Lecture
-------

.. admonition:: Lesson 4.1 - Introduction to Functions

    .. raw:: html

        <iframe width="560" height="315" src="https://www.youtube.com/embed/cD3MO012qqw" frameborder="0" allowfullscreen></iframe>
        <p>Dave Whipp & Henrikki Tenkanen, University of Helsinki <a href="https://www.youtube.com/channel/UCQ1_1hZ0A1Vic2zmWE56s2A">@ Geo-Python channel on Youtube</a>.</p>

.. admonition:: Lesson 4.2 - Functions and modules

    .. raw:: html

        <iframe width="560" height="315" src="https://www.youtube.com/embed/8igTLdCmbf4" frameborder="0" allowfullscreen></iframe>
        <p>Dave Whipp & Henrikki Tenkanen, University of Helsinki <a href="https://www.youtube.com/channel/UCQ1_1hZ0A1Vic2zmWE56s2A">@ Geo-Python channel on Youtube</a>.</p>

.. admonition:: Lesson 4.b1 - Exercise 3 review

    .. raw:: html

        <iframe width="560" height="315" src="https://www.youtube.com/embed/pYZhCC2NG2E" frameborder="0" allowfullscreen></iframe>
        <p>Dave Whipp & Henrikki Tenkanen, University of Helsinki <a href="https://www.youtube.com/channel/UCQ1_1hZ0A1Vic2zmWE56s2A">@ Geo-Python channel on Youtube</a>.</p>

.. admonition:: Lesson 4.b2 - Exercise 3, Problem 3 alternative approach

    .. raw:: html

        <iframe width="560" height="315" src="https://www.youtube.com/embed/a3afdnpDI80" frameborder="0" allowfullscreen></iframe>
        <p>Dave Whipp & Henrikki Tenkanen, University of Helsinki <a href="https://www.youtube.com/channel/UCQ1_1hZ0A1Vic2zmWE56s2A">@ Geo-Python channel on Youtube</a>.</p>

.. admonition:: Lesson 4.b3 - Exercise 3, Solution for extra problem

    .. raw:: html

        <iframe width="560" height="315" src="https://www.youtube.com/embed/3240i0F3MjY" frameborder="0" allowfullscreen></iframe>
        <p>Dave Whipp & Henrikki Tenkanen, University of Helsinki <a href="https://www.youtube.com/channel/UCQ1_1hZ0A1Vic2zmWE56s2A">@ Geo-Python channel on Youtube</a>.</p>