Please note this is my first issue.

The documentation at https://docs.python.org/3/tutorial/classes.html#iterators on the second code block gives the example of iterating a string by creating an iterator out of it. However I tried it with python 3.5 and 3.6 and both give me a "str_iterator" which has no "next()" method. When I tried the code with python 2.7, it works.