matplotlib
diff --git a/‎lib/matplotlib/__init__.py
Copy file name to clipboardExpand all lines: lib/matplotlib/__init__.py
+3-1Lines changed: 3 additions & 1 deletion b/‎lib/matplotlib/__init__.py
Copy file name to clipboardExpand all lines: lib/matplotlib/__init__.py
+3-1Lines changed: 3 additions & 1 deletion
diff --git a/‎lib/matplotlib/rcsetup.py
Copy file name to clipboardExpand all lines: lib/matplotlib/rcsetup.py
+14-2Lines changed: 14 additions & 2 deletions b/‎lib/matplotlib/rcsetup.py
Copy file name to clipboardExpand all lines: lib/matplotlib/rcsetup.py
+14-2Lines changed: 14 additions & 2 deletions
@@ -847,11 +847,13 @@ def gen_candidates():
 
 _obsolete_set = {'text.dvipnghack'}
 
+_other_deprecated = {'backend.qt4', 'backend.qt5'}
+
 # The following may use a value of None to suppress the warning.
 _deprecated_set = {'axes.hold'}  # do NOT include in _all_deprecated
 
 _all_deprecated = set(itertools.chain(
-    _deprecated_ignore_map, _deprecated_map, _obsolete_set))
+    _deprecated_ignore_map, _deprecated_map, _obsolete_set, _other_deprecated))
 
 
 class RcParams(MutableMapping, dict):
 
@@ -266,8 +266,20 @@ def validate_backend(s):
         return _validate_standard_backends(s)
 
 
-validate_qt4 = ValidateInStrings('backend.qt4', ['PyQt4', 'PySide', 'PyQt4v2'])
-validate_qt5 = ValidateInStrings('backend.qt5', ['PyQt5', 'PySide2'])
+@deprecated("2.2",
+            "The backend.qt4 rcParam was deprecated in version 2.2.  In order "
+            "to force the use of a specific Qt4 binding, either import that "
+            "binding first, or set the QT_API environment variable.")
+def validate_qt4(s):
+    return s in ['PyQt4', 'PySide', 'PyQt4v2']
+
+
+@deprecated("2.2",
+            "The backend.qt5 rcParam was deprecated in version 2.2.  In order "
+            "to force the use of a specific Qt5 binding, either import that "
+            "binding first, or set the QT_API environment variable.")
+def validate_qt5(s):
+    return s in ['PyQt5', 'PySide2']
 
 
 def validate_toolbar(s):