Another way to see the difference between a sequence and an iterable is that a sequence has to have a __getitem__ method. As explained in Chapter 15, __getitem__ is called when indexing is used so ...

A clear, visual introduction to loops in Python. This free poster focuses on for loops, helping students understand how code repeats and how loops are used in programs. Designed for classroom display, ...

If you need to get an iterator from an iterable then it is better to use the built-in function iter() rather than the __iter__ method which is intended to be internal. One advantage is that if the ...