🎯 Objective

To design a simple University Portal System using Object-Oriented Programming concepts in Python, demonstrating:

• Constructor usage
• Inheritance
• Encapsulation
• Method Overriding
• Polymorphism

📌 Problem Statement

You are required to build a University Portal System where different types of users (Students and Teachers) can log in and access their information.

The system should be designed using a base class User and two derived classes:

• Student
• Teacher

Each user type should have its own login behavior and protected data.

🏗️ Requirements

🔷 1. Base Class: User

Create a class User with the following:

Attributes:

• name
• email (private → encapsulation)
• password (private → encapsulation)

Constructor:

Initialize all attributes using __init__()

Methods:

• login(email, password) → default login method
• show_info() → display user information (except password)

🔷 2. Subclass: Student

Inherits from:

• User

Additional Attributes:

• roll_no
• program

Methods:

• Override login() method:

  • Show message: "Student login successful"
  • Validate email and password

• Override show_info():

  • Display student details

🔷 3. Subclass: Teacher

Inherits from:

• User

Additional Attributes:

• teacher_id
• department

Methods:

• Override login() method:

  • Show message: "Teacher login successful"
  • Validate email and password

• Override show_info():

  • Display teacher details

🔐 Encapsulation Requirement

• Email and password must be private attributes

• Access them only through:

  • Getter methods (optional)
  • Internal class methods

👉 Students should NOT access email or password directly.

🔁 Polymorphism Requirement

Create a function:

def portal_login(user, email, password):
    user.login(email, password)

👉 This function should work for both:

• Student object
• Teacher object

✔ Same method name (login()) ✔ Different behavior depending on object type

🧾 Sample Input/Output

Example 1: Student Login

Student login successful
Welcome: Ali Ahmed
Roll No: 23
Program: BSCS

Example 2: Teacher Login

Teacher login successful
Welcome: Dr. Khan
Department: Computer Science
Teacher ID: T-102

💻 Expected Implementation Structure

Students should use:

• __init__() constructor
• super() to call parent constructor
• Method overriding in both subclasses
• Private variables for encapsulation
• Polymorphism through function call

⭐ Bonus Features (Optional for Extra Marks)

• Add login validation:

  • If email/password is wrong → show "Invalid credentials"

• Add logout() method

• Store multiple users in a list and loop login attempts

🧪 Evaluation Criteria (Marks Distribution)