[issue44076] issue with list in Python 3.8.5

[Mohamed]

Mohamed <allawatimr at gmail.com> added the comment:

Please find attached, the demo with dummy data. As I mentioned, it was working fine until May 1st. 
Also, As I mentioned, in case I call MasterApp at the end of add function data appears correctly. This means a malfunction occurred after Windows Update, and it relates to mainloop

    class MasterApp(object):
        def __init__(self, root):
        ....

        def fun_astinfo_add(self):
	    ...
	    assetinfo_lst.append(lst_values)
	    ...
	    MasterApp(root)

        ...
    if __name__ == "__main__":
        root = Tk()
        App = MasterApp(root)
        root.mainloop()

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Added file: https://bugs.python.org/file50030/Issue in Tkinter with Python 2.pdf

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<https://bugs.python.org/issue44076>
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