TypeError: 'NoneType' object does not support item assignment

def handleEnterEvent(event):
    label1['text'] = "You enter the frame"
    label2['text'] = ""
    label3['text'] = "Sichuan University of Science and Engineering"
label1 = tkinter.Label(frame1, text="No event happened", foreground="#0000ff", background="#00ff00").place(x=16, y=20)

 File "/Users/2020yang/Desktop/Python/Python_Basic/excise/GUI/ex1/tkinter_key.py", line 11, in handleLeaveEvent

    label1['text'] = "You leave the frame"

TypeError: 'NoneType' object does not support item assignment


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