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Tutur33
124 lines
5.2 KiB
HTML
124 lines
5.2 KiB
HTML
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<html>
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<head>
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<title>L'instruction if</title>
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<h1 id="topic_header_text">L'instruction if</h1>
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<a href="Lesconditionsinstructionsifelife.html">Les conditions (instructions if, elif, else)</a> ››
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<p></p>
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<h3 class="rvps12"><img alt="" style="padding : 1px;" src="lib/NouvelElement30.png"></h3>
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<h4 class="rvps13"><span class="rvts0"><span class="rvts64">Syntaxe</span></span></h4>
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<p class="rvps8"><span class="rvts47">if</span><span class="rvts39"> expression: </span><span class="rvts40"># ne pas oublier le signe de ponctuation ':'</span><br/><span class="rvts81"> </span><span class="rvts39">bloc d'instructions </span><span class="rvts40"># attention à l'indentation</span><br/><span class="rvts40"># suite du programme</span></p>
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<p class="rvps7"><span class="rvts11">Si l'expression est vraie (</span><span class="rvts12">True</span><span class="rvts11">) alors le bloc d'instructions est exécuté.</span><br/><span class="rvts11">Si l'expression est fausse (</span><span class="rvts12">False</span><span class="rvts11">) on passe directement à la suite du programme.</span></p>
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<p class="rvps7"><span class="rvts11">Nous allons commencer par créer le script </span><span class="rvts17">Condition1.py</span><span class="rvts11"> :</span></p>
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<p class="rvps7"><img alt="" style="padding : 1px;" src="lib/NouvelElement23.png"></p>
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<p class="rvps8"><span class="rvts40"># script Condition1.py</span><br/><span class="rvts39">chaine = </span><span class="rvts41">input</span><span class="rvts39">(</span><span class="rvts53">"Note sur 20 : "</span><span class="rvts39">)</span><br/><span class="rvts39">note = </span><span class="rvts41">float</span><span class="rvts39">(chaine)</span><br/><span class="rvts47">if</span><span class="rvts39"> note >= 10.0:</span><br/><span class="rvts39"> </span><span class="rvts40"># ce bloc est exécuté si l'expression (note >= 10.0) est vraie</span><br/><span class="rvts39"> </span><span class="rvts41">print</span><span class="rvts53">("J'ai la moyenne")</span><br/><span class="rvts41">print</span><span class="rvts53">("Fin du programme")</span></p>
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<p class="rvps7"><span class="rvts11">Pour exécuter le script :</span><br/><span class="rvts11">Cliquer sur exécuter </span><img alt="" style="padding : 1px;" src="lib/NouvelElement7.png"><span class="rvts11"> (ou touche Ctrl + F9) et tester.</span></p>
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<p class="rvps7"><span class="rvts11">Pour une meilleure compréhension des scripts, vous pouvez utiliser le site web PythonTutor et visualiser l'exécution pas à pas: </span><a class="rvts37" href="http://pythontutor.com/visualize.html#mode=edit">http://pythontutor.com/visualize.html#mode=edit</a><span class="rvts11"> </span></p>
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<h3 class="rvps12"><span class="rvts0"><span class="rvts80"><br/></span></span></h3>
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<p></p>
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<p class="rvps4" style="clear: both;"><span class="rvts15">Créé avec HelpNDoc Personal Edition: </span><a class="rvts16" href="https://www.helpndoc.com/fr/tour-des-fonctionnalites">Créer facilement des fichiers Qt Help</a></p>
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