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<li><a class="reference internal" href="#">Conditional Statements</a><ul>
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<li><a class="reference internal" href="#if-statement">If Statement</a></li>
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<div class="section" id="conditional-statements">
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<span id="id1"></span><h1>Conditional Statements<a class="headerlink" href="#conditional-statements" title="Permalink to this headline"> link</a></h1>
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<p>Ren'Py includes several statements that can alter control flow based on
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expression values. This is in addition to the <a class="reference internal" href="label.html#jump-statement"><span class="std std-ref">jump</span></a>,
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<a class="reference internal" href="label.html#call-statement"><span class="std std-ref">call</span></a> and <a class="reference internal" href="label.html#return-statement"><span class="std std-ref">return</span></a> statements,
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which transfer control unconditionally.</p>
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<p>Note that is pages discusses statements that can be used inside Ren'Py
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script. Python embedded in a Ren'Py game uses the Python while, if,
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and for statements, but can't embed Ren'Py script statements.</p>
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<div class="section" id="if-statement">
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<span id="id2"></span><h2>If Statement<a class="headerlink" href="#if-statement" title="Permalink to this headline"> link</a></h2>
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<p>The <code class="docutils literal notranslate"><span class="pre">if</span></code> statement conditionally executes a block of statements if a Python
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expression is true. It consists of an <code class="docutils literal notranslate"><span class="pre">if</span></code> clause, zero or more <code class="docutils literal notranslate"><span class="pre">elif</span></code>
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clauses, and an optional <code class="docutils literal notranslate"><span class="pre">else</span></code> clause.</p>
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<p>Each clause should be on its own logical line, followed by a block of
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statements. The if and elif clauses are followed by an expression,
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while all clauses end with a colon <code class="docutils literal notranslate"><span class="pre">:</span></code>.</p>
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<p>Examples are:</p>
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<div class="highlight-renpy notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">flag</span><span class="p">:</span>
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<span class="n">e</span> <span class="s2">"You've set the flag!"</span>
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</pre></div>
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</div>
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<div class="highlight-renpy notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">points</span> <span class="o">>=</span> <span class="mi">10</span><span class="p">:</span>
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<span class="k">jump</span> <span class="n">best_ending</span>
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<span class="k">elif</span> <span class="n">points</span> <span class="o">>=</span> <span class="mi">5</span><span class="p">:</span>
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<span class="k">jump</span> <span class="n">good_ending</span>
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<span class="k">elif</span> <span class="n">points</span> <span class="o">>=</span> <span class="mi">1</span><span class="p">:</span>
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<span class="k">jump</span> <span class="n">bad_ending</span>
|
||
|
|
<span class="k">else</span><span class="p">:</span>
|
||
|
|
<span class="k">jump</span> <span class="n">worst_ending</span>
|
||
|
|
</pre></div>
|
||
|
|
</div>
|
||
|
|
<p>The expressions in the if statement are evaluated in order, from
|
||
|
|
first to last. When an expression evaluates to true, the block
|
||
|
|
corresponding to that statement is executed. When control reaches the
|
||
|
|
end of the block, it proceeds to the statement following the if
|
||
|
|
statement.</p>
|
||
|
|
<p>If all expressions evaluate to false, the block associated with
|
||
|
|
the <code class="docutils literal notranslate"><span class="pre">else</span></code> clause is executed, if the <code class="docutils literal notranslate"><span class="pre">else</span></code> clause is present.</p>
