From df0e01e031e2e4f238048257d90f94f8a469b374 Mon Sep 17 00:00:00 2001 From: Thomas A Caswell Date: Fri, 24 Jan 2020 21:22:06 -0800 Subject: [PATCH] Backport PR #16311: don't override non-Python signal handlers --- lib/matplotlib/backends/backend_qt5.py | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py index b36e6564287b..181dcb4843f7 100644 --- a/lib/matplotlib/backends/backend_qt5.py +++ b/lib/matplotlib/backends/backend_qt5.py @@ -1091,9 +1091,11 @@ def trigger_manager_draw(manager): def mainloop(): old_signal = signal.getsignal(signal.SIGINT) # allow SIGINT exceptions to close the plot window. - signal.signal(signal.SIGINT, signal.SIG_DFL) + if old_signal: + signal.signal(signal.SIGINT, signal.SIG_DFL) try: qApp.exec_() finally: # reset the SIGINT exception handler - signal.signal(signal.SIGINT, old_signal) + if old_signal: + signal.signal(signal.SIGINT, old_signal) pFad - Phonifier reborn

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