X-Git-Url: https://git.notmuchmail.org/git?a=blobdiff_plain;f=bindings%2Fpython%2Fnotmuch%2Ftag.py;h=1d52345794fcfef072d572ae04cfd37fa05dcab5;hb=294f956d860872f8aab970b7785d5752be5d8421;hp=526e51cd3c2697af207d5ff1c7b5ec293cd5b85d;hpb=a1442952d4d7fad8b7612502802ee346ac8fd349;p=notmuch

diff --git a/bindings/python/notmuch/tag.py b/bindings/python/notmuch/tag.py
index 526e51cd..1d523457 100644
--- a/bindings/python/notmuch/tag.py
+++ b/bindings/python/notmuch/tag.py
@@ -14,15 +14,17 @@ for more details.
 You should have received a copy of the GNU General Public License
 along with notmuch.  If not, see <http://www.gnu.org/licenses/>.
 
-Copyright 2010 Sebastian Spaeth <Sebastian@SSpaeth.de>'
+Copyright 2010 Sebastian Spaeth <Sebastian@SSpaeth.de>
 """
 from ctypes import c_char_p
-from notmuch.globals import (
+from .globals import (
     nmlib,
     Python3StringMixIn,
+    NotmuchTagsP,
+)
+from .errors import (
     NullPointerError,
     NotInitializedError,
-    NotmuchTagsP,
 )
 
 
@@ -107,15 +109,15 @@ class Tags(Python3StringMixIn):
     next = __next__ # python2.x iterator protocol compatibility
 
     def __nonzero__(self):
-        """Implement bool(Tags) check that can be repeatedly used
-
-        If __nonzero__ is not implemented, "if Tags()"
-        will implicitly call __len__, using up our iterator, so it is
-        important that this function is defined.
+        '''
+        Implement truth value testing. If __nonzero__ is not
+        implemented, the python runtime would fall back to `len(..) >
+        0` thus exhausting the iterator.
 
-        :returns: True if the Tags() iterator has at least one more Tag
-            left."""
-        return self._valid(self._tags) > 0
+        :returns: True if the wrapped iterator has at least one more object
+                  left.
+        '''
+        return self._tags and self._valid(self._tags)
 
     def __unicode__(self):
         """string representation of :class:`Tags`: a space separated list of tags
@@ -135,5 +137,5 @@ class Tags(Python3StringMixIn):
 
     def __del__(self):
         """Close and free the notmuch tags"""
-        if self._tags is not None:
+        if self._tags:
             self._destroy(self._tags)