forget.py

from tkinter import *

root = Tk()
root.title('Codemy.com - Learn To Code!')
root.iconbitmap('c:/gui/codemy.ico')
root.geometry("400x400")

def myDelete():
	#myLabel.pack_forget()
	myLabel.destroy()
	myButton['state'] = NORMAL
	print(myButton.winfo_exists())

def myClick():
	global myLabel
	hello = "Hello " + e.get()
	myLabel = Label(root, text=hello)
	e.delete(0, 'end')
	myLabel.pack(pady=10)
	myButton['state'] = DISABLED

e = Entry(root, width=50, font=('Helvetica', 30))
e.pack(padx=10, pady=10)

myButton = Button(root, text="Enter Your Name", command=myClick)
myButton.pack(pady=10)

DeleteButton = Button(root, text="Delete Text", command=myDelete)
DeleteButton.pack(pady=10)


root.mainloop()