Overwrite sheets in Excel with Python

Question

I\'m new to Python (and programming in general) and am running into a problem when writing data out to sheets in Excel.

I\'m reading in an Excel file, performing a

Answer 1

From the pd.DataFrame.to_excel documentation:

Multiple sheets may be written to by specifying unique sheet_name. With all data written to the file it is necessary to save the changes. Note that creating an ExcelWriter object with a file name that already exists will result in the contents of the existing file being erased.

Try writing to the book like

import pandas as pd
df = pd.DataFrame({'col1':[1,2,3],'col2':[4,5,6]})
writer = pd.ExcelWriter('g.xlsx')
df.to_excel(writer, sheet_name = 'first_df')
df.to_excel(writer, sheet_name = 'second_df')
writer.save()

If you inspect the workbook, you will have two worksheets.

Then lets say you wanted to write new data to the same workbook:

writer = pd.ExcelWriter('g.xlsx')
df.to_excel(writer, sheet_name = 'new_df')
writer.save()

If you inspect the workbook now, you will just have one worksheet named new_df

If there are other worksheets in the excel file that you want to keep and just overwrite the desired worksheets, you would need to use load_workbook.

Before you wrtie any data, you could delete the sheets you want to write to with:

std=book.get_sheet_by_name(<sheee_name>)
book.remove_sheet(std)

That will stop the behavior where a number gets appended to the worksheet name once you attempt to write a workbook with a duplicate sheet name.