Ontology Reasoning

Good day, I have developed a python program to check similarity between two files. file 1 is a dataset, file two is content of ontology i created and exported it as a csv file.
But i want to modify the program so that i do not need to export file 2 as a csv. That means i have to use an ontology reasoner as a parser between the dataset in file 1 and the ontology.
FYI: The project is very small and it just a minor modification.

Please check the below url to understand the ontology reasoner.
https://owlready2.readthedocs.io/en/latest/reasoning.html

Note: I will share the code of the program.