drop_duplicates not working in pandas?

Question

The purpose of my code is to import 2 Excel files, compare them, and print out the differences to a new Excel file.

However, after concatenating all the data, and us

Answer 1

I have just had this issue, and this was not the solution.

It may be in the docs - I admittedly havent looked - and crucially this is only when dealing with date-based unique rows: the 'date' column must be formatted as such.

If the date data is a pandas object dtype, the drop_duplicates will not work - do a pd.to_datetime first.