pandas ExcelWriter Examples

Sample DataFrame context

Sales, customers and summary DataFrames for one report file.

Syntax or pattern

with pd.ExcelWriter("report.xlsx") as writer: ...

✍️

5 practical examples

Export without the index

Save a clean CSV for another tool.

report.to_csv("monthly_report.csv", index=False)

The file does not include the pandas index as an extra column.

Export selected columns

Save only the fields needed by the user.

cols = ["month", "region", "total_sales"]
report[cols].to_csv("summary.csv", index=False)

The export is focused and easier to read.

Write multiple Excel sheets

Create one workbook with several tabs.

with pd.ExcelWriter("report.xlsx") as writer:
    sales_summary.to_excel(writer, sheet_name="Sales", index=False)
    customer_summary.to_excel(writer, sheet_name="Customers", index=False)

The workbook contains separate sheets for each report table.

Round values before export

Make numeric outputs more readable.

report["margin"] = report["margin"].round(2)

The exported report has cleaner numeric values.

Export records to JSON

Create JSON records for an app or API.

report.to_json("report.json", orient="records")

The JSON file stores each row as an object.

Common mistakes to avoid

Changing the original DataFrame before checking the result.
Forgetting to inspect row counts before and after the operation.
Using a pattern without confirming column names and data types.

FAQ

What is the main use of ExcelWriter Examples?

Write multiple DataFrames to different Excel sheets in one workbook.

Should I use this in a notebook or a script?

Both work. Use a notebook while exploring the data, then move the final workflow into a repeatable script when it is stable.

How do I avoid breaking my source data?

Create a copy of the DataFrame before transforming it and check row counts, missing values and sample rows after each important step.

💡 Ideas for You