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# Compression Algorithm w/Python

## Goal

4Geeks Coding Projects tutorials and exercises for people learning to code or improving their coding skills

Difficulty

beginner

Repository

Click to open

Video

Not available

Live demo

Not available

Average duration

4 hrs

Technologies

Lets create a compression algorithm π€― It sounds hard but it's something achievable for almost anyone.

## π Instructions

Create an algorithm that given a string, replaces its words matching the `symbols` dictionary keys and replaces them with their respective values on the same dictionary.

``````1symbols = {
2    "implementation": "π€―",
4    "better": 'π',
5    "Although": "π₯Ί"
6}``````

For example:

`Although, this is a great implementation of time`β should become β`π₯Ί, this is a great π€― of time`

The current project has 3 main files:

NameDescription
compress.pyContains the algorithm to compress the content, it has a function "compress" that receives the raw text and returns the compressed version of it
decompress.pyIt's very similar to `compress.py` but it contains the algorithm to convert back the content from its compressed version to the original content
app.pyThis is entry file, and there is no need to update it, it imports and uses the other two files

## π’ Steps

1. Take time to understand the code, start by opening and reading the `app.py` and follow the algorithm with your brain, review the compress.py and decompress.py files to understand where your solution must be implemented.
2. Run the app.py by typing `python3 app.py` and undestand what is the output and why.
3. Edit the compress.py to create the compression algorithm.
4. Test your compression algorithm by running the app.py again.
5. Edit the decompress.py to create the decompression algorithm.
6. Test your decompression algorithm by running the app.py again.

## π± How to start this project

This project comes with the necessary files to start working, but you have two options to start:

b) You can clone this repository on your local computer:

``1\$ git clone https://github.com/breatheco-de/exercise-compression-algorithm-python.git``

Type the following in the command line:

``1python3 app.py``

You should get a response similar to this:

``````1βNo data lost.
2document.txt has 824 size, compressed.txt has 768 size, compression of 7% in 0.0003972053527832031 seconds ``````

π‘ Important: Remember to create a new repository, update the remote (`git remote set-url origin <your new url>`), and upload the code to your new repository using `add`, `commit` and `push`.

## π― Metrics

1. Compression power: Ratio is defined as the ratio between the uncompressed size and compressed size.
2. No Data lost: If we compress and decompress document.txt the result should be the original string of content.

By adding more words to the `symbols` dict you can achieve more compression power.

Try to re-do the algorithm to achieve a compression power above 15% with no data lost without just adding more words.

## Goal

4Geeks Coding Projects tutorials and exercises for people learning to code or improving their coding skills

Difficulty

beginner

Repository

Click to open

Video

Not available

Live demo

Not available

Average duration

4 hrs

Technologies