python: Only use features found in Debian Stable (Debian 9)

  - CDefError is not exposed as cffi.error.CDefError, but as
    cffi.api.CDefError in python3-cffi 1.9.1-2.  This change is
    forwards compatible with python3-cffi 1.11.5-3 (from Debian
    Testing).

  - enum.auto is only available in Python v3.6.  Albeit uglier,
    manually assigning values works in Python v3.5 (and later).

1 files changed, 8 insertions, 5 deletions

diff --git a/ffi/lang/python/tests/test_packet_parser.py b/ffi/lang/python/tests/test_packet_parser.py
index 1c134f6f..de126bc3 100644
--- a/ffi/lang/python/tests/test_packet_parser.py
+++ b/ffi/lang/python/tests/test_packet_parser.py
@@ -1,4 +1,4 @@
-from enum import Enum, auto
+from enum import Enum
 from sequoia.core import Context, NetworkPolicy
 from sequoia.openpgp import Tag, PacketParser
 
@@ -11,10 +11,13 @@ def test_decryption():
                   ephemeral=True)
 
     class State(Enum):
-        Start = auto()
-        Decrypted = auto()
-        Deciphered = auto()
-        Done = auto()
+        # XXX: In Python 3.6, we can use enum.auto() to assign values.
+        # But we want to support Debian 9, which uses Python 3.5, as
+        # long as it is Debian stable.
+        Start = 1
+        Decrypted = 2
+        Deciphered = 3
+        Done = 4
 
     state = State.Start
     algo, key = None, None