title: Dataframe show a boxplot for each day
body: <p>i got a DataFrmae(choosen_merged):</p>
  <p><a href="https://i.stack.imgur.com/12FTp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/12FTp.png" alt="enter image description here" /></a></p>
  <pre><code>        ax = choosen_merged.boxplot()
          ax.set_title(&quot;Boxplot&quot;+&quot; Sensor: &quot;+f&quot;{pick_column}&quot;+&quot; &quot;+f&quot;{df_date}&quot;)
          #ax.set_xlabel(&quot;x_label&quot;)
          ax.set_ylabel(f&quot;{a_string}&quot;)
          plt.show()
  </code></pre>
  <p>Output:</p>
  <p><a href="https://i.stack.imgur.com/PfyFt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PfyFt.png" alt="enter image description here" /></a></p>
  <p><strong>Objective:</strong>
  I would like to get a boxplot for each day from my df.</p>
  <p><strong>Solution approach:</strong></p>
  <p>have found a similar approach, but unfortunately it does not help me further <a href="https://stackoverflow.com/questions/26507404/time-series-boxplot-in-pandas">Time-series boxplot in pandas</a></p>
  <p>The last answer also works with timestamps but in the index. How can I apply it to a column?</p>