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<title>Coding Introduction — Evennia 1.0-dev documentation</title>
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<li class="nav-item nav-item-0"><a href="../index.html">Evennia 1.0-dev</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Coding Introduction</a></li>
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<h3><a href="../index.html">Table of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Coding Introduction</a><ul>
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<li><a class="reference internal" href="#start-with-the-tutorial">Start with the tutorial</a></li>
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<li><a class="reference internal" href="#explore-evennia-interactively">Explore Evennia interactively</a><ul>
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<li><a class="reference internal" href="#jupyter-notebook-support">Jupyter Notebook Support</a></li>
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<li><a class="reference internal" href="#more-exploration">More exploration</a></li>
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</ul>
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</li>
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<li><a class="reference internal" href="#use-a-python-syntax-checker">Use a python syntax checker</a></li>
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<li><a class="reference internal" href="#plan-before-you-code">Plan before you code</a></li>
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<li><a class="reference internal" href="#code-in-your-game-folder-not-in-the-evennia-repository">Code in your game folder, not in the evennia/ repository</a></li>
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<li><a class="reference internal" href="#learn-to-read-tracebacks">Learn to read tracebacks</a></li>
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<li><a class="reference internal" href="#docs-are-here-to-help-you">Docs are here to help you</a></li>
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<li><a class="reference internal" href="#the-most-important-point">The most important point</a></li>
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</ul>
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</li>
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</ul>
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<h4>Previous topic</h4>
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<p class="topless"><a href="Updating-Your-Game.html"
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title="previous chapter">Updating Your Game</a></p>
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<h4>Next topic</h4>
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<p class="topless"><a href="Coding-FAQ.html"
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title="next chapter">Coding FAQ</a></p>
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<!--h3>This Page</h3-->
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rel="nofollow">Show Page Source</a></li>
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<li><a href="https://www.evennia.com">Home page</a> </li>
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<li><a href="https://github.com/evennia/evennia">Evennia Github</a> </li>
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<li><a href="http://games.evennia.com">Game Index</a> </li>
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<li>
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<a href="https://discord.gg/AJJpcRUhtF">Discord</a> -
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<a href="https://github.com/evennia/evennia/discussions">Discussions</a> -
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<a href="https://evennia.blogspot.com/">Blog</a>
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</li>
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</ul>
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<h3>Versions</h3>
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<ul>
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<li><a href="Coding-Introduction.html">1.0-dev (develop branch)</a></li>
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<ul>
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<li><a href="../0.9.5/index.html">0.9.5 (v0.9.5 branch)</a></li>
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<div class="body" role="main">
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<section class="tex2jax_ignore mathjax_ignore" id="coding-introduction">
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<h1>Coding Introduction<a class="headerlink" href="#coding-introduction" title="Permalink to this headline">¶</a></h1>
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<p>Evennia allows for a lot of freedom when designing your game - but to code efficiently you still
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need to adopt some best practices as well as find a good place to start to learn.</p>
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<p>Here are some pointers to get you going.</p>
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<section id="start-with-the-tutorial">
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<h2>Start with the tutorial<a class="headerlink" href="#start-with-the-tutorial" title="Permalink to this headline">¶</a></h2>
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<p>It’s highly recommended that you jump in on the <a class="reference internal" href="../Howtos/Beginner-Tutorial/Part1/Beginner-Tutorial-Part1-Intro.html"><span class="doc std std-doc">Starting Tutorial</span></a>. Even if
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you only the beginning or some part of it, it covers much of the things needed to get started, including giving you are first introduction to Python.</p>
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</section>
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<section id="explore-evennia-interactively">
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<h2>Explore Evennia interactively<a class="headerlink" href="#explore-evennia-interactively" title="Permalink to this headline">¶</a></h2>
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<p>As mentioned in the Starting tutorial, it’s a good idea to use <a class="reference external" href="https://ipython.org/">ipython</a> to explore things using a python shell:</p>
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<div class="highlight-none notranslate"><div class="highlight"><pre><span></span># [open a new console/terminal]
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cd mygame
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evennia shell
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</pre></div>
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</div>
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<p>This will open an Evennia-aware python shell (using ipython). From within this shell, try</p>
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<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>import evennia
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evennia.<TAB>
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</pre></div>
