Deprecate support for Python 2 (#5251)

2 files changed, 16 insertions, 0 deletions

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 7dc2b992..d1715df3 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -14,6 +14,10 @@ Changelog
   as per our deprecation policy.
 * **BACKWARDS INCOMPATIBLE:** Support for LibreSSL 2.7.x, 2.8.x, and 2.9.0 has
   been removed (2.9.1+ is still supported).
+* Deprecated support for Python 2. At the time there is no time table for
+  actually dropping support, however we strongly encourage all users to upgrade
+  their Python, as Python 2 no longer receives support from the Python core
+  team.
 
 .. _v2-9-2:
 
diff --git a/src/cryptography/__init__.py b/src/cryptography/__init__.py
index 6da0b383..bd2a8102 100644
--- a/src/cryptography/__init__.py
+++ b/src/cryptography/__init__.py
@@ -4,13 +4,25 @@
 
 from __future__ import absolute_import, division, print_function
 
+import sys
+import warnings
+
 from cryptography.__about__ import (
     __author__, __copyright__, __email__, __license__, __summary__, __title__,
     __uri__, __version__
 )
+from cryptography.utils import CryptographyDeprecationWarning
 
 
 __all__ = [
     "__title__", "__summary__", "__uri__", "__version__", "__author__",
     "__email__", "__license__", "__copyright__",
 ]
+
+if sys.version_info[0] == 2:
+    warnings.warn(
+        "Python 2 is no longer supported by the Python core team. Support for "
+        "it is now deprecated in cryptography, and will be removed in a "
+        "future release.",
+        CryptographyDeprecationWarning
+    )