This book for beginning programmers wishing to begin to program in language of Python 3. A book will be useful to the students of mechanics and for workshop designers-mechanics, and also for разметчиков. The calculations offered in a book save business hours and diminish the amount of errors in calculations. A programming of Python language well befits for the rapid decision of tasks on determination of optimal sizes and parameters. Programming on Python requires less time, than on other languages. To the designers in a workshop often has quickly to execute various calculations - the library of the small programs allows considerably to save time and decrease probability of errors. This book is collection of listing of executable codes. All programs, at different times, are worked out by an author in case of occurring of necessity of these calculations. All programs are tested constantly used in-process designer-mechanic. Listing it comfortably to use as the prepared blocks for the again developed programs.