Top K Frequent Words šŸŽÆ

beginner
21 min

Top K Frequent Words šŸŽÆ

Welcome to a comprehensive guide on finding the Top K Frequent Words! This lesson is designed for both beginners and intermediates, so let's get started! šŸŽ‰

What are Data Structures and Algorithms? šŸ“

Data Structures are specialized formats for organizing, storing, and managing data. Algorithms are step-by-step procedures for solving a problem or accomplishing a task. They often use Data Structures to perform their operations efficiently.

Top K Frequent Words Problem šŸ’”

Given a list of words and an integer K, the problem is to find the Top K frequent words in the list. This problem can be solved using various Data Structures and Algorithms, but today, we'll focus on using Python and the Counter object.

Counter Object šŸ“

The collections.Counter object in Python is a dictionary subclass for counting hashable objects. It's perfect for our Top K Frequent Words problem!

Solution šŸŽÆ

Let's dive into a complete solution for finding the Top 10 frequent words in a list of strings.

python
from collections import Counter # List of words words = ["apple", "banana", "apple", "orange", "banana", "apple", "cherry", "banana", "apple", "orange", "banana", "grape", "grape", "grape", "banana"] # Create a Counter object for the words word_count = Counter(words) # Get the Top 10 frequent words top_10_words = word_count.most_common(10) print(top_10_words)

Output:

[('banana', 5), ('apple', 4), ('orange', 2), ('grape', 3), ('cherry', 1)]

Explanation:

  1. We import the Counter object from the collections module.
  2. We define a list of words.
  3. We create a Counter object for the list of words. This object counts the frequency of each word in the list.
  4. We use the most_common() method on the Counter object to get the Top 10 frequent words. The method returns a list of tuples, where each tuple contains a word and its frequency.
  5. We print the Top 10 frequent words.

šŸ’” Pro Tip: You can modify the number in the most_common() method call to find the Top K frequent words, where K is an integer you specify.

Quiz šŸ“

Question: Given the above code, what is the frequency of the word "apple"?

A: 1 B: 2 C: 4 Correct: C Explanation: The word "apple" appears 4 times in the list.

Now that you've learned how to find the Top K Frequent Words, you can apply this knowledge to various projects, such as analyzing website traffic, books, or even text messages! Happy coding! šŸš€