How to Prevent Newly Created Sheets from Being Deleted in Python/Pandas/Openpyxl

Learn how to save newly created sheets in Excel using Python, Pandas, and Openpyxl without losing your data.
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How to Prevent Newly Created Sheets from Being Deleted in Python/Pandas/Openpyxl

When working with Excel files in Python, especially using libraries like Pandas and Openpyxl, you might encounter an issue where newly created sheets unexpectedly disappear. This problem can be frustrating, particularly when you believe you've saved them correctly. In this guide, we'll take a closer look at a common mistake that leads to this issue and provide a clear solution to ensure your sheets stay intact.

The Problem: Sheets Being Deleted

In a provided code example, a user attempted to create a new sheet labeled "Calculation" in an Excel workbook but found that it was missing after certain operations. Initially, the Calculation sheet was present, but a subsequent call to load the workbook overwrote the previous changes, resulting in the sheet being deleted from the final output.

Code Summary

Let’s break down the relevant part of the code that leads to the issue:

[[See Video to Reveal this Text or Code Snippet]]

Here, the problem lies in the second call to openpyxl.load_workbook, which overwrites the workbook instance (wb) at a point where the Calculation sheet should still be present.

The Solution: Save Your Changes Before Re-loading

To prevent this issue from recurring, you can follow these simple steps:

Step 1: Limit Workbook Reloading

Instead of repeatedly loading the workbook throughout your code, do this only at the beginning and save it at the end. This makes sure you don’t lose any changes made.

Step 2: Save and Close Properly

Each time you finish writing data to a new or existing sheet, ensure to save and close the writer before reloading the workbook.

Step 3: Code Adjustment

Here’s a revised version of the initial code where we only load the workbook once at the start and save it at the end:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps and adjusting your code to reduce the frequency of workbook reloads, you can effectively retain your newly created sheets and their content. The key takeaway is to save your workbook’s state after making changes and avoid unnecessary reloads that can lead to the loss of data.

Remember to always check your sheet names to debug any issues regarding visibility after processing your data. Happy coding!

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