def logMessage(clientMessage):
    logTime = datetime.today();
    msg = "{} | {}\n".format(logTime, clientMessage)
    print msg


TCP_PORT = 8000

server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server.bind(('localhost', TCP_PORT))

# listen() puts the socket into server mode, 
server.listen(1)
while True:
    # wait for an incoming connection
    connection, address = server.accept()

    try:
        # receive data in chunks of 64 bytes
        while True:
            data = connection.recv(64)

            # how do we know if we received all the data?

            if data:
                # we received data from the client, log it to the file
                logMessage(data)

                response = {
                    'name'       : 'Jonathan Swift',
                    'occupation' : 'author' 
                }

                jsonResponse  = json.dumps(response)
                messageLength = len(jsonResponse)
                bytesSent     = 0

                # send a response to the client after turning our dict into
                # a JSON string
                while(bytesSent < messageLength):
                    sent = connection.send(jsonResponse)
                    bytesSent += sent
            else:
                # no data, break out of receiving loop
                break
    except Exception as e:
        raise
    finally:

        connection.close()

import socket

MAX_BUFFER_SIZE = 4096

class ClientSocket:
    soc = None
    def __init__(self):
        print("Client socket started....")
        self.soc = None

    def send_to_Server(self, data):
        print('Time to send data to Server..... %s', data)
        self.soc.send(data.encode("utf8"))

    def receive_from_Server(self):
        print('Time to receive from Server.....')
        result_bytes = self.soc.recv(MAX_BUFFER_SIZE)
        result_string = result_bytes.decode("utf8")
        print("Result from server is {}".format(result_string))

    def start_client(self):
        self.soc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.soc.connect(("localhost", 8000))
        print('Client connected....')

you should define the soc variable after class statement so that you can use it globally.