Hotel, Room, Booking classes in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the Hotel class with a name attribute.

LLD

class Hotel:
    def __init__(self, [1]):
        self.name = name

Drag options to blanks, or click blank then click option'

Alocation

Bbooking

Cname

Drooms

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong parameter name like location or rooms instead of name.

The constructor of the Hotel class should take the hotel name as a parameter and assign it to self.name.

2fill in blank

medium

Complete the code to add a method in Room class that returns the room number.

LLD

class Room:
    def __init__(self, number):
        self.number = number

    def get_[1](self):
        return self.number

Drag options to blanks, or click blank then click option'

Aprice

Btype

Cavailability

Dnumber

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the method incorrectly like get_price or get_type.

The method should be named get_number to return the room number.

3fill in blank

hard

Fix the error in Booking class constructor to correctly assign the room and guest.

LLD

class Booking:
    def __init__(self, room, guest):
        self.room = [1]
        self.guest = guest

Drag options to blanks, or click blank then click option'

Aself.guest

Broom

Cself.room

Dguest

Attempts:

3 left

💡 Hint

Common Mistakes

Assigning guest to self.room by mistake.

The constructor should assign the parameter room to self.room. Using guest here is incorrect.

4fill in blank

hard

Fill both blanks to create a method in Hotel class that adds a Room object to its rooms list.

LLD

class Hotel:
    def __init__(self, name):
        self.name = name
        self.rooms = []

    def add_room(self, [1]):
        self.rooms.[2](room)

Drag options to blanks, or click blank then click option'

Aroom

Brooms

Cappend

Dadd

Attempts:

3 left

💡 Hint

Common Mistakes

Using rooms as parameter or add instead of append.

The method parameter should be room and the list method to add an item is append.

5fill in blank

hard

Fill all three blanks to create a method in Booking class that checks if the booking is for a specific room number.

LLD

class Booking:
    def __init__(self, room, guest):
        self.room = room
        self.guest = guest

    def is_for_room(self, [1]):
        return self.room.[2] == [3]

Drag options to blanks, or click blank then click option'

Aroom_number

Bnumber

Dguest

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong parameter names or comparing with guest instead of room number.

The method parameter should be room_number. The room's attribute to check is number. Compare it to the room_number parameter.

Practice

1. Which class is primarily responsible for storing information about individual rooms in a hotel system?

easy

A. Room

B. Hotel

C. Booking

D. Guest

Solution

1. Step 1: Understand the role of each class

   The Hotel class manages the overall hotel, Booking handles reservations, and Room stores details about each room.

2. Step 2: Identify which class holds room details

   Since Room is designed to represent individual rooms, it stores room number, type, and availability.

3. Final Answer:

   Room -> Option A

4. Quick Check:

   Room class = stores room info [OK]

Hint: Room class holds room details, not Hotel or Booking [OK]

Common Mistakes:

• Confusing Hotel with Room class
• Thinking Booking stores room details
• Assuming Guest class stores room info

2. Which of the following is the correct way to represent a Booking class constructor in Python that takes room, guest, and date as parameters?

easy

A. def __init__(self, room, guest, date):

B. def Booking(room, guest, date):

C. def __booking__(self, room, guest, date):

D. def init(self, room, guest, date):

Solution

1. Step 1: Recall Python constructor syntax

   Python constructors use the special method __init__ with self as the first parameter.

2. Step 2: Match the correct method signature

   def __init__(self, room, guest, date): correctly uses def __init__(self, room, guest, date): which is the standard constructor format.

3. Final Answer:

   def __init__(self, room, guest, date): -> Option A

4. Quick Check:

   Constructor = __init__ method [OK]

Hint: Python constructors always use __init__(self, ...) [OK]

Common Mistakes:

• Using method name other than __init__
• Omitting self parameter
• Using class name as method name

3. Given the following code snippet, what will be the output?

class Room:
    def __init__(self, number):
        self.number = number
        self.is_available = True

class Booking:
    def __init__(self, room):
        self.room = room
        self.room.is_available = False

room101 = Room(101)
print(room101.is_available)
booking1 = Booking(room101)
print(room101.is_available)

medium

A. True\nTrue

B. False\nTrue

C. False\nFalse

D. True\nFalse

Solution

1. Step 1: Check initial availability of room101

   When room101 is created, is_available is set to True, so first print outputs True.

2. Step 2: Booking changes room availability

   Booking constructor sets room101.is_available to False, so second print outputs False.

3. Final Answer:

   True\nFalse -> Option D

4. Quick Check:

   Initial True, then set False by Booking [OK]

Hint: Booking sets room availability to False immediately [OK]

Common Mistakes:

• Assuming availability stays True after booking
• Confusing order of prints
• Ignoring side effect on room object

4. Identify the error in the following Booking class code snippet:

class Room:
    def __init__(self, number):
        self.number = number
        self.is_available = True

class Booking:
    def __init__(self, room, guest):
        self.room = room
        self.guest = guest
    def book(self):
        if self.room.is_available:
            self.room.is_available = False
            print("Booking successful")
        else:
            print("Room not available")

room = Room(201)
booking = Booking(room)
booking.book()

medium

A. is_available should be a method, not attribute

B. Missing guest argument when creating Booking instance

C. book method should return a value

D. Room class is not defined

Solution

1. Step 1: Check Booking constructor parameters

   Booking __init__ requires room and guest, but only room is passed when creating booking instance.

2. Step 2: Identify missing argument error

   Omitting guest argument causes a TypeError at runtime.

3. Final Answer:

   Missing guest argument when creating Booking instance -> Option B

4. Quick Check:

   Constructor args mismatch = missing guest [OK]

Hint: Match all constructor parameters when creating objects [OK]

Common Mistakes:

• Ignoring missing guest argument
• Assuming book method must return value
• Thinking is_available must be a method

5. You want to design a system where a Hotel manages multiple Rooms and allows Bookings only if rooms are available. Which design approach best supports scalability and maintainability?

hard

A. Make Booking class manage all Rooms and Guests directly, without Hotel involvement.

B. Store all booking data inside Room class only, without separate Booking class.

C. Have Hotel class contain a list of Room objects, and Booking class references Room and Guest; Hotel checks availability before booking.

D. Use a single class combining Hotel, Room, and Booking functionalities.

Solution

1. Step 1: Analyze class responsibilities

   Hotel should manage Rooms, Booking should link Rooms and Guests, keeping clear separation.

2. Step 2: Evaluate design for scalability

   Have Hotel class contain a list of Room objects, and Booking class references Room and Guest; Hotel checks availability before booking. cleanly separates concerns, allowing Hotel to check availability and Booking to handle reservations, supporting easy maintenance and scaling.

3. Final Answer:

   Hotel manages Rooms; Booking references Room and Guest; Hotel checks availability -> Option C

4. Quick Check:

   Separation of concerns = Have Hotel class contain a list of Room objects, and Booking class references Room and Guest; Hotel checks availability before booking. [OK]

Hint: Separate Hotel, Room, Booking roles for clean design [OK]

Common Mistakes:

• Combining all logic in one class
• Booking managing Rooms directly
• Ignoring availability checks in Hotel