# Introduction The `last_valid_index()` method in pandas is used to get the index of the last non-null/NaN value in a DataFrame. It returns a scalar value that represents the index. If all the elements are non-null/NaN, it returns `None`. If the DataFrame is empty, it also returns `None`. This method is helpful for finding the position of the last non-null/NaN value in a DataFrame. ## VM Tips After the VM startup is done, click the top left corner to switch to the **Notebook** tab to access Jupyter Notebook for practice. Sometimes, you may need to wait a few seconds for Jupyter Notebook to finish loading. The validation of operations cannot be automated because of limitations in Jupyter Notebook. If you face issues during learning, feel free to ask Labby. Provide feedback after the session, and we will promptly resolve the problem for you.
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