Why on earth would you want to use ebooklib with calibre, calibre contains far more capable code to read ebook formats. And no you dont need to install using venv, venv is just a crutch for people that dont take the time to understand how python importing works. Just download ebooklib wheel and add the path to the wheel to sys.path and then import it. Or unzip the whl file and add the path to the top level directory containing the top level __init__.py to sys.path and import it.
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