title: #@save definition and importance python
body: <p>I have seen this <code>#@save</code> in multiple instances in python most often in Jupyter and Colab notebooks. Please explain the usage of this operator, the importance, and how to use it. An example is shown below.</p>
  <pre><code>#@save
  import collections
  from collections import defaultdict
  from IPython import display
  </code></pre>