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<head>
<title>Python Key Skills - List Comprehension</title>
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<body>
<div id="content">
<h1 class="title">Python Key Skills - List Comprehension</h1>
<div id="outline-container-sec-1" class="outline-2 activity">
<h2 id="sec-1"><span class="section-number-2">1</span> List Comprehensions</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</h3>
<div class="outline-text-3" id="text-1-1">
<ul class="org-ul">
<li>There is an easier way of creating lists in Python called <code>List Comprehensions</code>.
</li>
<li>Using only one line of code you will create a list of data that meet certain criteria.
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-1-2" class="outline-3 code">
<h3 id="sec-1-2">Code It</h3>
<div class="outline-text-3" id="text-1-2">
<ul class="org-ul">
<li>The easiest way of learning about list comprehensions is to write some.
</li>
</ul>
<div class="org-src-container">
<pre class="src src-python">numbersto10 = [number for number in range(10)]
</pre>
</div>
<ul class="org-ul">
<li>We start by naming our list.
</li>
<li>In the square brackets is the list comprehension.
</li>
<li>This one says.
<ul class="org-ul">
<li>Fill the list with <code>number</code>
</li>
<li>Where <code>number</code> is each element of <code>range(10)</code>
</li>
</ul>
</li>
<li>Let's have a look at another one.
</li>
</ul>
<div class="org-src-container">
<pre class="src src-python">foo = 'Hello World!'
bar = [character for character in foo]
</pre>
</div>
<ul class="org-ul">
<li>Here we create a list containing all the characters that are in foo.
</li>
</ul>
</div>
</div>
<div id="outline-container-sec-1-3" class="outline-3 badge">
<h3 id="sec-1-3">Try It</h3>
<div class="outline-text-3" id="text-1-3">
<ul class="org-ul">
<li>Type each line of the following code into a Python intepreter.
</li>
<li>Try to understand how each list is created by examining the results
</li>
</ul>
<div class="org-src-container">
<pre class="src src-python">List1 = [i for i in range(20,10,-1)]
print(List1)
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">List2 = [j**2 for j in range(10)]
print(List2)
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">List3 = [k for k in range(100) if k % 2 == 0]
print(List3)
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">List4 = [l.lower() for l in 'ABCDEFG']
print(List4)
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">List5 = ['_' for m in 'Hello World!']
print(List5)
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">List6 = [n for n in 'The Quick Brown Fox' if n.upper() == n and n != ' ']
print(List6)
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">List7 = [word[0] for word in 'my race should continue on to the island
shore to help ease boring eye strain tonight'.split()]
print(List7)
</pre>
</div>
<div class="org-src-container">
<pre class="src src-python">List8 = [[row[i] for row in [[1,2,3],[4,5,6],[7,8,9]]]for i in range(3)]
print(List8)
</pre>
</div>
</div>
</div>
<div id="outline-container-sec-1-4" class="outline-3 code">
<h3 id="sec-1-4">Code It - your own list comprehension</h3>
<div class="outline-text-3" id="text-1-4">
<ul class="org-ul">
<li>Use list comprehensions to create the following lists.
<ol class="org-ol">
<li>[-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,0]
</li>
<li>A list of all consonants in the sentence 'The quick brown fox jumped over the lazy dog'
</li>
<li>A list of all square numbers formed by squaring the numbers from 1 to 1000.
</li>
</ol>
</li>
</ul>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="validation"></p>
</div>
</body>
</html>