Hi guys,
I recently wrote an article titled How to detect plagiarism in text using python whereby I show how you can easily detect plagiarism between documents as the title says manually using cosine similarity.

I republished that article on multiple platforms including here on dev.to and Hackernoon, and it's one of my most viewed articles plus the most starred GitHub repository among articles repositories.

Which gave me a second thought to refactor the code/article to make it more easily and friendly to get started with even for absolute beginners leading me to build a python library pysimilar which I can say simplify it to the maximum;

Getting started with Pysimilar

To get started with pysimilar for comparing text documents, you just need to install first of which you can either install directly from GitHub or using pip.

Here how to install pysimilar using pip

$ pip install pysimilar

Here how to install directly from github

$ git clone https://github.com/Kalebu/pysimilar
$ cd pysimilar
$ pysimilar -> python setup.py install

With Pysimilar you can either compare text documents as strings or specify the path to the file containing the textual documents.

Comparing strings directly

You can easily compare strings using pysimilar using compare() method just as illustrated below;

>>> from pysimilar import compare
>>> compare('very light indeed', 'how fast is light')
0.17077611319011649

Comparing strings contained files

To compare strings contained in the files, you just need to explicitly specify the isfile parameter to True just as illustrated below;

>>> compare('README.md', 'LICENSE', isfile=True)
0.25545580376557886

You can also compare documents with particular extension in a given directory, for instance, let's say I want to compare all the documents with .txt in documents directory here is what I will do;

The directory for documents used by the example below looks like this

documents/
├── anomalie.zeta
├── hello.txt
├── hi.txt
└── welcome.txt

Here how to compare files of a particular extension

>>> import pysimilar
>>> from pprint import pprint
>>> pysimilar.extensions = '.txt'
>>> comparison_result = pysimilar.compare_documents('documents')
>>> [['welcome.txt vs hi.txt', 0.6053485081062917],
    ['welcome.txt vs hello.txt', 0.0],
    ['hi.txt vs hello.txt', 0.0]]

You can also sort the comparison score based on their score by changing the ascending parameter, just as shown below;

>>> comparison_result = pysimilar.compare_documents('documents', ascending=True)
>>> pprint(comparison_result)
[['welcome.txt vs hello.txt', 0.0],
 ['hi.txt vs hello.txt', 0.0],
 ['welcome.txt vs hi.txt', 0.6053485081062917]]

You can also set pysimilar to include files with multiple extensions

>>> import pysimilar
>>> from pprint import pprint
>>> pysimilar.extensions = ['.txt', '.zeta']
>>> comparison_result = pysimilar.compare_documents('documents', ascending=True)
>>> pprint(comparison_result)
[['welcome.txt vs hello.txt', 0.0],
 ['hi.txt vs hello.txt', 0.0],
 ['anomalie.zeta vs hi.txt', 0.4968161174826459],
 ['welcome.txt vs hi.txt', 0.6292275146695526],
 ['welcome.txt vs anomalie.zeta', 0.7895651507603823]]

Well that's all for this article, Excited to see what you will build with it

$  git clone https://github.com/Kalebu/pysimilar
$  cd pysimilar
$ pysimilar -> python setup.py install

$ pip install pysimilar

>>> from pysimilar import compare
>>> compare