Added composition

Projects/oop_demo/learning/institute/structure.py

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+"""This module defines the basic structures necessary
+"""
+
+
+class Course:
+    """This represents Course"""
+
+    def __init__(self, course_id: str, name: str) -> None:
+        self.__course_id = course_id
+        self.__name = name
+
+    @property
+    def name(self):
+        """This property returns name"""
+        return self.__name
+
+    @property
+    def course_id(self):
+        """Course Id propert"""
+        return self.__course_id
+
+
+class Student:
+    """
+    This class Represents the student
+    """
+
+    def __init__(
+        self,
+        student_id: str,
+        name: str,
+    ) -> None:
+        self.student_id = student_id
+        self.name = name
+        self.courses = []
+
+    def enroll_course(self, course: Course):
+        """We are enrolling student to a course"""
+        self.courses.append(course)

Projects/oop_demo/tests/institute/test_structures.py

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+"""
+This test cases test the institute structures
+"""
+from learning.institute.structure import Course, Student
+
+def test_student_course():
+    """Testing the basic functionality
+    """
+    python_course = Course(
+        "x123",
+        "Python"
+    )
+    devops_course = Course(
+        "x121",
+        "DevOps"
+    )
+    cloud_course = Course(
+        "x121",
+        "DevOps"
+    )
+    student = Student(
+        student_id = "s1001",
+        name = "Abhay"
+    )
+
+    assert len(student.courses) == 0
+    # now lets enroll student to python
+    student.enroll_course(python_course)
+    assert len(student.courses) == 1
+    student.enroll_course(devops_course)
+    assert len(student.courses) == 2
+    student.enroll_course(cloud_course)
+    assert len(student.courses) == 3