<chris.bar...@noaa.gov> wrote in message
> pip looked and saw that you already had it, so did nothing -- what did it
> report? In this caes:
> 'pip install -U ipython[notebook]'
> might have worked: -U means upgrade even if I already have it.
Indeed it did - thanks for the tip.
I used pip to uninstall jinja2. Afterwards, running 'ipython notebook'
Then I ran the above command to upgrade ipython notebook. It figured out
that jinja2 was missing and re-installed it. Now it works again.