Pairs interchange
=================

Write the function :py:func:`interchange` that takes a string, and
returns another string obtained by interchanging the positions of each
non-overlapping consecutive pair of characters. Save this function into
the file ``interchange.py``. Examples:

      .. literalinclude:: interchange.txt
         :language: python3
         :lines: 2-

.. note::

   More tests are provided in file :download:`interchange.txt <interchange.txt>`

.. rubric:: Solution

A solution is provided in file :download:`interchange.py
<solutions/interchange.py>`