assingment-2.py

students = {}
logged_user = ''
logged = False


def register():
    global students
    print("\n===== Student Registration =====")
    username = input("Enter username: ")
    
    if username in students:
        print("Username already exists! Try logging in.")
        return

    password = input("Enter password: ")
    name = input("Enter full name: ")
    age = input("Enter age: ")
    gender = input("Enter gender (M/F/Other): ")
    email = input("Enter email: ")
    phone = input("Enter phone number: ")
    address = input("Enter address: ")
    course = input("Enter course name: ")
    year = input("Enter academic year: ")
    roll_no = input("Enter roll number: ")
    department = input("Enter department: ")

    students[username] = {
        'password': password,
        'name': name,
        'age': age,
        'gender': gender,
        'email': email,
        'phone': phone,
        'address': address,
        'course': course,
        'year': year,
        'roll_no': roll_no,
        'department': department
    }

    print(f"\nRegistration successful! Welcome, {name}.")


def login():
    global logged_user, logged
    print("\n===== Student Login =====")
    username = input("Enter username: ")
    password = input("Enter password: ")

    if username in students and students[username]['password'] == password:
        logged_user = username
        logged = True
        print(f"\nLogin successful! Welcome, {students[username]['name']}.")
    else:
        print("Invalid username or password.")


def show_profile():
    global logged_user, logged
    
    if not logged:
        print("You must log in first!")
        return

    print("\n===== Student Profile =====")
    profile = students[logged_user]

    for key, value in profile.items():
        if key != 'password':
            print(f"{key.capitalize()}: {value}")


def update_profile():
    global logged_user, logged
    
    if not logged:
        print("You must log in first!")
        return

    print("\n===== Update Profile =====")
    profile = students[logged_user]

    print("Leave blank to keep current value.\n")

    for field in profile:
        if field == 'password':
            continue

        new_value = input(f"Enter new {field} (current: {profile[field]}): ")
        if new_value.strip():
            profile[field] = new_value

    students[logged_user] = profile
    print("\nProfile updated successfully!")


def logout():
    global logged_user, logged
    
    if not logged:
        print("No user currently logged in.")
        return

    print(f"User '{logged_user}' logged out successfully.")
    logged_user = ''
    logged = False


def terminate():
    print("\nThank you for using the LNCT Student System. Goodbye!")
    exit()


def main():
    print("\n===== Welcome to LNCT Student Management System =====")
    
    while True:
        response = input('''
Choose an option:
1. Registration
2. Login
3. Show Profile
4. Update Profile
5. Logout
6. Main Menu
7. Exit
Select option (1-7): ''')

        if response == '1':
            register()
        elif response == '2':
            login()
        elif response == '3':
            show_profile()
        elif response == '4':
            update_profile()
        elif response == '5':
            logout()
        elif response == '6':
            continue
        elif response == '7':
            terminate()
        else:
            print("Invalid choice. Please try again.")


if __name__ == "__main__":
    main()