difference between next() and .__next__

[buran]

__next__ is a special method.
https://docs.python.org/3/library/stdtyp...r.__next__
https://docs.python.org/3/reference/expr...r.__next__

next() is a built-in function, that calls __next__() method of the first argument you supply. The docs:

next(iterator)
next(iterator, default)
Retrieve the next item from the iterator by calling its __next__() method. If default is given, it is returned if the iterator is exhausted, otherwise StopIteration is raised.