nbconvert requires mistune You get a cryptic error message from iptest if mistune is not installed. Test group: nbconvert E ====================================================================== ERROR: Failure: AttributeError ('module' object has no attribute 'nbconvert') ---------------------------------------------------------------------- Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/nose/loader.py", line 403, in loadTestsFromName module = resolve_name(addr.module) File "/usr/lib/python2.7/dist-packages/nose/util.py", line 321, in resolve_name obj = getattr(obj, part) AttributeError: 'module' object has no attribute 'nbconvert' ---------------------------------------------------------------------- Ran 1 test in 0.001s FAILED (errors=1