import serial
import socket
ser = serial.Serial('/dev/ttyUSB0', 9600)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.bind( ("", 14900) )
sock.listen(1)
conn, addr = sock.accept()
while True:
   data = conn.recv(1024)
   if not data:
      break
   elif data == "w":
      ser.write("w")
   elif data == "s":
      ser.write("s")
   elif data == "a":
      ser.write("a")
   elif data == "d":
      ser.write("d")
   else:
      ser.write("j")
conn.close()

import socket
import sys
from PyQt4 import QtGui, QtCore
host = "Х.Х.Х.Х"
port = 14900
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((host, port))
class Icon(QtGui.QWidget):
   def __init__(self, parent=None):
      QtGui.QWidget.__init__(self, parent)
      self.setGeometry(500, 100, 800, 800)
      self.setWindowTitle('TEST')
      self.setWindowIcon(QtGui.QIcon('icons/test.png'))
    def keyPressEvent(self, event):
      if event.key() == QtCore.Qt.Key_W :
         sock.send('w')
      elif event.key() == QtCore.Qt.Key_S :
         sock.send('s')
      elif event.key() == QtCore.Qt.Key_A :
         sock.send('a')
      elif event.key() == QtCore.Qt.Key_D :
         sock.send('d')
   def keyReleaseEvent(self, event):
      sock.send('j')
app = QtGui.QApplication(sys.argv)
icon = Icon()
icon.show()
sys.exit(app.exec_())

while True:
   print ser.readline()
while True:
   data = conn.recv(1024)
   if not data:
      break

while True:
   print ser.readline()
   data = conn.recv(1024)
   if not data:
      break

# -*- coding: utf-8 -*-
import socket
import sys
from PyQt4 import QtCore, QtGui
from PyQt4 import phonon
# Create a TCP/IP socket
host = "192.168.88.250"
port = 14900
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.connect((host, port))
class mainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName(self.toUtf("TEST"))
        MainWindow.resize(1104, 836)
        self.main = QtGui.QWidget(MainWindow)
        MainWindow.setCentralWidget(self.main)
        MainWindow.move(140, 80)
        self.retranslateUi(MainWindow)
        self.keyPressEvent(MainWindow)
        self.keyReleaseEvent(MainWindow)
        
    def keyPressEvent(self, MainWindow):
        if MainWindow.key() == QtCore.Qt.Key_1 :
            sock.send('1')
        elif MainWindow.key() == QtCore.Qt.Key_2 :
            sock.send('2')
        elif MainWindow.key() == QtCore.Qt.Key_3 :
            sock.send('3')
        elif MainWindow.key() == QtCore.Qt.Key_4 :
            sock.send('4')
    def keyReleaseEvent(self, MainWindow):
        sock.send('j')
        
    def retranslateUi(self, MainWindow):
        MainWindow.setWindowTitle(self.toUtf("TEST"))
       
    def toUtf(self, text):
        # та самая функция перевода
        return QtGui.QApplication.translate("MainWindow", text, None, QtGui.QApplication.UnicodeUTF8)
def init():
    app = QtGui.QApplication(sys.argv)
    MainWindow = QtGui.QMainWindow()
    form = mainWindow()
    form.setupUi(MainWindow)
    return app, form, MainWindow

# -*- coding: utf-8 -*-
import sys
from forms import MainForm
 
def main():
    app, mainForm, window = MainForm.init() 
    window.show()
    sys.exit(app.exec_())
if __name__ == "__main__":
    main()

self.keyPressEvent(MainWindow)