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Tweak check for IPython pylab mode. #23097

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Merged
merged 1 commit into from
May 22, 2022
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Tweak check for IPython pylab mode. #23097

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11 changes: 4 additions & 7 deletions lib/matplotlib/backend_bases.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3498,14 +3498,11 @@ def show(cls, *, block=None):
if cls.mainloop is None:
return
if block is None:
# Hack: Are we in IPython's pylab mode?
# Hack: Are we in IPython's %pylab mode? In pylab mode, IPython
# (>= 0.10) tacks a _needmain attribute onto pyplot.show (always
# set to False).
from matplotlib import pyplot
try:
# IPython versions >= 0.10 tack the _needmain attribute onto
# pyplot.show, and always set it to False, when in %pylab mode.
ipython_pylab = not pyplot.show._needmain
except AttributeError:
ipython_pylab = False
ipython_pylab = hasattr(pyplot.show, "_needmain")
block = not ipython_pylab and not is_interactive()
# TODO: The above is a hack to get the WebAgg backend working with
# ipython's `%pylab` mode until proper integration is implemented.
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