How to Sort a Dictionary by Key Length in Python Without Using Built-in Functions

Описание: Discover how to sort a dictionary by the length of words without relying on built-in Python functions. This guide provides step-by-step solutions and alternatives for custom implementations.
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How to Sort a Dictionary by Key Length in Python Without Using Built-in Functions

Sorting a dictionary by the length of its keys can be a bit tricky, especially if you're trying to avoid using built-in functions. In this guide, we’ll walk through a common problem: creating a dictionary where the keys represent the lengths of words and the values contain those words. We'll then explore how to sort this dictionary based on the key lengths without using any built-in sorting functionalities.

The Problem

Imagine you have a sentence, and your goal is to extract the words while organizing them into a dictionary where the keys are their lengths. For example, given the sentence "this is a test test needs a check", you'd want to associate the length of each word with the respective words that have that length:

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However, you'd like the final output to display the keys in increasing order:

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Solution Breakdown

Let’s break down the solution step by step.

Step 1: Create a Dictionary from the Sentence

The first step is to create a dictionary that assigns each word's length to its respective words. Here's a basic version of how you'd start building this dictionary:

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Step 2: Sorting the Dictionary Keys

With Python versions 3.6 and onward, dictionaries maintain the insertion order, which helps in keeping track of how we insert our length keys. However, to sort it without built-in functions, you may implement a sorting algorithm manually. For this, we'll demonstrate a quick_sort function:

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Step 3: Putting It All Together

Next, we integrate everything into the string_leng function to return the correctly sorted dictionary:

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Complete Code Example

Here’s the complete code for clarity:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the steps outlined above, you can successfully create and sort a dictionary based on the lengths of words without using built-in functions. This exercise not only helps in understanding dictionary manipulation in Python but also enhances your grasp of custom sorting algorithms. Happy coding!