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</div>
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<section id="jupyter-notebook-support">
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<h3>Jupyter Notebook Support<a class="headerlink" href="#jupyter-notebook-support" title="Permalink to this headline">¶</a></h3>
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<p>You can also explore evennia interactively in a <a class="reference external" href="https://jupyter.readthedocs.io/en/latest/index.html">Jupyter notebook</a>. This offers
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an in-browser view of your code similar to Matlab or similar programs. There are
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a few extra steps that must be taken in order for this to work:</p>
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<div class="highlight-none notranslate"><div class="highlight"><pre><span></span># [open a new console/terminal]
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# [activate your evennia virtualenv in this console/terminal]
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cd evennia
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pip install -r requirements_extra.txt # if not done already above
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</pre></div>
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</div>
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<p>Next, <code class="docutils literal notranslate"><span class="pre">cd</span></code> to your game folder. <em>It’s important that you are in the <em>root</em> of this folder for the next command</em>:</p>
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<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>evennia shell_plus --notebook &
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</pre></div>
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</div>
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<p>The <code class="docutils literal notranslate"><span class="pre">&</span></code> at the end starts the process as a background process on Linux/Unix.
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Skip it if your OS doesn’t support this syntax. Your browser should now open
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with the Jupyter interface. If not, open a browser to the link given on the
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command line.</p>
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<p>In the window, open the <code class="docutils literal notranslate"><span class="pre">new</span></code> menu in the top right and start a <code class="docutils literal notranslate"><span class="pre">Django</span> <span class="pre">Shell-Plus</span></code> notebook (or
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open an existing one if you had one from before). In the first cell you must initialize
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Evennia like so:</p>
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<div class="highlight-python notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">evennia</span>
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<span class="n">evennia</span><span class="o">.</span><span class="n">_init</span><span class="p">()</span>
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</pre></div>
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</div>
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<p><em>Note that the above initialization must be run every time a new new notebook/kernel is started or restarted.</em></p>
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<p>After this you can import and access all of the Evennia system, same as with <code class="docutils literal notranslate"><span class="pre">evennia</span> <span class="pre">shell</span></code>.</p>
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</section>
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<section id="more-exploration">
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<h3>More exploration<a class="headerlink" href="#more-exploration" title="Permalink to this headline">¶</a></h3>
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<p>You can complement your exploration by peeking at the sections of the much more detailed
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<a class="reference internal" href="../Components/Components-Overview.html"><span class="doc std std-doc">Evennia Component overview</span></a>. The <a class="reference internal" href="../Howtos/Howtos-Overview.html"><span class="doc std std-doc">Tutorials</span></a> section also contains a growing collection
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of system- or implementation-specific help.</p>
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</section>
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</section>
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<section id="use-a-python-syntax-checker">
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<h2>Use a python syntax checker<a class="headerlink" href="#use-a-python-syntax-checker" title="Permalink to this headline">¶</a></h2>
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<p>Evennia works by importing your own modules and running them as part of the server. Whereas Evennia
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should just gracefully tell you what errors it finds, it can nevertheless be a good idea for you to
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check your code for simple syntax errors <em>before</em> you load it into the running server. There are
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many python syntax checkers out there. A fast and easy one is
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<a class="reference external" href="https://pypi.python.org/pypi/pyflakes">pyflakes</a>, a more verbose one is
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<a class="reference external" href="https://www.pylint.org/">pylint</a>. You can also check so that your code looks up to snuff using
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<a class="reference external" href="https://pypi.python.org/pypi/pep8">pep8</a>. Even with a syntax checker you will not be able to catch
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every possible problem - some bugs or problems will only appear when you actually run the code. But
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using such a checker can be a good start to weed out the simple problems.</p>
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</section>
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<section id="plan-before-you-code">
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<h2>Plan before you code<a class="headerlink" href="#plan-before-you-code" title="Permalink to this headline">¶</a></h2>
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<p>Before you start coding away at your dream game, take a look at our <a class="reference internal" href="../Howtos/Beginner-Tutorial/Part2/Beginner-Tutorial-Game-Planning.html"><span class="doc std std-doc">Game Planning</span></a>
