gui.py

import sys
import subprocess
import threading
import time
import io
from PyQt4 import QtCore,QtGui
import gui
import re
class MyForm(QtGui.QMainWindow):
  def __init__(self,parent=None):
    QtGui.QWidget.__init__(self,parent)
    self.ui = gui.Ui_MainWindow()
    self.ui.setupUi(self)
    QtCore.QObject.connect(self.ui.pushButton,QtCore.SIGNAL('clicked()'),self.download)
  def test(self):
    print(self.ui.lineEdit.text())
  def download(self):
    f = open('output','w')
    p = subprocess.Popen(['python','./__main__.py',self.ui.lineEdit.text()],shell=False,stdin=subprocess.PIPE,stderr=f, stdout=f,bufsize=-1)
    t = Reader(self)
    t.start()
class Reader(threading.Thread):
  def __init__(self,MyForm):
    threading.Thread.__init__(self)
    self.fil = open('output','r')
    self.var = 2
    self.form = MyForm
    self.percent = 
  def get_last_line(self):
    a = self.fil.readlines()
    return a[len(a)-1]
  def run(self):
    while True:
      try:
        time.sleep(0.2)
        self.var = self.get_last_line()
        print(self.var)
        self.form.ui.label_3.setText(self.var)
      except IndexError:
        print("No new informations, waiting 0.1 sec. more")
        time.sleep(0.1)
app = QtGui.QApplication(sys.argv)
g = MyForm()
g.show()
sys.exit(app.exec_())