close_figures, not close_all
Haven't tried to switch it at run time using %config magic though.
$ ipython [qtconsole|notebook|whatever] --help-all
to get all option as examples in config files are **not** updated with IPython.
InlineBackend options
---------------------
--InlineBackend.close_figures=<CBool>
Default: True
Close all figures at the end of each cell.
When True, ensures that each cell starts with no active figures, but it also
means that one must keep track of references in order to edit or redraw
figures in subsequent cells. This mode is ideal for the notebook, where
residual plots from other cells might be surprising.
When False, one must call figure() to create new figures. This means that
gcf() and getfigs() can reference figures created in other cells, and the
active figure can continue to be edited with pylab/pyplot methods that
reference the current active figure. This mode facilitates iterative editing
of figures, and behaves most consistently with other matplotlib backends,
but figure barriers between cells must be explicit.
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