Average Mask
============

Implement the following Python function in the module :mod:`mask_avg` (file :file:`mask_avg.py`):

    ``mask_avg(L, Lmask)``
    
such that

    **given** ``L``, ``Lmask`` lists of :class:`float` with same length.
    
    **modifies** ``L`` by replacing every value by the average of this value and the value placed in the same position in ``Lmask``. The new value must be rounded to 1 decimal.

For example:

.. literalinclude:: mask_avg-test.txt
    :language: python3
    :start-after: ---- ini
    :end-before: ---- fi
   
Doctests are available at the :download:`mask_avg-test.txt` file.