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This module provides a newnext() function in Python 2 that mimics the
behaviour of ``next()`` in Python 3, falling back to Python 2's
behaviour for
compatibility if this fails.

``newnext(iterator)`` calls the iterator's ``__next__()`` method if it
exists. If this
doesn't exist, it falls back to calling a ``next()`` method.

For example:

    >>> class Odds(object):
    ...     def __init__(self, start=1):
    ...         self.value = start - 2
    ...     def __next__(self):                 # note the Py3 interface
    ...         self.value += 2
    ...         return self.value
    ...     def __iter__(self):
    ...         return self
    ...
    >>> iterator = Odds()
    >>> next(iterator)
    1
    >>> next(iterator)
    3

If you are defining your own custom iterator class as above, it is
preferable
to explicitly decorate the class with the @implements_iterator decorator
from
``future.utils`` as follows:

    >>> @implements_iterator
    ... class Odds(object):
    ...     # etc
    ...     pass

This next() function is primarily for consuming iterators defined in Python
3
code elsewhere that we would like to run on Python 2 or 3.
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    next(iterator[, default])

    Return the next item from the iterator. If default is given and the
iterator
    is exhausted, it is returned instead of raising StopIteration.
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