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bindings/python: implement Threads().__nonzero__

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__nonzero__ checks if Threads() contains at least one more valid thread

 The existence of this function makes 'if Threads(): foo' work, as that
 previously implicitely called len() exhausting the iterator. This
 function makes `bool(Threads())` work repeatedly.

For further info, see http://docs.python.org/reference/datamodel.html.
Credits for the hint go to Brian May.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
This commit is contained in:
Sebastian Spaeth 2011-06-02 16:28:00 +02:00
parent 4d406d9c25
commit 01cc4a3115
1 changed files with 12 additions and 0 deletions
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12
bindings/python/notmuch/thread.py
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@ -141,7 +141,19 @@ class Threads(object):
self._threads = None
return i
def __nonzero__(self):
"""Check if :class:`Threads` contains at least one more valid thread
The existence of this function makes 'if Threads: foo' work, as
that will implicitely call len() exhausting the iterator if
__nonzero__ does not exist. This function makes `bool(Threads())`
work repeatedly.
:return: True if there is at least one more thread in the
Iterator, False if not. None on a "Out-of-memory" error.
"""
return self._threads is not None and \
nmlib.notmuch_threads_valid(self._threads) > 0
def __del__(self):
"""Close and free the notmuch Threads"""