It seems to me as though the installation has messed up somehow. Try running:
# For Python 2 pip install --upgrade --force-reinstall --no-cache-dir jupyter # For Python 3 pip3 install --upgrade --force-reinstall --no-cache-dir jupyter
This should reinstall everything from PyPi. This should solve the problem as I think running pip install "ipython[notebook]"
messed things up.
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