class Course: """ A University Course

=== Public Attributes === name: the name of the course students: a list of students enrolled in the course

=== Representation Invariants === - No two students in this course have the same id - name is not the empty string """

name: str students: List[Student]

def __init__(self, name: str) -> None: """ Initialize a course with the name of . """ self.name = name self.list = students

def enroll_students(self, students: List[Student]) -> None: """ Enroll all students in in this course.

If adding any student would violate a representation invariant, do not add any of the students in to the course. """

I just wanna know what does 'violate a representation invariant' mean?(using Python 3.8 for this question) How should I construct my code in the method "enroll_students"? Thank you.