title: Iterate plots through the group by pandas
body: <pre><code>df = 
  
           id_easy    latitude    longitude
  level_0                 
  0        6454       11          3
  0        6454       12          4 
  2        2323       23          5
  2        2323       23          7
  3        25603      13          5 
  3        141        14          6 
  </code></pre>
  
  <p>Want to plot:</p>
  
  <ul>
  <li>first plot: all <code>long</code> and <code>lat</code> values of <code>id_easy</code> <code>6454</code> in one color by showing the first points</li>
  <li>second plot: all <code>long</code> and <code>lat</code> values of <code>id_easy</code> <code>2323</code> in other color by showing the first points</li>
  <li>...</li>
  </ul>
  
  <p>same logic in the <code>len(df)</code></p>
  
  <p>My try:</p>
  
  <pre><code>for index_in_red in df.index.unique():
      plt.plot(df.loc[df.index != index_in_red,'longitude'],df.loc[df.index != index_in_red,'latitude'] ,
               color='silver', marker='o',linestyle='')
  
      plt.plot(df.loc[index_in_red,'longitude'],df.loc[index_in_red,'latitude']  ,
                color='maroon',marker='o',linestyle='')
      plt.show()
  </code></pre>
  
  <p>Desired output:</p>
  
  <p><a href="https://i.stack.imgur.com/DjTh3.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DjTh3.png" alt="enter image description here"></a></p>