Thomas Kluyver

Have a look at [ipycache](https://github.com/rossant/ipycache) if you have long-running cells that you don't always want to re-run. I don't think we want to get into defining a DAG of cells.

Thanks, I think this makes sense, if people are going to rely on this new-ish pip feature to make virtualenvs without pip inside. Sorry it's taken me a while to...

> What's odd is that the except clause doesn't catch it The except clause does catch it, but then there's another AttributeError inside the except clause (`During handling of the...

Do you have any unusual config in Firefox, such as blocking cookies?

I don't know, sorry. But the defaults should be fine, so unless you know that you've configured it to ignore cookies or something, it's probably not that. What about browser...

That's essentially disabling all security, which we don't recommend. You may want to try setting an explicit password by running `jupyter notebook password` at the command line.

There is a new version of the notebook coming out very soon which should fix this. Please test the release candidate if you can! On Tue, 8 May 2018, 1:44...

What version of the notebook do you have (`jupyter notebook --version`)? We fixed a bug relating to that recently.

Try upgrading to 5.5.0

When Jupyter opens the browser for you, it uses a second token which is valid for only one use. This is deliberate, because the command line arguments you launch a...