Temperature analysis (3 points)
===============================

Now, to analyze the temperature at different points in the production
center, the same company has obtained a nested list in which each
sublist has three items: point code (:py:class:`str`), temperature
(:py:class:`int`) and humidity (:py:class:`int`). The
temperature and humidity are always positive integers.

Write function :py:func:`temperature` that takes a nested list as
described, and returns a tuple with two elements:

    - the average (:py:class:`float`) of the temperatures of all points in the given list, and

    - the point code (:py:class:`str`) in which the temperature is the greatest one in the given list

It may be assumed that the given list is not empty.

Save this function to file ``p2.py``.

Examples:

.. literalinclude:: test-temperature.txt
      :language: python
      :lines: 3-11

.. note::

   More tests are provided in file :download:`test-temperature.txt`.