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<section id="new-starter-python">
<span id="newstarterpython"></span><h1>New Starter Python<a class="headerlink" href="#new-starter-python" title="Link to this heading">#</a></h1>
<nav class="contents local" id="contents">
<ul class="simple">
<li><p><a class="reference internal" href="#prerequisites" id="id3">Prerequisites</a></p></li>
<li><p><a class="reference internal" href="#version-control" id="id4">Version Control</a></p></li>
<li><p><a class="reference internal" href="#python-basics" id="id5">Python Basics</a></p>
<ul>
<li><p><a class="reference internal" href="#reading" id="id6">Reading</a></p></li>
<li><p><a class="reference internal" href="#exercise" id="id7">Exercise</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#object-oriented-python-basics" id="id8">Object Oriented Python Basics</a></p>
<ul>
<li><p><a class="reference internal" href="#id1" id="id9">Reading</a></p></li>
<li><p><a class="reference internal" href="#id2" id="id10">Exercise</a></p></li>
</ul>
</li>
<li><p><a class="reference internal" href="#further-reading" id="id11">Further reading</a></p></li>
</ul>
</nav>
<section id="prerequisites">
<h2><a class="toc-backref" href="#id3" role="doc-backlink">Prerequisites</a><a class="headerlink" href="#prerequisites" title="Link to this heading">#</a></h2>
<ul class="simple">
<li><p>Access to the <a class="reference external" href="https://docs.python.org/3/">Python documentation</a></p></li>
<li><p>You will also need a computer with a Python development environment.</p></li>
<li><p>Git: <em>Windows/Mac</em> - Download the latest version from <a class="reference external" href="http://git-scm.com/">http://git-scm.com/</a>; <em>Linux</em> - Install from package manager (ubuntu pkg=git-gui)</p></li>
</ul>
</section>
<section id="version-control">
<h2><a class="toc-backref" href="#id4" role="doc-backlink">Version Control</a><a class="headerlink" href="#version-control" title="Link to this heading">#</a></h2>
<p>You will be using the <a class="reference external" href="http://git-scm.com/documentation">git</a> version control system with Mantid. Here we aim to get you started using git while working through the new exercises. Our code is stored on <a class="reference external" href="https://www.github.com/">github</a> so to get started you will need an account.</p>
<ol class="arabic simple">
<li><p>Navigate to <a class="reference external" href="https://github.com/">github</a>, fill in the details: username (e.g. firstnamelastname), email & password and click sign up.</p></li>
<li><p>Go to <a class="reference external" href="https://help.github.com/articles/set-up-git">https://help.github.com/articles/set-up-git</a> and follow the instructions to set up git for your environment (for windows do NOT use the native app)</p></li>
</ol>
<p>Before you start the exercises below it is a good idea to read <a class="reference external" href="http://git-scm.com/book/en/Git-Basics-Recording-Changes-to-the-Repository">this</a> page that discusses the basic operations of working with git.</p>
<p>The idea of version control is that snapshots of the development history can be recorded and these states returned to if necessary. As you go through the exercises and get to a point where something is working it is a good idea to <em>commit</em> the changes to your new repository. On Mantid we use what are known as branches within the repository to keep track of a single piece of work. The idea is that each feature/bugfix is developed independently on a separate branch within the repository. When the work is complete, it is tested by another developer and merged within a special branch, called <strong>main</strong>. This branch is reserved code that will form part of that distributed to users. More details on Mantid’s workflow with git can be found <a class="reference external" href="https://developer.mantidproject.org/GitWorkflow.html">here</a>.</p>
<p>While developing the code for your exercises you will work in a separate repository <a class="reference external" href="https://github.com/mantidproject/newstarter">here</a> but the intention is that you will follow the workflow described in the document above and in particular using the commands described in <a class="reference external" href="https://developer.mantidproject.org/GitWorkflow.html#Workflow_Git_Commands">this</a> section. Do not use the macros yet, the aim is to understand the process by using the real commands.</p>
<p>Before starting the exercises, there are some setup steps:</p>
<ul class="simple">
<li><p>Clone this repository: <a class="github reference external" href="https://github.com/mantidproject/newstarter">mantidproject/newstarter</a></p></li>
<li><p>Make a new branch <code class="docutils literal notranslate"><span class="pre">git</span> <span class="pre">checkout</span> <span class="pre">--no-track</span> <span class="pre">-b</span> <span class="pre">firstname_lastname_exercises</span> <span class="pre">origin/main</span></code>, where <em>firstname</em>, <em>lastname</em> should be replaced as appropriate.</p></li>
<li><p>Make a copy of the <em>exercises-python/template</em> directory and name it <em>firstname_lastname</em>. The directory should be in the exercises directory.</p></li>
<li><p>Make a directory called <em>builds</em> in the root of the <em>newstarter</em> repository. Git is setup to ignore this directory.</p></li>
</ul>
<p>Now you are ready to code the solution to the exercise in your chosen native build environment.</p>
<ul class="simple">
<li><p>As you work use the git commands to commit to your branch and push to GitHub.</p></li>
<li><p>When you think you have completed the exercise you can use the continuous integration build servers to check your work. To do this you first need to create a pull-request. See <a class="reference external" href="https://help.github.com/articles/creating-a-pull-request/">create a pull request</a> for your branch so that it can be reviewed by a senior developer.</p></li>
