python: Drop superfluous imports and trim public interface.

* lang/python/pyme/__init__.py: Avoid leaking low-level 'gpgme', make
sure the main module looks nice and tidy, appease pyflakes.
* lang/python/pyme/errors.py: Appease pyflakes.
* lang/python/pyme/util.py: Avoid leaking low-level 'gpgme' into the
module namespace.
* lang/python/pyme/version.py.in: Likewise.
* lang/python/tests/t-keylist.py: Drop superfluous imports.
* lang/python/tests/t-sig-notation.py: Likewise.
* lang/python/tests/t-sign.py: Likewise.
* lang/python/tests/t-signers.py: Likewise.

Signed-off-by: Justus Winter <justus@g10code.com>

lang/python/pyme/__init__.py

@@ -99,7 +99,24 @@ GPGME documentation: https://www.gnupg.org/documentation/manuals/gpgme/
 
 """
 
-__all__ = ['core', 'errors', 'constants', 'util', 'callbacks', 'version']
-
+from . import core
+from . import errors
+from . import constants
+from . import util
+from . import callbacks
+from . import version
 from .core import Context
 from .core import Data
+
+# Interface hygiene.
+
+# Drop the low-level gpgme that creeps in for some reason.
+gpgme = None
+del gpgme
+
+# This is a white-list of symbols.  Any other will alert pyflakes.
+_ = [Context, Data, core, errors, constants, util, callbacks, version]
+del _
+
+__all__ = ["Context", "Data",
+           "core", "errors", "constants", "util", "callbacks", "version"]

lang/python/pyme/errors.py

@@ -20,6 +20,9 @@ from . import util
 
 util.process_constants('GPG_ERR_', globals())
 
+# To appease static analysis tools, we define some constants here:
+NO_ERROR = 0
+
 class PymeError(Exception):
     pass
 

lang/python/pyme/util.py

@@ -16,8 +16,6 @@
 #    License along with this library; if not, write to the Free Software
 #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
 
-from . import gpgme
-
 def process_constants(prefix, scope):
     """Called by the constant modules to load up the constants from the C
     library starting with PREFIX.  Matching constants will be inserted
@@ -25,6 +23,7 @@ def process_constants(prefix, scope):
     of inserted constants.
 
     """
+    from . import gpgme
     index = len(prefix)
     constants = {identifier[index:]: getattr(gpgme, identifier)
                  for identifier in dir(gpgme)

lang/python/pyme/version.py.in

@@ -59,3 +59,6 @@ Lesser General Public License for more details.
 You should have received a copy of the GNU Lesser General Public
 License along with this library; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA"""
+
+# Interface hygiene.  Keep this at the end.
+del gpgme

lang/python/tests/t-keylist.py

@@ -17,8 +17,6 @@
 # You should have received a copy of the GNU Lesser General Public
 # License along with this program; if not, see <http://www.gnu.org/licenses/>.
 
-import sys
-import pyme
 from pyme import core, constants
 import support
 

lang/python/tests/t-sig-notation.py

@@ -18,7 +18,7 @@
 # License along with this program; if not, see <http://www.gnu.org/licenses/>.
 
 import os
-from pyme import core, constants, errors
+from pyme import core, constants
 import support
 
 expected_notations = {

lang/python/tests/t-sign.py

@@ -17,7 +17,6 @@
 # You should have received a copy of the GNU Lesser General Public
 # License along with this program; if not, see <http://www.gnu.org/licenses/>.
 
-import sys
 import os
 import pyme
 from pyme import core, constants

lang/python/tests/t-signers.py

@@ -17,7 +17,6 @@
 # You should have received a copy of the GNU Lesser General Public
 # License along with this program; if not, see <http://www.gnu.org/licenses/>.
 
-import sys
 import pyme
 from pyme import core, constants
 import support