Как сохранить принятое сообщение в Tkinter.Text()?

# -*- coding: cp1251 -*-
#!/usr/bin/env python
# -*- coding: utf-8 -*-
from Tkinter import *
import socket
import threading
 
sock = socket.socket()
sock.bind(('', 9999))
sock.listen(10)
conn, addr = sock.accept()
 
root = Tk()
root.title("MiniChat-Server")
root.geometry('300x435+300+200')
 
nick=' '
temp=': '
def Exit():
    root.destroy()
 
def ReadMsg():
    while True:
        msg = conn.recv(1024)
        text1.insert(1.0,msg)
 
def SendMsg():
    while True:
        nick = ent.get()
        msg = text2.get(1.0, END)
        if(nick==""):
            root.destroy()
        text2.delete(1.0,END)
        text1.insert(1.0,nick+temp+msg)
        str(msg)
        conn.send(msg)
 
t1 = threading.Thread(target=ReadMsg,)
t2 = threading.Thread(target=SendMsg,)
 
t1.start()
t2.start()
 
t1.join()
t2.join()
 
lab = Label(root,text="Имя пользователя", font="Verdana 8",fg="blue")
but1 = Button(root,text="Exit!", width=10,height=1,bg="yellow",fg="blue",command=Exit)
lab1 = Label(root,text="Сообщения:", font="Verdana 8",fg="blue")
ent = Entry(root,width=20,bd=3)#nick
text1 = Text(root,width=41,height=15,font="Verdana 8",wrap=WORD,bg="yellow",fg="red")
text2 = Text(root,width=41,height=5,font="Verdana 8",wrap=WORD,bd=3)
but2 = Button(root,text="Отправить!",width=40,height=1,bg="yellow",fg="blue",command=SendMsg)
lab2 = Label(root,text="Отправить сообщение:", font="Verdana 8",fg="blue")
 
lab.place(x=1,y=1)
ent.place(x=4,y=20)
lab1.place(x=1,y=50)
but1.place(x=150,y=16)
text1.place(x=4,y=70)
text2.place(x=3,y=300)
lab2.place(x=1,y=275)
but2.place(x=4,y=400)
 
root.mainloop()

Exception in thread Thread-1:
Traceback (most recent call last):
  File "C:\Python27\lib\threading.py", line 808, in __bootstrap_inner
    self.run()
  File "C:\Python27\lib\threading.py", line 761, in run
    self.__target(*self.__args, **self.__kwargs)
  File "D:/����/�������Y�����/Python/tkinter/mini_chat.py", line 25, in ReadMsg
    text1.insert(1.0,msg)
NameError: global name 'text1' is not defined

def ReadMsg():
    while True:
        global text1
        msg = conn.recv(1024)
        text1.insert(1.0,msg)