Fixed database typo and removed unnecessary class identifier.

venv/Lib/site-packages/matplotlib/backends/backend_qt4agg.py

@@ -0,0 +1,16 @@
+"""
+Render to qt from agg
+"""
+
+from .. import cbook
+from .backend_qt5agg import (
+    _BackendQT5Agg, FigureCanvasQTAgg, FigureManagerQT, NavigationToolbar2QT)
+
+
+cbook.warn_deprecated("3.3", name=__name__, obj_type="backend")
+
+
+@_BackendQT5Agg.export
+class _BackendQT4Agg(_BackendQT5Agg):
+    class FigureCanvas(FigureCanvasQTAgg):
+        required_interactive_framework = "qt4"