def configure_inline_support(shell, backend):
"""Configure an IPython shell object for matplotlib use.
Parameters
----------
shell : InteractiveShell instance
backend : matplotlib backend
"""
# If using our svg payload backend, register the post-execution
# function that will pick up the results for display. This can only be
# done with access to the real shell object.
# Note: if we can't load the inline backend, then there's no point
# continuing (such as in terminal-only shells in environments without
# zeromq available).
try:
from ipykernel.pylab.backend_inline import InlineBackend
except ImportError:
return
import matplotlib
cfg = InlineBackend.instance(parent=shell)
cfg.shell = shell
if cfg not in shell.configurables:
shell.configurables.append(cfg)
if backend == backends['inline']:
from ipykernel.pylab.backend_inline import flush_figures
shell.events.register('post_execute', flush_figures)
# Save rcParams that will be overwrittern
shell._saved_rcParams = dict()
for k in cfg.rc:
shell._saved_rcParams[k] = matplotlib.rcParams[k]
# load inline_rc
matplotlib.rcParams.update(cfg.rc)
new_backend_name = "inline"
else:
from ipykernel.pylab.backend_inline import flush_figures
try:
shell.events.unregister('post_execute', flush_figures)
except ValueError:
pass
if hasattr(shell, '_saved_rcParams'):
matplotlib.rcParams.update(shell._saved_rcParams)
del shell._saved_rcParams
new_backend_name = "other"
# only enable the formats once -> don't change the enabled formats (which the user may
# has changed) when getting another "%matplotlib inline" call.
# See https://github.com/ipython/ipykernel/issues/29
cur_backend = getattr(configure_inline_support, "current_backend", "unset")
if new_backend_name != cur_backend:
# Setup the default figure format
select_figure_formats(shell, cfg.figure_formats, **cfg.print_figure_kwargs)
configure_inline_support.current_backend = new_backend_name
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