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    <title>Week 7 - Functions</title>

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        <section>
          <br>
          <h2>Python 101</h2>
          <h3>Week 7:<br>Functions</h3>
          <p>
            <small>Expedia Code Academy</small>
            <br>
            <img src="static/img/code_academy_logo.png" border="0px">
          </p>
        </section>

        <section>
          <h3>Functions</h3>
          <p>
            Functions are bits of code that are <i>reusable</i>. This is handy because:<br>
            <ul>
              <li class="fragment">You don't have to type as much</li>
              <li class="fragment">It's easier to read</li>
              <li class="fragment">If there's a mistake you only need to fix it once!</li>
            </ul>
          </p>
          <div class="fragment">
            Examples:
            <pre><code class="python" data-trim>
              # The print function with 1 argument: a string
              print("hello")

              # The len function with 1 argument: a list
              len([0, 1, 2, 3])
            </code></pre>
          </div>
        </section>

        <section>
          <h3>Creating your own functions</h3>
          <p>
            <br>The syntax involves these key words: <span id="code">def</span> and <span id="code">return</span><br><br>
            Here's a function that adds 2 number <i>arguments</i> together:

            <pre><code class="python" data-trim>
              def add_two_numbers(num1, num2):
                  result = num1 + num2
                  return result

              # Let's call our function!
              sum = add_two_numbers(612, 847)
            </code></pre>
          </p>
        </section>

        <section>
          <h3>Things to remember</h3>
          <p>
            <br>Always write your function before you call it!<br>
            The below won't work - what error do you get?

            <pre><code class="python" data-trim>
              # Let's call our function!
              sum = add_two_numbers(612, 847)

              def add_two_numbers(num1, num2):
                  result = num1 + num2
                  return result
            </code></pre>

            <br>How about this?
            <div id="fragment">
              <pre><code class="python" data-trim>
                sum = add_two_numbers(612, 847, 555)
              </code></pre>
            </div>
          </p>
        </section>

        <section>
          <h3>Different arguments</h3>
          <p>
            <br>What will <span id="code">sum</span> be in this example?<br><br>

            <pre><code class="python" data-trim>
              def add_two_numbers(num1, num2):
                  result = num1 + num2
                  return result

              sum = add_two_numbers('my hovercraft is ', 'full of eels')
            </code></pre>
          </p>
        </section>

        <section>
          <h3>Exercises</h3>
          <ul>
            <li>(⭐️) 7a. Write a function that multiplies 2 numbers and returns the result</li>
            <li>(⭐️⭐️) 7b. Write a function that multiplies all the numbers in a list together</li>
            <br>
            <li>See <a href="https://github.com/python101ldn/exercises/blob/master/Session_7/supermarket.py">here</a> for the next exercises!</li>
          </ul>
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