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<li class="nav-item nav-item-0"><a href="index.html">Evennia 0.9.5</a> »</li>
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<li class="nav-item nav-item-this"><a href="">Coding Introduction</a></li>
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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="python">
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<h2>Python<a class="headerlink" href="#python" title="Permalink to this headline">¶</a></h2>
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<p>Evennia is developed using Python. Even if you are more of a designer than a coder, it is wise to
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learn how to read and understand basic Python code. If you are new to Python, or need a refresher,
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take a look at our two-part <a class="reference internal" href="Python-basic-introduction.html"><span class="doc std std-doc">Python introduction</span></a>.</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>When new to Evennia it can be hard to find things or figure out what is available. Evennia offers a
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special interactive python shell that allows you to experiment and try out things. It’s recommended
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to use <a class="reference external" href="http://ipython.org/">ipython</a> for this since the vanilla python prompt is very limited. Here
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are some simple commands to get started:</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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pip install ipython # [only needed the first time]
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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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<p>That is, enter <code class="docutils literal notranslate"><span class="pre">evennia.</span></code> and press the <code class="docutils literal notranslate"><span class="pre"><TAB></span></code> key. This will show you all the resources made
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available at the top level of Evennia’s “flat API”. See the <a class="reference internal" href="Evennia-API.html"><span class="doc std std-doc">flat API</span></a> page for more
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info on how to explore it efficiently.</p>
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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="Developer-Central.html"><span class="doc std std-doc">Developer Central</span></a>. The <a class="reference internal" href="Tutorials.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 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="http://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="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
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<a class="reference external" href="https://github.com/evennia/evennia/issues/new/choose">Feature Request</a> about it. Same goes for <a class="reference external" href="https://github.com/evennia/evennia/issues/new/choose">bugs</a>. If you add features or fix bugs
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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
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<a class="reference external" href="https://sites.google.com/site/evenniaserver/discussions">discussion group</a> and the
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<a class="reference external" href="http://webchat.freenode.net/?channels=evennia">irc 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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<p class="logo"><a href="index.html">
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<img class="logo" src="_static/evennia_logo.png" alt="Logo"/>
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</a></p>
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<h3 id="searchlabel">Quick search</h3>
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<p><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="#python">Python</a></li>
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<li><a class="reference internal" href="#explore-evennia-interactively">Explore Evennia interactively</a></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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<div role="note" aria-label="source link">
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<!--h3>This Page</h3-->
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<ul class="this-page-menu">
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<li><a href="_sources/Coding-Introduction.md.txt"
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rel="nofollow">Show Page Source</a></li>
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</ul>
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</div><h3>Links</h3>
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<ul>
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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><a href="http://webchat.freenode.net/?channels=evennia&uio=MT1mYWxzZSY5PXRydWUmMTE9MTk1JjEyPXRydWUbb">IRC</a> -
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<a href="https://discord.gg/NecFePw">Discord</a> -
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<a href="https://groups.google.com/forum/#%21forum/evennia">Forums</a>
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</li>
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<li><a href="http://evennia.blogspot.com/">Evennia Dev blog</a> </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="../1.0-dev/index.html">1.0-dev (develop branch)</a></li>
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<li><a href="Coding-Introduction.html">0.9.5 (v0.9.5 branch)</a></li>
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</ul>
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<h3>Navigation</h3>
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