Why am I getting an AttributeError for 'summary_output' in my Tkinter DES class?

Why am I getting an AttributeError for 'summary_output' in my Tkinter DES class?

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Why am I getting an AttributeError for 'summary_output' in my Tkinter DES class?
Why am I getting an AttributeError for 'summary_output' in my Tkinter DES class?
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