1. We want to add a button to the tally counter in Section 9.2 that allows an operator to undo an 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. 5 pts 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

See explaination

Explanation:

class Counter:

def getValue(self):

return self._value

def undo(self):

if self._value > 0:

self._value = self._value - 1;

def click(self):

self._value= self._value + 1

def reset(self):

self._value= 0

tally= Counter()

tally.reset()

tally.click()

tally.click()

result = tally.getValue()

print("Value:", result)

tally.click()

result = tally.getValue()

print("Value:", result)

tally.undo()

tally.undo()

result = tally.getValue()

print("Value:", result)

tally.undo()

tally.undo()

result = tally.getValue()

print("Value:", result)

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yes we can change both the color of the value of a cell as well as background color of a cell at the same time .

as we know that excel sheet consists of columns and rows.

and intersection of column and row is called cell.

we can change color of the cell and background of the cell at the same time.

hence the statement that

can a person change color of the cell and background of the cell at the same time is true.