client.py

import sys,time
from PyQt5 import QtGui
from PyQt5 import QtCore
from PyQt5.QtWidgets import QScrollBar,QSplitter,QTableWidgetItem,QTableWidget,QComboBox,QVBoxLayout,QGridLayout,QDialog,QWidget, QPushButton, QApplication, QMainWindow,QAction,QMessageBox,QLabel,QTextEdit,QProgressBar,QLineEdit
from PyQt5.QtCore import QCoreApplication
import socket
from threading import Thread 
from socketserver import ThreadingMixIn 

tcpClientA=None

class Window(QDialog): 
    def __init__(self):
        super().__init__()
        self.flag=0
        self.chatTextField=QLineEdit(self)
        self.chatTextField.resize(480,100)
        self.chatTextField.move(10,350)
        self.btnSend=QPushButton("send",self)
        self.btnSend.resize(480,30)
        self.btnSendFont=self.btnSend.font()
        self.btnSendFont.setPointSize(15)
        self.btnSend.setFont(self.btnSendFont)
        self.btnSend.move(10,460)
        self.btnSend.setStyleSheet("background-color:  #0e7ad4 ")
        self.btnSend.clicked.connect(self.send)
        self.chatBody=QVBoxLayout(self)
        splitter=QSplitter(QtCore.Qt.Vertical)
        self.chat = QTextEdit()
        self.chat.setReadOnly(True)
        splitter.addWidget(self.chat)
        splitter.addWidget(self.chatTextField)
        splitter.setSizes([400,100])
        splitter2=QSplitter(QtCore.Qt.Vertical)
        splitter2.addWidget(splitter)
        splitter2.addWidget(self.btnSend)
        splitter2.setSizes([200,10])
        self.chatBody.addWidget(splitter2)
        self.setWindowTitle("Chat Application")
        self.resize(500, 500)

    def send(self): 
        text=self.chatTextField.text()
        font=self.chat.font()
        font.setPointSize(13)
        self.chat.setFont(font)
        textFormatted='{:>80}'.format(text)
        self.chat.append(textFormatted)
        tcpClientA.send(text.encode())
        self.chatTextField.setText("")

class ClientThread(Thread):
    def __init__(self,window): 
        Thread.__init__(self) 
        self.window=window
 
    def run(self):
       host = socket.gethostname() 
       port = 8080
       BUFFER_SIZE = 2000 
       global tcpClientA
       tcpClientA = socket.socket(socket.AF_INET, socket.SOCK_STREAM) 
       tcpClientA.connect((host, port))
       
       while True: 
           data = tcpClientA.recv(BUFFER_SIZE)
           window.chat.append(data.decode("utf-8"))
       tcpClientA.close() 


if __name__ == '__main__': 
    app = QApplication(sys.argv)
    window = Window()
    clientThread=ClientThread(window)
    clientThread.start()
    window.exec()
    sys.exit(app.exec_())