python: Don't call __del__ from __exit__ method.

* lang/python/src/core.py (Context, Data): Don't call __del__
from __exit__ method, as the object may be still in use.
* lang/python/tests/t-idiomatic.py: Fix the test.

--

GnuPG-bug-id: 6060
Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

lang/python/src/core.py

@@ -1190,7 +1190,7 @@ class Context(GpgmeWrapper):
         return self
 
     def __exit__(self, type, value, tb):
-        self.__del__()
+        return False
 
     def op_keylist_all(self, *args, **kwargs):
         self.op_keylist_start(*args, **kwargs)
@@ -1528,7 +1528,7 @@ class Data(GpgmeWrapper):
         return self
 
     def __exit__(self, type, value, tb):
-        self.__del__()
+        return False
 
     def _free_datacbs(self):
         self._data_cbs = None

lang/python/tests/t-idiomatic.py

@@ -35,6 +35,9 @@ with gpg.Context() as c, gpg.Data() as d:
     d.write(b"Halloechen")
     leak_c = c
     leak_d = d
+
+leak_c.__del__()
+leak_d.__del__()
 assert leak_c.wrapped is None
 assert leak_d.wrapped is None