Deprecate lxml

Signed-off-by: Christian Heimes <christian@python.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/defusedxml/lxml.py b/defusedxml/lxml.py
index 3468824..f16256f 100644
--- a/defusedxml/lxml.py
+++ b/defusedxml/lxml.py
@@ -10,6 +10,8 @@ The code has NO protection against decompression bombs.
 from __future__ import print_function, absolute_import
 
 import threading
+import warnings
+
 from lxml import etree as _etree
 
 from .common import DTDForbidden, EntitiesForbidden, NotSupportedError
@@ -21,6 +23,13 @@ __origin__ = "lxml.etree"
 tostring = _etree.tostring
 
 
+warnings.warn(
+    "defusedxml.lxml is no longer supported and will be removed in a "
+    "future release.",
+    category=DeprecationWarning
+)
+
+
 class RestrictedElement(_etree.ElementBase):
     """A restricted Element class that filters out instances of some classes
     """