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bindings/python: Implement Tags().__nonzero__()

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Analog to Threads.__nonzero__ this allows us to perform list() on a Threads() object and to repeatedly call "if Tags():" or "bool(Tags())" without implicitly invoking len(), thus exhausting our iterator.

While touching this code, I added a small micro-optimization to the Tag next() function. There is no need to explicitly check _is_valid, as _get implicitly does check for validness and returns None, if there is no more Tag to fetch. This avoids some roundtrips into the library when iterating through Tags.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
This commit is contained in:
Sebastian Spaeth 2011-06-02 17:28:50 +02:00
parent 01cc4a3115
commit aeecafa694
1 changed files with 15 additions and 4 deletions
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19
bindings/python/notmuch/tag.py
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@ -81,15 +81,26 @@ class Tags(object):
def next(self):
if self._tags is None:
raise NotmuchError(STATUS.NOT_INITIALIZED)
if not nmlib.notmuch_tags_valid(self._tags):
# No need to call nmlib.notmuch_tags_valid(self._tags);
# Tags._get safely returns None, if there is no more valid tag.
tag = Tags._get (self._tags)
if tag is None:
self._tags = None
raise StopIteration
tag = Tags._get (self._tags)
nmlib.notmuch_tags_move_to_next(self._tags)
return tag
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.
:returns: True if the Tags() iterator has at least one more Tag
left."""
return nmlib.notmuch_tags_valid(self._tags) > 0
def __len__(self):
"""len(:class:`Tags`) returns the number of contained tags