PyQt falling to refresh window

Hey I am trying to refresh the GUI window, but for some reason it does not refresh till all of the loops are finished. I read the other posts and tried their solutions but they didnt help. Can someone spot the thing that I did wrong or what I should add? The code is below, reads certain values from a json file and stores them in the GUI table. I am using PyQt4 and python 2.7. Thank you in advance.

import sys
from PyQt4 import QtCore, QtGui
import time
from PyQt4.QtGui import QApplication
import json
import threading

from GUI_Window import *
LastCommandTime=0

class MyForm(QtGui.QMainWindow):
def __init__(self, parent=None):
QtGui.QWidget.__init__(self, parent)
self.ui = Ui_MainWindow()
self.ui.setupUi(self)
self.ui.button.clicked.connect(self.DataCollection )
def DataCollection(self):
print "button clicked"
task1=threading.Thread(target=self.DisplayCommand)
task1.start()
task2=threading.Thread(target=self.DisplayTemp)
task2.start()
task1.join()
task2.join()
def DisplayCommand(self):
start=time.time()
with open("20170602153617003.log") as f:
for line in f:
data = []
data=json.loads(line)
try:
if data['TYPE']== " cmd":
command= data["command"]
print "1"
self.ui.command_table.setItem(0,0, QtGui.QTableWidgetItem(command["cmd_name"]))
self.ui.command_table.setItem(0,1, QtGui.QTableWidgetItem(command["opcode"]))
self.ui.command_table.setItem(0,2, QtGui.QTableWidgetItem("".join((str(x)+',') for x in command["param_type_list"])))
self.ui.command_table.setItem(0,3, QtGui.QTableWidgetItem("".join((str(x)+',') for x in command["param_val_list"])))
self.ui.commands_time.display((time.time()-start))
start=time.time()
time.sleep(1)
if data['TYPE']== " cmd_reply":
command= data["response"]
self.ui.reply_table.setItem(0,0, QtGui.QTableWidgetItem(data["cmd_name"].replace(" ","")))
self.ui.reply_table.setItem(0,1, QtGui.QTableWidgetItem("0x%02x"%command["opcode"]))
self.ui.reply_table.setItem(0,2, QtGui.QTableWidgetItem(str(command["error_control_type"])))
self.ui.reply_table.setItem(0,3, QtGui.QTableWidgetItem(str(command["data_present"])))
self.ui.reply_table.setItem(0,4, QtGui.QTableWidgetItem(str(command["command_reply"])))
self.ui.reply_table.setItem(0,5, QtGui.QTableWidgetItem(str(command["status_flags"])))
self.ui.reply_table.setItem(0,6, QtGui.QTableWidgetItem(str(command["condition_code"])))
self.ui.reply_table.setItem(0,7, QtGui.QTableWidgetItem(str(command["data_length"])))
self.ui.reply_table.setItem(0,8, QtGui.QTableWidgetItem(str(command["data"])))
self.ui.reply_table.setItem(0,9, QtGui.QTableWidgetItem(str(command["error_control"])))
flags=command['flags']
self.ui.replyflg_table.setItem(0,0, QtGui.QTableWidgetItem(str(flags["BOOT_FAIL"])))
self.ui.replyflg_table.setItem(0,1, QtGui.QTableWidgetItem(str(flags["BOOT_SOURCE"])))
self.ui.replyflg_table.setItem(0,2, QtGui.QTableWidgetItem(str(flags["COMM_SIDE"])))
self.ui.replyflg_table.setItem(0,3, QtGui.QTableWidgetItem(str(flags["SELF_TEST_FAIL"])))
self.ui.replyflg_table.setItem(0,4, QtGui.QTableWidgetItem(str(flags["STA_ERROR"])))
self.ui.replyflg_table.setItem(0,5, QtGui.QTableWidgetItem(str(flags["SPECTROMETER_ERROR"])))
self.ui.replyflg_table.setItem(0,6, QtGui.QTableWidgetItem(str(flags["SCCD_READY"])))
self.ui.replyflg_table.setItem(0,7, QtGui.QTableWidgetItem(str(flags["SCANNER_ON"])))
self.ui.replyflg_table.setItem(0,8, QtGui.QTableWidgetItem(str(flags["SCANNER_COMM_ERROR"])))
self.ui.replyflg_table.setItem(0,9, QtGui.QTableWidgetItem(str(flags["SCANNER_HOME_ERROR"])))
self.ui.replyflg_table.setItem(0,10, QtGui.QTableWidgetItem(str(flags["ERROR_LOG_NOT_EMPTY"])))
self.ui.replyflg_table.setItem(0,11, QtGui.QTableWidgetItem(str(flags["SEND_EVR"])))
self.ui.replyflg_table.setItem(0,12, QtGui.QTableWidgetItem(str(flags["SYS_ERROR"])))
self.ui.replyflg_table.setItem(0,13, QtGui.QTableWidgetItem(str(flags["UNDEFINED0"])))
self.ui.replyflg_table.setItem(0,14, QtGui.QTableWidgetItem(str(flags["UNDEFINED1"])))
time.sleep(.1)
except KeyError:
time.sleep(.1)
pass
QApplication.processEvents()

def DisplayTemp(self):
i=0
while i<10:
print "hi"
self.ui.flt_table.setItem(0,0, QtGui.QTableWidgetItem(str(i)))
i=i+1
QApplication.processEvents()
time.sleep(.2)




if __name__ == "__main__":
app = QtGui.QApplication(sys.argv)
myapp = MyForm()
graphTimer = QtCore.QTimer()
graphTimer.timeout.connect(app.processEvents)
graphTimer.start(0.1)
myapp.show()
sys.exit(app.exec_())

Also it appears that if I comment out the DisplayTemp() then it works just fine. I was thinking that the number of threads might be causing trouble but I am not sure how to fix it.