如何从Tkinter中的文本框中清除文本Python 3.6

Question

我在删除'labelresult'文本框中的文本时遇到问题。我试图使用我在Stack Overflow上找到的一些解决方案，但它们不起作用。任何帮助都将很高兴。

from tkinter import *
from random import randint

def encrypt():
    encrypted = ""
    encCode1 = str(encCode.get())
    try:
        encNum1 = int(encNum.get())
    except ValueError:
        labelresult = Label(myGUI, text="You did not use a number please try again").grid(row=7, column=2)
    if (encNum1 == 0):
        encNum1 = randint(-38,4)
    for letter in encCode1:
        if letter == " ":
            encrypted += " "
        else:
            encrypted += chr(ord(letter)+encNum1)
    labelresult = Label(myGUI, text=encrypted).grid(row=7, column=2)

myGUI=Tk()
myGUI.geometry("700x300")
myGUI.title("Encrypter/Decrypter")

encCode=StringVar()
encNum=StringVar()

label1=Label(myGUI,text="Use the two boxes under this text to Encrypt", fg="red").grid(row=0,column=2)
label2=Label(myGUI,text="Enter the code to be encrypted").grid(row=2,column=0)
label3=Label(myGUI,text="Enter a number between -38 and 4 to encrypt with").grid(row=3,column=0)

myn=Entry(myGUI,textvariable=encCode).grid(row=2, column=2)
mys=Entry(myGUI,textvariable=encNum).grid(row=3, column=2)

button1=Button(myGUI,text="Calculate Encrypted Code",command=encrypt).grid(row=4,column=0)

myGUI.mainloop()