def gt():
    global e
    string = e.get()
    print(string)
def p():
    b.destroy()
    c.destroy()
    w = Label(top, text="here are what you can use:")
    w1 = Label(top, text="qwertyuiop[]asdfghjkl;zxcvbnm,./QWERTYUIOPASDFGHJKLZXCVBNM123456789")
    w.pack()
    w1.pack()
    L1 = Label(top, text="give me the password")
    L1.pack( side = LEFT)
    e=Entry(top)
    e.pack()
    r = Button(top,text='okay',command=gt)
    r.pack(side='bottom')
    top.mainloop()

Traceback (most recent call last):
  File "C:Python33libidlelibrun.py", line 121, in main
    seq, request = rpc.request_queue.get(block=True, timeout=0.05)
  File "C:Python33libqueue.py", line 175, in get
    raise Empty
queue.Empty

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:Python33libtkinter__init__.py", line 1475, in __call__
    return self.func(*args)
  File "C:UsersHadiDesktopt.py", line 51, in gt
    string = e.get()
NameError: global name 'e' is not defined