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nbformat==4.4.0
is incompatible with Python 3.9 because it relies on the now-removedencodestring
function inbase64
.I bumped
nbformat
to 5.1.3, added Python 3.9 as a tox test environment, and ran the tests for 3.6, 3.7, 3.8, and 3.9. All passed for me.