The article discusses the features of teaching programming in Python of high school students, taking into account the experience of programming in the Pascal language obtained by students in the main school. Based on the analysis of the content of textbooks for in-depth study of informatics and their own experience of teaching informatics, the authors show the advantages of the Python language for motivating students to study it and use specific examples to reveal certain methodological aspects of teaching programming in the Python language. In particular, using a comparative analysis of program codes for implementing data input and output procedures, conditional algorithmic construction, as well as for describing data types in two programming languages, the authors clearly show the advantages of developing programs in Python. More specific details of programming are considered on the example of the theme "Arrays".