Provide a method def undo that simulates such a button

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Question

1. We want to add a button to the tally counter in Section 9.2 that allows an operator to undo accidental button click. Provide a method def undo(self) that simulates such a button. As an added precaution, make sure an undo doesn't cause the counter to be less than zero.

a) Your code with comments

b) A screenshot of the execution

Test Case:

Reset

2 clicks

Print Value

1 click

Print Value

2 undos

Print Value

2 undos

Print Value

Reference no: EM132354067

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