As noted in the release email, linked to from the release tweet and noted in large orange warning that appears on the front page of the documentation, and less orange but still present in the readme on the repo and the release on pypi:
xlrd has explicitly removed support for anything other than xls files.
This is due to potential security vulnerabilities relating to the use of xlrd version 1.2 or earlier for reading .xlsx files.
In your case, the solution is to:
- make sure you are on a recent version of pandas, at least 1.0.1, and preferably the latest release.
- install
openpyxl: https://openpyxl.readthedocs.io/en/stable/ - change your pandas code to be:
pandas.read_excel('cat.xlsx', engine="openpyxl")
Edit: Currently, pandas >= 1.2 addresses this issue. (Release Notes)