valueerror: excel file format cannot be determined, you must specify an engine manually. in python

When trying to read an excel file using pandas.read_excel method, we might face an error "ValueError: Excel file format cannot be determined, you must specify an engine manually". This error occurs because pandas is unable to automatically detect the Excel file format, so we must specify the engine that should be used for parsing the file.

To solve this error, we need to explicitly tell pandas to use the engine that can parse Excel files by installing the following package:

main.py
pip install openpyxl
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Then, in the pandas.read_excel method we should pass the engine parameter with the value openpyxl like this:

main.py
import pandas as pd

df = pd.read_excel("path/to/excel/file.xlsx", engine="openpyxl")
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This will inform pandas to use the openpyxl engine to read the Excel file instead of the default one. By doing so, we can avoid the "ValueError: Excel file format cannot be determined, you must specify an engine manually" error.