Update polymorphism.py

polymorphism.py

@@ -1,11 +1,47 @@
 class Student:
-    # Delete this and write your code here
-    pass
+    def __init__(self, name, major, gpa_for_semesters):
+        self.name = name
+        self.major = major
+        self.__gpa_for_semesters = gpa_for_semesters  # Private attribute
+
+    def __str__(self):
+        return f"{self.name} is studying {self.major}."
+
+    # Encapsulation: controlled access to GPA data
+    def get_gpa(self):
+        return self.__gpa_for_semesters
+
+    def set_gpa(self, new_value):
+        self.__gpa_for_semesters = new_value
+
+    def calculate_average_gpa(self):
+        if not self.__gpa_for_semesters:
+            return 0.0
+        return sum(self.__gpa_for_semesters) / len(self.__gpa_for_semesters)
+
+    def is_in_good_standing(self):
+        print(f"{self.name} is a student.")
+
 
 class UndergraduateStudent(Student):
-    # Delete this and write your code here
-    pass
+    def __str__(self):
+        return f"{self.name} is an undergraduate student studying {self.major}."
+
+    def is_in_good_standing(self):
+        avg_gpa = self.calculate_average_gpa()
+        if avg_gpa >= 2.5:
+            print(f"{self.name} is in good academic standing.")
+        else:
+            print(f"{self.name} is not in good academic standing.")
+
 
 class GraduateStudent(Student):
-    # Delete this and write your code here
-    pass
+    def __str__(self):
+        return f"{self.name} is a graduate student studying {self.major}."
+
+    def is_in_good_standing(self):
+        avg_gpa = self.calculate_average_gpa()
+        if avg_gpa >= 3.0:
+            print(f"{self.name} is in good academic standing.")
+        else:
+            print(f"{self.name} is not in good academic standing.")