# Write a Program to Solve the Which House Puzzle in Python

June 20, 2024
Dr. David
🇦🇺 Australia
Python
Dr. David Adams, a distinguished Computer Science scholar, holds a PhD from the University of Melbourne, Australia. With over 5 years of experience in the field, he has completed over 300 Python assignments, showcasing his deep understanding and expertise in the subject matter.
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Key Topics
• Enhance Python Skills with Puzzle Solving
• Setting Up the Puzzle
• Validating the Puzzle State
• Solving the Puzzle with Backtracking
• Putting It All Together
• Conclusion

Our guide will walk you through the process of solving the 'Which House' puzzle using Python. By the end of this guide, you'll have a clear understanding of how to determine which house belongs to each person based on a set of clues. You'll gain valuable insights into logical problem-solving and learn to apply Python programming techniques to crack complex puzzles. Whether you're a beginner or an experienced coder, this guide will help sharpen your analytical skills and enhance your problem-solving abilities.

## Enhance Python Skills with Puzzle Solving

Explore our in-depth guide on solving the 'Which House' puzzle in Python, designed to assist you with your Python assignment and provide valuable programming resources to support your learning. Whether you're a beginner looking to grasp the fundamentals of Python or an experienced coder seeking to enhance your problem-solving skills, our guide offers a comprehensive pathway. We believe that learning programming should be an engaging and accessible journey, and our content is tailored to make your Python experience both enjoyable and rewarding.

## Setting Up the Puzzle

First, let's set up the puzzle by defining the elements involved. We have five houses, each with five attributes: color, nationality, drink, and pet. We'll create lists for each attribute's possible values.

``````python # Define lists for possible values of attributes houses = [1, 2, 3, 4, 5] colors = ["Red", "Green", "Blue", "Yellow", "White"] nationalities = ["Norwegian", "Englishman", "Spaniard", "Ukrainian", "Japanese"] drinks = ["Water", "Tea", "Coffee", "Milk", "Orange Juice"] pets = ["Dog", "Snails", "Fox", "Horse", "Zebra"] ``` ```

Next, we'll use a dictionary to represent the state of each house. Initially, all attributes for each house are set to `None`.

``````python # Initialize the state of each house houses_state = {house: {"Color": None, "Nationality": None, "Drink": None, "Pet": None} for house in houses} ``` ```

## Validating the Puzzle State

To ensure the validity of the puzzle state, we need a function that checks that no two houses share the same attribute of the same type, such as color or nationality.

``````python # Define a function to check if the current state is valid def is_valid(state): # Check if the same color is used for two different houses if len(set(state[house]["Color"] for house in houses if state[house]["Color"] is not None)) != len(houses): return False # Add similar checks for nationality, drink, and pet return True ``` ```

## Solving the Puzzle with Backtracking

To solve the puzzle, we'll use a function that employs the backtracking technique. This function attempts to assign attributes to houses one by one, backtracking if it encounters an invalid state.

``````python # Define a function to solve the puzzle using backtracking def solve_puzzle(state, house_index): # Check if we have assigned attributes to all houses if house_index == len(houses): return is_valid(state) # Try assigning each attribute to the current house and recursively solve the puzzle for color in colors: state[houses[house_index]]["Color"] = color if solve_puzzle(state, house_index + 1): return True state[houses[house_index]]["Color"] = None # Backtrack # Add similar loops for nationality, drink, and pet return False ``` ```

## Putting It All Together

With all the puzzle-solving elements in place, we'll call the `solve_puzzle` function to find the solution and print the results.

``````python # Call the solve_puzzle function to solve the puzzle if solve_puzzle(houses_state, 0): # Print the solution for house in houses: print(f"House {house}:") print(f"Color: {houses_state[house]['Color']}") # Add similar prints for nationality, drink, and pet print() else: print("No solution found.") ``` ```

## Conclusion

This guide equips you with the knowledge and code to solve the "Which House" puzzle in Python. You've not only learned how to unravel this intriguing puzzle but also gained valuable problem-solving skills that can be applied to a wide range of logical challenges. By sharing this content on your website, you can assist your audience in unraveling similar enigmas, fostering their coding skills and analytical thinking. Happy coding, and may you continue to explore the exciting world of programming and puzzles!

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