diff --git a/lib/matplotlib/backend_bases.py b/lib/matplotlib/backend_bases.py
index f70be0d91b94..b397eb0bf2a0 100644
--- a/lib/matplotlib/backend_bases.py
+++ b/lib/matplotlib/backend_bases.py
@@ -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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