|
||
|
|
</div>
|
||
|
|
<div class="section" id="while-statement">
|
||
|
|
<span id="id3"></span><h2>While Statement<a class="headerlink" href="#while-statement" title="Permalink to this headline"> link</a></h2>
|
||
|
|
<p>The <code class="docutils literal notranslate"><span class="pre">while</span></code> statement executes a block of statements while an expression
|
||
|
|
evaluates True. For example:</p>
|
||
|
|
<div class="highlight-renpy notranslate"><div class="highlight"><pre><span></span><span class="k">$</span> <span class="n">count</span> <span class="o">=</span> <span class="mi">10</span>
|
||
|
|
|
||
|
|
<span class="k">while</span> <span class="n">count</span> <span class="o">></span> <span class="mi">0</span><span class="p">:</span>
|
||
|
|
|
||
|
|
<span class="s2">"T-minus [count]."</span>
|
||
|
|
|
||
|
|
<span class="k">$</span> <span class="n">count</span> <span class="o">-=</span> <span class="mi">1</span>
|
||
|
|
|
||
|
|
<span class="s2">"Liftoff!"</span>
|
||
|
|
</pre></div>
|
||
|
|
</div>
|
||
|
|
<div class="highlight-renpy notranslate"><div class="highlight"><pre><span></span><span class="k">$</span> <span class="n">lines</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"sounds/three.mp3"</span><span class="p">,</span> <span class="s2">"sounds/two.mp3"</span><span class="p">,</span> <span class="s2">"sounds/one.mp3"</span><span class="p">]</span>
|
||
|
|
<span class="k">while</span> <span class="n">lines</span><span class="p">:</span> <span class="c1"># evaluates to True as long as the list is not empty</span>
|
||
|
|
<span class="k">play</span> <span class="k">sound</span> <span class="n">lines</span><span class="o">.</span><span class="n">pop</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span> <span class="c1"># removes the first element</span>
|
||
|
|
<span class="k">pause</span>
|
||
|
|
</pre></div>
|
||
|
|
</div>
|
||
|
|
<div class="highlight-renpy notranslate"><div class="highlight"><pre><span></span><span class="k">while</span> <span class="kc">True</span><span class="p">:</span>
|
||
|
|
|
||
|
|
<span class="s2">"This is the song that never terminates."</span>
|
||
|
|
<span class="s2">"It goes on and on, my compatriots."</span>
|
||
|
|
</pre></div>
|
||
|
|
</div>
|
||
|
|
<p>The expression is evaluated when while statement is first reached, and
|
||
|
|
then each time control reaches the end of the block. When the expression
|
||
|
|
returns a false value, the statement after the while statement is executed.</p>
|
||
|
|
<p>Ren'Py does not have continue, break, or for statements. Continue and break
|
||
|
|
statements can be replaced by jumps to labels placed before or after the
|
||
|
|
while loop, respectively. The first example of a while loop, above, shows
|
||
|
|
how a while loop can replace a simple for statement. The second shows
|
||
|
|
how it can replace a for statement which iterates through a list (also
|
||
|
|
known as a foreach statement in other programming languages).</p>
|
||
|
|
</div>
|
||
|
|
<div class="section" id="pass-statement">
|
||
|
|
<span id="id4"></span><h2>Pass Statement<a class="headerlink" href="#pass-statement" title="Permalink to this headline"> link</a></h2>
|
||
|
|
<p>The <code class="docutils literal notranslate"><span class="pre">pass</span></code> statement can be used when a block is required, but no
|
||
|
|
statement is suitable. It does nothing.</p>
|
||
|
|
<p>For example:</p>
|
||
|
|
<div class="highlight-renpy notranslate"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="n">points</span> <span class="o">>=</span> <span class="mi">10</span><span class="p">:</span>
|
||
|
|
<span class="s2">"You're doing great!"</span>
|
||
|
|
<span class="k">elif</span> <span class="n">points</span> <span class="o">>=</span> <span class="mi">1</span><span class="p">:</span>
|
||
|
|
<span class="k">pass</span>
|
||
|
|
<span class="k">else</span><span class="p">:</span>
|
||
|
|
<span class="s2">"Things aren't looking so good."</span>
|
||
|
|
</pre></div>
|
||
|
|
</div>
|
||
|
|
<div class="highlight-renpy notranslate"><div class="highlight"><pre><span></span><span class="c1"># event.step() is a function that returns True while there are</span>
|
||
|
|
<span class="c1"># still events that need to be executed.</span>
|
||
|
|
|
||
|
|
<span class="k">while</span> <span class="k">event</span><span class="o">.</span><span class="n">step</span><span class="p">():</span>
|
||
|
|
<span class="k">pass</span>
|
||
|
|
</pre></div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
</div>
|
||
|
|
|
||
|
|
</div>
|
||
|
|
</div>
|
||
|
|
<footer class="footer">
|
||
|
|
<div class="container">
|
||
|
|
<p class="pull-right">
|
||
|
|
<a href="#">Back to top</a>
|
||
|
|
|
||
|
|
</p>
|
||
|
|
<p>
|
||
|
|
© Copyright 2012-2022, Tom Rothamel.<br/>
|
||
|
|
Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.8.6.<br/>
|
||
|
|
</p>
|
||
|
|
</div>
|
||
|
|
</footer>
|
||
|
|
</body>
|
||
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</html>
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