$2.$ In a file student.py create class definitions as indicated below.

a$.$ Define a class called Student with instance variables for the student ID $($int$),$ student's name, gpa $($ a number between $0$ and $100,$ displayed as float rounded to $1$ decimal place$)$ and courses $($ the number courses used for gpa calculation$)$ and. When creating an instance of the class, default values of 'unknown' $0\mathrm{.}0$

COMP $2087$: Programming for Beginners II

Assignment $\backslash$#$3$

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and $0$ can be used for name, gpa and num$\_$courses respectively; but the studentID must be specified. All instance variables should be considered 'private'

b$.$ Write the following methods for this class:

i$.$ init $()\backslash$# create and parameters

ii$.$ getCourses $()\backslash$# returns current value for number of courses

iii. add$\_$mark $()\backslash$# user specifies a course mark $($int between $0$ and $100)$ to be included in the gpa calculation. Note: value of courses must be incremented as well when a mark is added, but cannot be more than $40.$ If the gpa is already based on $40$ courses, a suitable message should be displayed to the user. The function returns the gpa for the student $($after any update$).$

iv$.$ del$\_$mark $()\backslash$# user specifies a course mark $($int between $0$ and $100)$ to be excluded from the gpa calculation. Note: value of courses must be decremented as well, but cannot be less than $0.$ If the current gpa is based on $0$ courses, a suitable message should be displayed to the user.

v$.$ str $()\backslash$# shows info in format: studentID$($name$)$: gpa.

c$.$ Define $\backslash (\backslash$overline$\{\backslash$mathrm$\{$a$\}\}\backslash$underline$\{$s u b c l a s s$\}\backslash )$ of Student called GradStudent, which has another instance variable called $\_$extra, that specifies the number of additional courses $($above $40)$ that the student is allowed to take. The default value is $10.$

d$.$ Override the add$\_$mark $()$ method of the parent class. If current value of courses is $\backslash (\backslash$boldsymbol$\{$c$\}\backslash ),$ the new add$\_$mark method does the following:

i$.$ If $\backslash (\backslash$boldsymbol$\{$c$\}<mi>\backslash </mi>$mathbf$\{40\}\backslash )$ then new balance is updated regularly.

ii$.$ Otherwise, if $\backslash ($ c extra then the new mark is used calculate the updated gpa and a warning message is printed indicating how many extra courses the student has added.

iii. Otherwise, gpa update is not allowed, and a suitable message is printed.