Python+pygtk doubt

[nipunreddevil]

i have been trying to connect my gui to serial port,but the result is first serial port code runs and then the gui.
I want the gui to readily update the value after receiving new content from serial port.
Here is my code:

#!/usr/bin/env python


#Program to show text entries

import pygtk
pygtk.require('2.0')
import gtk
import serial
import re


class Entry:
def enter_callback(self,widget,entry):
entry_text=entry.get_text()
print"Entry contents%s\n"%entry_text
def entry_toggle_editable(self,checkbutton,entry):
entry.set_editable(checkbutton.get_active())
def entry_toggle_visibility(self,checkbutton,entry):
entry.set_visibility(checkbutton.get_active())
def __init__(self):
window=gtk.Window(gtk.WINDOW_TOPLEVEL)
window.set_size_request(200,100)
window.set_title("Entry")
window.connect("delete_event",lambda w,e:gtk.main_quit())

vbox=gtk.VBox(False,0)
window.add(vbox)
vbox.show()

label1=gtk.Label("Information")

entry=gtk.Entry()
entry.set_max_length(50)
entry.connect("activate",self.enter_callback,entry)
entry.set_text(alpha.var1)
vbox.pack_start(label1,True,True,2)
vbox.pack_start(entry,True,True,2)
label1.show()
entry.show()

hbox=gtk.HBox(False,0)
vbox.add(hbox)
hbox.show()

check = gtk.CheckButton("Editable")
hbox.pack_start(check, True, True, 0)
check.connect("toggled", self.entry_toggle_editable, entry)
check.set_active(True)
check.show()

check = gtk.CheckButton("Visible")
hbox.pack_start(check, True, True, 0)
check.connect("toggled", self.entry_toggle_visibility, entry)
check.set_active(True)
check.show()

button = gtk.Button(stock=gtk.STOCK_CLOSE)
button.connect("clicked", lambda w: gtk.main_quit())
vbox.pack_start(button, True, True, 0)
button.set_flags(gtk.CAN_DEFAULT)
button.grab_default()
button.show()
window.show()

class alpha:
ser=serial.Serial()
ser.port="/dev/ttyUSB0"
ser.baudrate=9600
ser.open()
i=0
g=open('/home/nipun/1.txt','r+')
vars = re.compile('^(\d+\.?\d*)a(\d+\.?\d*)b(\d+\.?\d*)c( \d+\.?\d*)d(.*)')

s=ser.readline()
print s
g.write(s)
g.write("\n")
print "\n"
m = re.search(vars, s) # Run the regexp on the packet
var1 = m.group(1) # take out the values
var2 = m.group(2)
var3 = m.group(3)
var4 = m.group(4)
print var1,"\n"



def main():
gtk.main()
return 0

if __name__ == "__main__":
Entry()
main()