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page. It might hopefully help you avoid some common pitfalls and time sinks.</p>
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</section>
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<section id="code-in-your-game-folder-not-in-the-evennia-repository">
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<h2>Code in your game folder, not in the evennia/ repository<a class="headerlink" href="#code-in-your-game-folder-not-in-the-evennia-repository" title="Permalink to this headline">¶</a></h2>
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<p>As part of the Evennia setup you will create a game folder to host your game code. This is your
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home. You should <em>never</em> need to modify anything in the <code class="docutils literal notranslate"><span class="pre">evennia</span></code> library (anything you download
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from us, really). You import useful functionality from here and if you see code you like, copy&paste
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it out into your game folder and edit it there.</p>
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<p>If you find that Evennia doesn’t support some functionality you need, make a Feature Request about it. Same goes for bugs. If you add features or fix bugs yourself, please consider <a class="reference internal" href="../Contributing.html"><span class="doc std std-doc">Contributing</span></a> your changes upstream!</p>
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</section>
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<section id="learn-to-read-tracebacks">
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<h2>Learn to read tracebacks<a class="headerlink" href="#learn-to-read-tracebacks" title="Permalink to this headline">¶</a></h2>
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<p>Python is very good at reporting when and where things go wrong. A <em>traceback</em> shows everything you
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need to know about crashing code. The text can be pretty long, but you usually are only interested
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in the last bit, where it says what the error is and at which module and line number it happened -
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armed with this info you can resolve most problems.</p>
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<p>Evennia will usually not show the full traceback in-game though. Instead the server outputs errors
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to the terminal/console from which you started Evennia in the first place. If you want more to show
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in-game you can add <code class="docutils literal notranslate"><span class="pre">IN_GAME_ERRORS</span> <span class="pre">=</span> <span class="pre">True</span></code> to your settings file. This will echo most (but not all)
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tracebacks both in-game as well as to the terminal/console. This is a potential security problem
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though, so don’t keep this active when your game goes into production.</p>
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<blockquote>
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<div><p>A common confusing error is finding that objects in-game are suddenly of the type <code class="docutils literal notranslate"><span class="pre">DefaultObject</span></code>
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rather than your custom typeclass. This happens when you introduce a critical Syntax error to the
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module holding your custom class. Since such a module is not valid Python, Evennia can’t load it at
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all. Instead of crashing, Evennia will then print the full traceback to the terminal/console and
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temporarily fall back to the safe <code class="docutils literal notranslate"><span class="pre">DefaultObject</span></code> until you fix the problem and reload.</p>
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</div></blockquote>
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</section>
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<section id="docs-are-here-to-help-you">
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<h2>Docs are here to help you<a class="headerlink" href="#docs-are-here-to-help-you" title="Permalink to this headline">¶</a></h2>
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<p>Some people find reading documentation extremely dull and shun it out of principle. That’s your
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call, but reading docs really <em>does</em> help you, promise! Evennia’s documentation is pretty thorough
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and knowing what is possible can often give you a lot of new cool game ideas. That said, if you
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can’t find the answer in the docs, don’t be shy to ask questions! The <a class="reference external" href="https://sites.google.com/site/evenniaserver/discussions">discussion
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group</a> and the <a class="reference external" href="https://webchat.freenode.net/?channels=evennia">irc
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chat</a> are also there for you.</p>
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</section>
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<section id="the-most-important-point">
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<h2>The most important point<a class="headerlink" href="#the-most-important-point" title="Permalink to this headline">¶</a></h2>
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<p>And finally, of course, have fun!</p>
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</section>
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</section>
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</div>
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</div>
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</div>
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<h3>Navigation</h3>
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>next</a> |</li>
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<li class="right" >
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>previous</a> |</li>
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<li class="nav-item nav-item-0"><a href="../index.html">Evennia 1.0-dev</a> »</li>
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<li class="nav-item nav-item-1"><a href="Coding-Overview.html" >Coding and development help</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Coding Introduction</a></li>
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</ul>
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<div class="develop">develop branch</div>
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© Copyright 2022, The Evennia developer community.
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