How to append data in an existing Excel sheet while preserving existing formatting and macros using python

Posted On February 5, 2023

You can use the openpyxl library to append data into an existing Excel sheet while preserving the existing formatting and macros. The library provides the ability to read and write Excel files, including support for preserving existing formatting and macros.

Here’s a simple example of how you can append data to an existing Excel sheet using Python and openpyxl:

import openpyxl

# Load the existing workbook
workbook = openpyxl.load_workbook("existing_file.xlsx")

# Select the active sheet
sheet = workbook.active

# Get the number of rows in the sheet
num_rows = sheet.max_row

# Append the new data to the sheet
sheet.cell(row=num_rows + 1, column=1).value = "new data"

# Save the workbook
workbook.save("existing_file.xlsx")

In this example, we first load the existing Excel workbook using openpyxl.load_workbook, and then select the active sheet using workbook.active. We then get the number of rows in the sheet using sheet.max_row, and append the new data to the next row using sheet.cell. Finally, we save the workbook using workbook.save, ensuring that the existing formatting and macros are preserved.

This is just a simple example, but the openpyxl library provides a variety of features for reading and writing Excel files, including support for formatting, macros, and more. So whether you’re working with large datasets or simple spreadsheets, Python and openpyxl provide the tools you need to manipulate and analyze your data.