FWIW, I strongly recommend these python3 packages be required not optional. Sigil is going to start using its embedded python interpreter more to implement many of the epub3 related features. Especially when it tries to implement support for fixed format epubs. So even internal Sigil python code, not just plugins, will start to use those packages the way they use lxml right now. It will also reduce the number of bug reports on linux like this one.
Thanks,
KevinH
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