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POLPTHW Excercise 48 Help - Working with Tuples in Lists
 

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  1. POLPTHW Excercise 48 Help - Working with Tuples in Lists
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    <p>I'm currently going through LPTHW and I'm up to <a href="http://learnpythonthehardway.org/book/ex48.html" rel="nofollow noreferrer">excercise 48</a> and it's the first time I've hit a brick wall. </p> <p>Here's the first part of the test case I've been given</p> <pre><code>from nose.tools import * from ex48 import lexicon def test_direction(): assert_equal(lexicon.scan("north"), [('direction', 'north')]) result = lexicon.scan("north south east") assert_equal(result, [('direction', 'north'), ('direction', 'south'), ('direction', 'east')]) </code></pre> <p><a href="https://stackoverflow.com/questions/6881193/learn-python-the-hard-way-exercise-48-help">This question has been asked here before</a>, and I noticed my current solution so far is pretty identical to the <a href="https://stackoverflow.com/questions/6881193/learn-python-the-hard-way-exercise-48-help/7241227#7241227">answer provided by robbyt</a>. Yet it still doesn't work.</p> <pre><code>def scan(thewords): directions = [('direction', 'north'), ('direction', 'south'), ('direction', 'east')] thewords = thewords.split() sentence = [] for i in thewords: if i in directions: sentence.append(('direction', i)) else: sentence.append(('error', i)) return sentence </code></pre> <p><strong>So the question is: After taking the input (thewords), how do I search through the list of tuples correctly and then return the specific tuple it's a part of?</strong></p> <p>Thanks in advance for any sort answers and advice, really stuck with this one.</p>
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    1. COThink about what you need `directions` to hold in your function. Does it need to hold the text `'direction'` three times?
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    2. COThanks, it looks as though I was simply over complicating things for myself. I simply changed it to a list containing only the second elements and got it working.
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