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<h1>
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Write a value to a config file
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</h1>
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<ol class="breadcrumb">
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<time class="published" datetime="2019-08-09T11:17:00+02:00">
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09 août 2019
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</li>
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<li>Python</li>
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<li>Basics</li>
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<div class='article_content'>
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<p>You can store variables in an ini file for later executions of the script instead of hardcoding the values in the script. ConfigParser can take a pointer to a file an write values to that file using the ini syntaxe</p>
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<div class="highlight"><pre><span></span><span class="n">config</span> <span class="o">=</span> <span class="n">ConfigParser</span><span class="p">()</span>
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<span class="n">config</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="s2">"file.ini"</span><span class="p">)</span>
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<span class="n">config</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="s2">"my_section"</span><span class="p">,</span> <span class="s2">"my_param"</span><span class="p">,</span> <span class="s2">"my_value"</span><span class="p">)</span>
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<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s2">"file.ini"</span><span class="p">,</span> <span class="s2">"w"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
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<span class="n">config</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
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</pre></div>
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<p>Here is a function designed to help you update ini files</p>
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<div class="highlight"><pre><span></span><span class="k">def</span> <span class="nf">saveParam</span><span class="p">(</span><span class="n">pathToFile</span><span class="p">,</span> <span class="n">section</span><span class="p">,</span> <span class="n">param</span><span class="p">,</span> <span class="n">value</span><span class="p">):</span>
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<span class="sd">"""</span>
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<span class="sd"> Save/add value to an ini file </span>
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<span class="sd"> pathToFile : string, path to the ini file </span>
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<span class="sd"> section : string, name of the section to write to</span>
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<span class="sd"> param : string, name of the parameter to write the value to </span>
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<span class="sd"> value : value to be written to the parameter</span>
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<span class="sd"> If the file doesn't exist, it will be created</span>
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<span class="sd"> If the section doesn't exist, it will be created</span>
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<span class="sd"> """</span>
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<span class="n">config</span> <span class="o">=</span> <span class="n">ConfigParser</span><span class="p">()</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">pathToFile</span><span class="p">):</span>
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<span class="c1">#create the file if it does not exist</span>
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<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">pathToFile</span><span class="p">,</span> <span class="s2">"w"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
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<span class="k">pass</span>
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<span class="n">config</span><span class="o">.</span><span class="n">read</span><span class="p">(</span><span class="n">pathToFile</span><span class="p">)</span>
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<span class="k">if</span> <span class="ow">not</span> <span class="n">config</span><span class="o">.</span><span class="n">has_section</span><span class="p">(</span><span class="n">section</span><span class="p">):</span>
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<span class="c1">#create the section if it does not exist</span>
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<span class="n">config</span><span class="o">.</span><span class="n">add_section</span><span class="p">(</span><span class="n">section</span><span class="p">)</span>
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<span class="n">config</span><span class="o">.</span><span class="n">set</span><span class="p">(</span><span class="n">section</span><span class="p">,</span> <span class="n">param</span><span class="p">,</span> <span class="n">value</span><span class="p">)</span>
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<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">pathToFile</span><span class="p">,</span> <span class="s2">"w"</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
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<span class="c1">#write value to the file</span>
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<span class="n">config</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">f</span><span class="p">)</span>
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</pre></div>
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