accept the fact that nothing can be taken for granted

pyca · Dec 21, 2020 · 25ac2b6 · 25ac2b6
1 parent 740a1cf
commit 25ac2b6
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/OpenSSL/SSL.py b/src/OpenSSL/SSL.py
@@ -156,7 +156,10 @@ class _buffer(object):
 TLS1_VERSION = _lib.TLS1_VERSION
 TLS1_1_VERSION = _lib.TLS1_1_VERSION
 TLS1_2_VERSION = _lib.TLS1_2_VERSION
-TLS1_3_VERSION = _lib.TLS1_3_VERSION
+try:
+    TLS1_3_VERSION = _lib.TLS1_3_VERSION
+except AttributeError:
+    pass
 
 OP_NO_SSLv2 = _lib.SSL_OP_NO_SSLv2
 OP_NO_SSLv3 = _lib.SSL_OP_NO_SSLv3