Detect Duplicate Orders in Excel with Python and Pandas

Introduction

In a Python community a user asked how to identify duplicate orders within a month using Python on data stored in Excel. This article shares a solution.

Approach

The idea is to add a year‑month column to the data and then check for duplicates.

Implementation with Excel formulas

One can create a year‑month column using the formula: =name&code&text(enter_time,"yyyymm") Then apply COUNTIF on that column and flag rows where the count is greater than 1, optionally using conditional formatting to highlight duplicates.

Implementation with Pandas

Using Python’s Pandas library the same task can be performed more flexibly. The following screenshot illustrates the Pandas solution.

Conclusion

The article demonstrates how to use Python to process Excel data for duplicate order detection, providing both a pure‑Excel formula method and a Pandas‑based script.