use \Tsugi\Core\LTIX;

use \Tsugi\Util\LTI;

use \Tsugi\Util\Net;

$sanity = array(

're.findall' => 'You should use re.findall() to extract the numbers'

);

$code = $USER->id+$LINK->id+$CONTEXT->id;

$sample_url = dataUrl('regex_sum_42.txt');

$actual_url = dataUrl('regex_sum_'.$code.'.txt');

$sample_data = Net::doGet($sample_url);

$sample_count = strlen($sample_data);

$response = Net::getLastHttpResponse();

if ( $response != 200 ) {

die("Response=$response url=$sample_url");

}

$actual_data = Net::doGet($actual_url);

$actual_count = strlen($actual_data);

$response = Net::getLastHttpResponse();

if ( $response != 200 ) {

die("Response=$response url=$actual_url");

}

$actual_matches = array();

preg_match_all('/[0-9]+/',$actual_data,$actual_matches);

$actual_count = count($actual_matches[0]);

$actual_sum = 0;

foreach($actual_matches[0] as $match ) {

$actual_sum = $actual_sum + $match;

}

$sample_matches = array();

preg_match_all('/[0-9]+/',$sample_data,$sample_matches);

$sample_count = count($sample_matches[0]);

$sample_sum = 0;

foreach($sample_matches[0] as $match ) {

$sample_sum = $sample_sum + $match;

}

$oldgrade = $RESULT->grade;

if ( isset($_POST['sum']) && isset($_POST['code']) ) {

$RESULT->setJsonKey('code', $_POST['code']);

if ( $_POST['sum'] != $actual_sum ) {

$_SESSION['error'] = "Your sum did not match";

header('Location: '.addSession('index.php'));

return;

}

$val = validate($sanity, $_POST['code']);

if ( is_string($val) ) {

$_SESSION['error'] = $val;

header('Location: '.addSession('index.php'));

return;

}

LTIX::gradeSendDueDate(1.0, $oldgrade, $dueDate);

// Redirect to ourself

header('Location: '.addSession('index.php'));

return;

}

if ( $RESULT->grade > 0 ) {

echo('<p class="alert alert-info">Your current grade on this assignment is: '.($RESULT->grade*100.0).'%</p>'."\n");

}

if ( $dueDate->message ) {

echo('<p style="color:red;">'.$dueDate->message.'</p>'."\n");

}

<p>

<b>Finding Numbers in a Haystack</b>

<p>

In this assignment you will read through and parse a file with text and numbers. You will extract all the numbers

in the file and compute the sum of the numbers.

</p>

<b>Data Files</b>

<p>

We provide two files for this assignment. One is a sample file where we give you the sum for your

testing and the other is the actual data you need to process for the assignment.

<ul>

<li> Sample data: <a href="<?= deHttps($sample_url) ?>" target="_blank"><?= deHttps($sample_url) ?></a>

(There are <?= $sample_count ?> values with a sum=<?= $sample_sum ?>) </li>

<li> Actual data: <a href="<?= deHttps($actual_url) ?>" target="_blank"><?= deHttps($actual_url) ?></a>

(There are <?= $actual_count ?> values and the sum ends with <?= $actual_sum%1000 ?>)<br/> </li>

</ul>

These links open in a new window.

Make sure to save the file into the same folder as you will be writing your Python program.

<b>Note:</b> Each student will have a distinct data file for the assignment - so only use your

own data file for analysis.

</p>

<b>Data Format</b>

<p>

The file contains much of the text from the introduction of the textbook

except that random numbers are inserted throughout the text. Here is a sample of the output you might see:

<pre>

Why should you learn to write programs? 7746

12 1929 8827

Writing programs (or programming) is a very creative

7 and rewarding activity. You can write programs for

many reasons, ranging from making your living to solving

8837 a difficult data analysis problem to having fun to helping 128

someone else solve a problem. This book assumes that

everyone needs to know how to program ...

</pre>

The sum for the sample text above is <b>27486</b>.

The numbers can appear anywhere in the line. There can be any number of

numbers in each line (including none).

</p>

<b>Handling The Data</b>

<p>

The basic outline of this problem is to read the file, look for integers using the

<b>re.findall()</b>, looking for a regular expression of <b>'[0-9]+'</b> and then

converting the extracted strings to integers and summing up the integers.

</p>

<p>

<?php httpsWarning($sample_url); ?>

<b>Turn in Assignent</b>

<form method="post">

Enter the sum from the actual data and your Python code below:<br/>

Sum: <input type="text" size="20" name="sum"> (ends with <?= $actual_sum%1000 ?>)

<input type="submit" value="Submit Assignment"><br/>

Python code:<br/>

<textarea rows="20" style="width: 90%" name="code"></textarea><br/>

</form>

</p>

<b>Optional: Just for Fun</b>

<p>

There are a number of different ways to approach this problem. While we don't recommend trying

to write the most compact code possible, it can sometimes be a fun exercise. Here is a

a redacted version of two-line version of this program using list comprehension:

<pre>

import re

print sum( [ ****** *** * in **********('[0-9]+',**************************.read()) ] )

</pre>

Please don't waste a lot of time trying to figure out the shortest solution until you

have completed the homework. List comprehension is mentioned in Chapter 10 and the

<b>read()</b> method is covered in Chapter 7.

</p>