QUESTION

$1.$ You are required to create a Python class named Student that models a student. The class should have the following attributes and methods:

a$.$ Attributes:

i$.$ name : A string representing the student's name.

ii$.$ student$\_$id: An integer representing the student's unique identification number.

iii. courses: A list of strings representing the courses the student is enrolled in$.$

iv$.$ grades: A dictionary where the keys are course names and the values are the grades the student has received in those courses.

b$.$ Methods:

i$.\_\_$init$\_($self$,$ name: str$,$ student$\_$id: int$)$: Initializes a new Student object with the provided name and student ID$.$ The courses list should be empty, and the grades dictionary should be empty when a student object is created.

ii$.$ enroll$($self$,$ course$\_$name: str$)$: Enrolls the student in a new course by adding the course name to the courses list. If the student is already enrolled in the course, the method should do nothing.

iii. add$\_$grade$($self$,$ course$\_$name: str$,$ grade: float$)$: Adds a grade for a specific course to the grades dictionary. If the student is not enrolled in the course, the method should raise a ValueError with the message "Student is not enrolled in the course.".

iv$.$ get$\_$gpa$($self$)$: Calculates and returns the student's GPA as the average of all grades in the grades dictionary. If the student has no grades, the method should return None.

v$.$ str$($self$)$: Returns a string representation of the Student object in the format: "Student Name: $,$ ID: $,$ Courses: $".$

$\backslash$# Creating a new student

student $=$ Student $("$Alice$",1234)$

$\backslash$# Enrolling the student in courses