diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
index 1d3c7cd536ae..2e895195f906 100644
--- a/lib/matplotlib/backends/backend_qt5.py
+++ b/lib/matplotlib/backends/backend_qt5.py
@@ -121,7 +121,7 @@ def _create_qApp():
if display is None or not re.search(r':\d', display):
raise RuntimeError('Invalid DISPLAY variable')
- qApp = QtWidgets.QApplication(["matplotlib"])
+ qApp = QtWidgets.QApplication([b"matplotlib"])
qApp.lastWindowClosed.connect(qApp.quit)
else:
qApp = app
@@ -170,11 +170,8 @@ def wrapper(self, **kwargs):
QtWidgets.QWidget.__init__ = cooperative_qwidget_init
__init__(self, **kwargs)
finally:
- try:
- # Restore __init__ to sip.simplewrapper.__init__.
- del QtWidgets.QWidget.__init__
- except AttributeError:
- pass
+ # Restore __init__
+ QtWidgets.QWidget.__init__ = qwidget_init
return wrapper
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