what happened with my code here, Python

explain to me plz

LE File Edit Format Run Options Window Help csc242lab4.py - /Users/halhindi/Downloads (csc2421ab4.py (3.9.7) from tkinter import Label, Tk class Sign (Tk): n3 def __init__(self, 1st= [], parent=None): ng 6 Tk.init__(self, parent) "he self.make_widgets() self.lst = lst def make_widgets(self): self.title("Warning") labell-Label(self, text= "GREAT DEAL!") label1.pack() label2-Label(self, text="Android 1.2 Phones for $10!") label2.pack) label3-Label(self, text= "Security Vulnerabilities Included!") label3.pack) if len(self. lst) --3: self.title( "Digital Sign") Text1 = str (self.lst[e]) Text2 = str (self.lst[1]) Text3 = str (self.lst (21) label1=Label(self, text=Texti) label1.pack() label2=Label(self, text=Text2) labe12.pack( label3=Label(self, text=Text3) label3.pack) self.make_widgets() File "/users/halhindi/Downloads/csc2421ab4.py", line 15, in make_widgets if len(self.lst)==3: File "/Library/Frameworks/Python. framework/Versions/3.9/lib/python3.9/tkinter/ _init__.py", line 2354, in--getattr__ return getattr(self.tk, attr) AttributeError: '_tkinter.tkapp' object has no attribute 'st' Pos >>> 2: Modify the Sign() class to take in an optional parameter of type list that has 3 sentences that can be displayed on the screen. If there aren't three items in the list, the the default message as shown in problem I will be displayed. Example usage: >>> lines=['line 1', 'line 2', 'line 3'] >>> Sign(lines) .mainloop() >>> Digital Sign 0 X line 1 line 2 line 3 >>Sign().mainloop() Warning GREAT DEAL! Android 1.0 Phones for $10! Security vulnerabilities included! >>> Ist=[] >>>Ist.append("The key to the lab is to add multiple labels") >>>Ist.append("This list will be stored in an instance variable") >>> Ist.append("The text property of the labels will be set to each of these message") >>> Sign(Ist).mainloop() Digital Sign The key to the lab is to add multiple labels This list will be stored in an instance variable The tot property of the labels will be set to each of these message