In this paper analysis methods for examining the similarity of legal texts and using them to semantic processing tools in the Python language will be presented. It would give the possibility of acquiring semantic relations from legal text. Developed this year, version 3.0 of the “Słowosieć”, which is currently evolving dynamically, gives the possibility to use its results (the largest Polish language thesaurus) for the undertaken research in this topic. The research in this area is also a result of the research carried out in the domain of analysis of the similarity of texts of the Polish law and the fact of cooperation between the author and scientists from the Jagiellonian University (the Faculty of Law and Administration of the Jagiellonian University) on the issues of electronic processing of legal information.