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<h1>
List all files in a directory
</h1>
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<time class="published" datetime="2018-09-14T22:11:00+02:00">
14 septembre 2018
</time>
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<li>Python</li>
<li>Basic</li>
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<div class='article_content'>
<h2>Listing all the files in a directory</h2>
<p>Let's start with the basics, the most staigthforward way to list all the files in a direcoty is to use a combinaison of the listdir function and isfile form os.path. You can use a list comprehension to store all the results in a list.</p>
<div class="highlight"><pre><span></span><span class="n">mypath</span> <span class="o">=</span> <span class="s2">&quot;./test_directory/&quot;</span>
</pre></div>
<div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">os</span> <span class="kn">import</span> <span class="n">listdir</span>
<span class="kn">from</span> <span class="nn">os.path</span> <span class="kn">import</span> <span class="n">isfile</span><span class="p">,</span> <span class="n">join</span>
<span class="p">[</span><span class="n">f</span> <span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">listdir</span><span class="p">(</span><span class="n">mypath</span><span class="p">)</span> <span class="k">if</span> <span class="n">isfile</span><span class="p">(</span><span class="n">join</span><span class="p">(</span><span class="n">mypath</span><span class="p">,</span> <span class="n">f</span><span class="p">))]</span>
</pre></div>
<div class="highlight"><pre><span></span>[&#39;logfile.log&#39;, &#39;myfile.txt&#39;, &#39;super_music.mp3&#39;, &#39;textfile.txt&#39;]
</pre></div>
<h2>Listing all the files of a certain type in a directory</h2>
<p>similarly, if you want to filter only a certain kind of file based on its extension you can use the endswith method. In the following example, we will filter all the "txt" files contained in the directory</p>
<div class="highlight"><pre><span></span><span class="p">[</span><span class="n">f</span> <span class="k">for</span> <span class="n">f</span> <span class="ow">in</span> <span class="n">listdir</span><span class="p">(</span><span class="n">mypath</span><span class="p">)</span> <span class="k">if</span> <span class="n">f</span><span class="o">.</span><span class="n">endswith</span><span class="p">(</span><span class="s1">&#39;.&#39;</span> <span class="o">+</span> <span class="s2">&quot;txt&quot;</span><span class="p">)]</span>
</pre></div>
<div class="highlight"><pre><span></span>[&#39;myfile.txt&#39;, &#39;textfile.txt&#39;]
</pre></div>
<h2>Listing all the files matching a pattern in a directory</h2>
<p>The glob module finds all the pathnames matching a specified pattern according to the rules used by the Unix shell. You can use the *, ?, and character ranges expressed with [] wildcards</p>
<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">glob</span>
<span class="n">glob</span><span class="o">.</span><span class="n">glob</span><span class="p">(</span><span class="s2">&quot;*.txt&quot;</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span>[&#39;myfile.txt&#39;]
</pre></div>
<h2>Listing files recusively</h2>
<p>If you want to list all files recursively you can select all the sub-directories using the "**" wildcard</p>
<div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">glob</span>
<span class="n">glob</span><span class="o">.</span><span class="n">glob</span><span class="p">(</span><span class="n">mypath</span> <span class="o">+</span> <span class="s1">&#39;/**/*.txt&#39;</span><span class="p">,</span> <span class="n">recursive</span><span class="o">=</span><span class="bp">True</span><span class="p">)</span>
</pre></div>
<div class="highlight"><pre><span></span>[&#39;./test_directory\\myfile.txt&#39;,
&#39;./test_directory\\textfile.txt&#39;,
&#39;./test_directory\\subdir1\\file_hidden_in_a_sub_direcotry.txt&#39;]
</pre></div>
<h3>Using a regular expression</h3>
<p>If you'd rather use a regular expression to select the files, the pathlib library provides the rglob function. </p>
<div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">pathlib</span> <span class="kn">import</span> <span class="n">Path</span>
<span class="nb">list</span><span class="p">(</span><span class="n">Path</span><span class="p">(</span><span class="s2">&quot;./test_directory/&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">rglob</span><span class="p">(</span><span class="s2">&quot;*.[tT][xX][tT]&quot;</span><span class="p">))</span>
</pre></div>
<div class="highlight"><pre><span></span>[WindowsPath(&#39;test_directory/myfile.txt&#39;),
WindowsPath(&#39;test_directory/textfile.txt&#39;),
WindowsPath(&#39;test_directory/subdir1/file_hidden_in_a_sub_direcotry.txt&#39;)]
</pre></div>
<p>Using regular expressions you can for example select multiple types of files. In the following example, we list all the files that finish either with "txt" or with "log".</p>
<div class="highlight"><pre><span></span><span class="nb">list</span><span class="p">(</span><span class="n">Path</span><span class="p">(</span><span class="s2">&quot;./test_directory/&quot;</span><span class="p">)</span><span class="o">.</span><span class="n">rglob</span><span class="p">(</span><span class="s2">&quot;*.[tl][xo][tg]&quot;</span><span class="p">))</span>
</pre></div>
<div class="highlight"><pre><span></span>[WindowsPath(&#39;test_directory/logfile.log&#39;),
WindowsPath(&#39;test_directory/myfile.txt&#39;),
WindowsPath(&#39;test_directory/textfile.txt&#39;),
WindowsPath(&#39;test_directory/subdir1/file_hidden_in_a_sub_direcotry.txt&#39;)]
</pre></div>
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