title: what just these code do "os.chdir("..")"?
body: <p>I saw these code</p>
  <pre><code>open(new_user + &quot;.database&quot;, &quot;a&quot;)
          with open(new_user + &quot;.database&quot;, &quot;w&quot;) as f:
              f.write(encrypted)
          os.chdir(&quot;..&quot;)
          os.chdir(&quot;..&quot;)
  </code></pre>
  <p>And don't know exactly what does this do</p>
  <pre><code>os.chdir(&quot;..&quot;)
  </code></pre>