newWindow: this function should be called when 'New Window' option is selected from the menu choices. This function should create a new window of size $600$ by $600$ pixels with a white background and a window title $($New Window Created$),$ similar to the screenshot below. openFile: this function should open a file selection dialog box to allow users to select a

file from their local directory. Once a file is selected, this function can be used to call all

other functions to process the gradebook, including the legacy functions $($readFromFile$,$

computeStudentAverage, compute ClassAverage, computeLetterGrade$)$ and the new

functions $($createTable and createGraph$).$ createTable: on selection of a $.$csv file, this function should generate a table to display

the gradebook file selected by the user. The gradebook should look similar to the

following screenshot, except that the number of students and grades can vary. Note that

only part of the picture with table is relevant to this function. Feel free to use Tkinter

grid to design table.

createGraph: this function should be used to design a pi$-$chart to show grade distribution

for the course. The pi$-$chart must use different colors to show grade percentages for

different letter grades $($A$,$ B $,$ C $,$ D$,$ & F$).$ This function should also design a legend box to

indicate the color boxes represented for the five different colors. The pi$-$chart and the

legend box should look similar to the one shown in the above screenshot.

main: this function should be used to call all other functions.

Selecting 'Exit Program' from the menu option should close$/$destroy$/$dismiss the window

interface.

No implementation is needed for the 'Save File' and 'Print' menu options.Using existing code, design GUI as described