The aim of thesis is to study the behavior of customers who buy diapers (baby diapers), baby food and baby wipes by observing the supermarket promotional plan as well as the promotional plan applied to the rest of the market. The purpose is to find out how customers react to the promotional plan of the supermarket and the rest of the market. The study aims to create a model that will help to understand customer behavior up to now and in the future. Based on the above study, an analysis method will be implemented in python with a case study for the retail trade that will offer predictive analyzes of consumer behavior through data mining.