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<chris.barker@noaa.gov> wrote in message 
news:281f5806-8793-4fd2-877c-214927ddaf10@googlegroups.com...
>
> 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' 
predictably failed.

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.

Very smooth.

Frank