How to stop bokeh from opening a new tab in Jupyter Notebook?

Adding an explicit example to @bigreddot's answer:

You might have ran bokeh.io.output_file() somewhere in your notebook, to save noteable graphs. However, now you only want to experiment with some plots quickly to inspect the data.

Simply reset your settings to stop saving to file in any cell in your notebook like so:

import bokeh.io
# this is here only for completeness to clarify where
# the methods are nested (you probably already imported this earlier)


bokeh.io.reset_output()
bokeh.io.output_notebook()

You can activate saving to file again later to keep the interesting graphs.

You need to call output_notebook at the top of your notebook, but only call output_notebook. If you call output_file at all, that activates a persistent mode that saves output to files, and causes show to open new tabs with those files. You would need to call reset_output to clear that persistent mode.

As a convenience, since several users asked for it, if no output mode is supplied, show behaves as though output_file was called as a default. The reason a tab is not opened from the Binder tutorial is because it is not technically possible for code running remotely on Binder server to open a tab on your local browser (which is a very good thing).