<li><p>The pull request will kick-off builds on Red Hat and Windows platforms and GitHub will mark up the results of these builds on the pull requests. Try and get each build to a green status before saying it is ready for review. As you push further commits to your branch the PR will update and new builds will kick off to check your work. Continue in this pattern until the builds pass. If you’re not sure how to resolve some errors check with another member of the team.</p></li>
</ul>
</section>
<section id="python-basics">
<h2><a class="toc-backref" href="#id5" role="doc-backlink">Python Basics</a><a class="headerlink" href="#python-basics" title="Link to this heading">#</a></h2>
<p>Feel free to skim read sections that you understand, just pay attention to anything that is new to you.</p>
<p>Mantid uses Python 3.</p>
<section id="reading">
<h3><a class="toc-backref" href="#id6" role="doc-backlink">Reading</a><a class="headerlink" href="#reading" title="Link to this heading">#</a></h3>
<ul class="simple">
<li><p>Python library: <a class="reference external" href="https://docs.python.org/3/library/stdtypes.html#text-sequence-type-str">Strings</a></p></li>
<li><p>Python tutorial: <a class="reference external" href="https://docs.python.org/3/tutorial/controlflow.html#defining-functions">Defining Functions</a></p></li>
<li><p>Python tutorial: <a class="reference external" href="https://docs.python.org/3/tutorial/datastructures.html#dictionaries">Dictionaries</a></p></li>
<li><p>Python tutorial: <a class="reference external" href="https://docs.python.org/3/tutorial/stdlib.html#command-line-arguments">Command Line Arguments</a></p></li>
</ul>
</section>
<section id="exercise">
<h3><a class="toc-backref" href="#id7" role="doc-backlink">Exercise</a><a class="headerlink" href="#exercise" title="Link to this heading">#</a></h3>
<p>The code should be placed in <em>exercises-python/firstname_lastname/ex01_basics/”</em></p>
<p>Write a command line program that will:</p>
<ol class="arabic simple">
<li><p>Take a filename of an ascii file as an argument (you can use the example file <a class="reference external" href="https://github.com/martyngigg/cpp-examples/raw/master/Holmes.txt">here</a>)</p></li>
<li><p>Load that ascii file.</p></li>
<li><p>Count the number of occurrences of unique words (longer than 4 characters and split hyphenated words, treating each part as different words). It should be case and punctuation insensitive. You only need to consider the following punctuation characters <code class="docutils literal notranslate"><span class="pre">.,?'"!():</span></code> (hint: you will need a backslash escape character for the double-quote)</p></li>
<li><p>Consider handling of common error cases, such as the wrong file name specified. Return error and status information to the user of the command line tool.</p></li>
<li><p>Print the results to screen showing the unique words and the number of uses in descending order of usage, e.g.</p></li>
</ol>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Word</span> <span class="n">Usage</span>
<span class="n">which</span> <span class="mi">55</span>
<span class="n">holmes</span> <span class="mi">49</span>
<span class="n">there</span> <span class="mi">32</span>
<span class="n">could</span> <span class="mi">25</span>
<span class="n">photograph</span> <span class="mi">21</span>
<span class="o">...</span>
</pre></div>
</div>
</section>
</section>
<section id="object-oriented-python-basics">
<h2><a class="toc-backref" href="#id8" role="doc-backlink">Object Oriented Python Basics</a><a class="headerlink" href="#object-oriented-python-basics" title="Link to this heading">#</a></h2>
<section id="id1">
<h3><a class="toc-backref" href="#id9" role="doc-backlink">Reading</a><a class="headerlink" href="#id1" title="Link to this heading">#</a></h3>
<ul class="simple">
<li><p>Python tutorial: <a class="reference external" href="https://docs.python.org/3/tutorial/classes.html">Classes</a></p></li>
<li><p>Python HowTo: <a class="reference external" href="https://docs.python.org/3/howto/sorting.html">Sorting</a></p></li>
</ul>
</section>
<section id="id2">
<h3><a class="toc-backref" href="#id10" role="doc-backlink">Exercise</a><a class="headerlink" href="#id2" title="Link to this heading">#</a></h3>
<p>The code should be placed in <em>exercises-python/firstname_lastname/ex02_oo_basics”</em></p>
<p>Write a command line program that:</p>
<ol class="arabic simple">
<li><p>Has classes to allow number of shapes to be defined: square (side1), rectangle(side1, side2), circle(radius), triangle(height, base).</p>
<ol class="arabic simple">
<li><p>Each shape class should know it’s type (“Square”), how many sides it has.</p></li>
<li><p>Each shape needs to be able to calculate it’s perimeter and area. For the triangle you can assume it is isoceles and the perimeter can be computed using <span class="math notranslate nohighlight">\(p = b + 2\sqrt{h^2+(b^2/4)}\)</span>, where <span class="math notranslate nohighlight">\(b\)</span> is the base and <span class="math notranslate nohighlight">\(h\)</span> is the height.</p></li>
</ol>
</li>
<li><p>Within the Main method create a variety of the shapes and put them in a list</p></li>
<li><p>Create a class ShapeSorter which should contain four methods</p>
<ol class="arabic simple">
<li><p>Print out the Shapes that match a chosen type</p></li>
<li><p>Print out the Shapes that match a chosen number of sides</p></li>
<li><p>Print out the Shapes in order of area descending</p></li>
<li><p>Print out the Shapes in order of perimeter descending</p></li>
</ol>
</li>
</ol>
</section>
</section>
<section id="further-reading">
<h2><a class="toc-backref" href="#id11" role="doc-backlink">Further reading</a><a class="headerlink" href="#further-reading" title="Link to this heading">#</a></h2>
<p>Further Python:</p>
<ul class="simple">
<li><p><a class="reference external" href="https://greenteapress.com/wp/think-python-2e/">Think Python</a></p></li>
<li><p>Python style guide <a class="reference external" href="https://www.python.org/dev/peps/pep-0008/">PEP8</a></p></li>
</ul>
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