python socket recv hanging

Question

I'm trying to connect my codes those are written in python and processing(java). python hangs until it gets some data. it makes some problem for me! i use select.select but it hangs again until it gets some data. I am pleased if you help me.

here is my python socket class:

import socket
import select
import time

class client():
    def __init__(self,HOST,PORT):
        self.HOST = HOST              # Symbolic name meaning all available interfaces
        self.PORT = PORT              # Arbitrary non-privileged port
        self.connect()
    def connect(self):
        self.s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        self.s.bind((self.HOST, self.PORT))
        self.s.listen(1)
        self.conn, self.addr = self.s.accept()
        print('Connected by', self.addr)
        return
    def readData(self):
        do_read = False
        try:
            r, _, _ = select.select([self.conn], [], [])
            do_read = bool(r)
        except socket.error:
            pass
        if do_read:
            # ready to receive
            data = self.conn.recv(1024)
            return data
        return 0

print('hello')
x=client('localhost',5204);
#print('Connected by', addr)
while True:
    data=x.readData();
    if data:
        print(data)