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<head>
<title>Python Key Skills - 2</title>
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<body>
<div id="content">
<h1 class="title">Python Key Skills - 2</h1>
<div id="table-of-contents">
<h2>Table of Contents</h2>
<div id="text-table-of-contents">
<ul>
<li><a href="#sec-1">1. Python Key Skills 2</a>
<ul>
<li><a href="#sec-1-1">Learn It - for loops and while loops</a>
<ul>
<li><a href="#sec-1-1-1">for loops</a></li>
<li><a href="#sec-1-1-2">while loops</a></li>
</ul>
</li>
<li><a href="#sec-1-2">Learn It - check if a whole number is even or odd</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-1" class="outline-2 activity">
<h2 id="sec-1"><span class="section-number-2">1</span> Python Key Skills 2</h2>
<div class="outline-text-2" id="text-1">
</div>
<div id="outline-container-sec-1-1" class="outline-3 learn">
<h3 id="sec-1-1">Learn It - for loops and while loops</h3>
<div class="outline-text-3" id="text-1-1">
<ul class="org-ul">
<li>The purpose of loops is to repeat a set of commands or a block of code
</li>
</ul>
</div>
<div id="outline-container-sec-1-1-1" class="outline-4">
<h4 id="sec-1-1-1">for loops</h4>
<div class="outline-text-4" id="text-1-1-1">
<ul class="org-ul">
<li>for loops are normally used to repeat a set of commands for a specific known number of times.
</li>
</ul>
<div class="org-src-container">
<pre class="src src-Python">for i in range(5):
print("Hello world!")
</pre>
</div>
<ul class="org-ul">
<li>the above code will print out "Hello world!" 5 times with i starting from 0, increasing each loop by 1, up to 4.
</li>
<li>the range is a Python built-in function that produce a series of numbers.
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-1-1-2" class="outline-4">
<h4 id="sec-1-1-2">while loops</h4>
<div class="outline-text-4" id="text-1-1-2">
<ul class="org-ul">
<li>while loops are normally used to repeat a set of commands until certain condition(s) are no longer true.
</li>
<li>Example while loop 1:
</li>
</ul>
<div class="org-src-container">
<pre class="src src-Python">i=0
while i < 5:
print("Hello world!")
i = i + 1
</pre>
</div>
<ul class="org-ul">
<li>Example while loop 2:
</li>
</ul>
<div class="org-src-container">
<pre class="src src-Python">hungry = True
while hungry:
print("I need eat more.")
answer = input("Are you still hungry?(Y/N)")
if answer == "N":
hungry = False
</pre>
</div>
<ul class="org-ul">
<li>The above loop will end if the user input "N", which changes the hungry variable to "False". This means, the condition is not true anymore.
</li>
</ul>
</div>
</div>
</div>
<div id="outline-container-sec-1-2" class="outline-3 learn">
<h3 id="sec-1-2">Learn It - check if a whole number is even or odd</h3>
<div class="outline-text-3" id="text-1-2">
<ul class="org-ul">
<li>We know from maths that all even numbers can be divisible by 2. In other words, any even number, when divided by 2, the reminder should be 0 - no reminder.
</li>
<li>In Python, we have learned that the reminder operator is <b>%</b>. For example: 24%2 = 0; 25%2=1; 1%2=1 etc
</li>
<li>So if the reminder is 0 when divided by 2, then the number is even.
</li>
</ul>
<pre class="example">
myNum = int(input("Please give me a whole number: "))
if myNum % 2 == 0:
print("The number you game to me is an even number")
else:
print("The number you game to me is an odd number")
</pre>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="validation"></p>
</div>
</body>
</html>