bool() is not a function named after a fundamental type. bool is a type. As with any type, you can call bool(...) to construct a new object of that type. https

bool() is not a function named after a fundamental type. bool is a type. As with any type, you can call bool(...) to construct a new object of that type. https://docs.python.org/3/library/functions.html#bool https://docs.python.org/3/library/functions.html#bool A good tutorial will reflect this fact and use appropriate language. Both the idea that you can "cast", and the idea that bool is a function, are misunderstandings rooted in the idea that Python should be like C in all ways.