From 2964320169db8c52fed6cd4ebf6457f2cf2b8d08 Mon Sep 17 00:00:00 2001 From: Antony Lee Date: Tue, 28 Jan 2020 17:54:04 +0100 Subject: [PATCH] Backport PR #16330: Clearer signal handling --- lib/matplotlib/backends/backend_qt5.py | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py index ee15bfbf369d..b2bd2d564a39 100644 --- a/lib/matplotlib/backends/backend_qt5.py +++ b/lib/matplotlib/backends/backend_qt5.py @@ -1043,11 +1043,12 @@ def trigger_manager_draw(manager): def mainloop(): old_signal = signal.getsignal(signal.SIGINT) # allow SIGINT exceptions to close the plot window. - if old_signal: + is_python_signal_handler = old_signal is not None + if is_python_signal_handler: signal.signal(signal.SIGINT, signal.SIG_DFL) try: qApp.exec_() finally: # reset the SIGINT exception handler - if old_signal: + if is_python_signal_handler: signal.signal(signal.SIGINT, old_signal) pFad - Phonifier reborn

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