本文整理汇总了Python中sortedcontainers.SortedDict.islice方法的典型用法代码示例。如果您正苦于以下问题：Python SortedDict.islice方法的具体用法？Python SortedDict.islice怎么用？Python SortedDict.islice使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类sortedcontainers.SortedDict的用法示例。
在下文中一共展示了SortedDict.islice方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: test_islice
# 需要导入模块: from sortedcontainers import SortedDict [as 别名]
# 或者: from sortedcontainers.SortedDict import islice [as 别名]
def test_islice():
mapping = [(val, pos) for pos, val in enumerate(string.ascii_lowercase)]
temp = SortedDict(7, mapping)
for start in range(30):
for stop in range(30):
assert list(temp.islice(start, stop)) == list(string.ascii_lowercase[start:stop])示例2: StreamChangeCache
# 需要导入模块: from sortedcontainers import SortedDict [as 别名]
# 或者: from sortedcontainers.SortedDict import islice [as 别名]
class StreamChangeCache(object):
"""Keeps track of the stream positions of the latest change in a set of entities.
Typically the entity will be a room or user id.
Given a list of entities and a stream position, it will give a subset of
entities that may have changed since that position. If position key is too
old then the cache will simply return all given entities.
"""
def __init__(self, name, current_stream_pos, max_size=10000, prefilled_cache=None):
self._max_size = int(max_size * caches.CACHE_SIZE_FACTOR)
self._entity_to_key = {}
self._cache = SortedDict()
self._earliest_known_stream_pos = current_stream_pos
self.name = name
self.metrics = caches.register_cache("cache", self.name, self._cache)
if prefilled_cache:
for entity, stream_pos in prefilled_cache.items():
self.entity_has_changed(entity, stream_pos)
def has_entity_changed(self, entity, stream_pos):
"""Returns True if the entity may have been updated since stream_pos
"""
assert type(stream_pos) in integer_types
if stream_pos < self._earliest_known_stream_pos:
self.metrics.inc_misses()
return True
latest_entity_change_pos = self._entity_to_key.get(entity, None)
if latest_entity_change_pos is None:
self.metrics.inc_hits()
return False
if stream_pos < latest_entity_change_pos:
self.metrics.inc_misses()
return True
self.metrics.inc_hits()
return False
def get_entities_changed(self, entities, stream_pos):
"""
Returns subset of entities that have had new things since the given
position. Entities unknown to the cache will be returned. If the
position is too old it will just return the given list.
"""
assert type(stream_pos) is int
if stream_pos >= self._earliest_known_stream_pos:
changed_entities = {
self._cache[k] for k in self._cache.islice(
start=self._cache.bisect_right(stream_pos),
)
}
result = changed_entities.intersection(entities)
self.metrics.inc_hits()
else:
result = set(entities)
self.metrics.inc_misses()
return result
def has_any_entity_changed(self, stream_pos):
"""Returns if any entity has changed
"""
assert type(stream_pos) is int
if not self._cache:
# If we have no cache, nothing can have changed.
return False
if stream_pos >= self._earliest_known_stream_pos:
self.metrics.inc_hits()
return self._cache.bisect_right(stream_pos) < len(self._cache)
else:
self.metrics.inc_misses()
return True
def get_all_entities_changed(self, stream_pos):
"""Returns all entites that have had new things since the given
position. If the position is too old it will return None.
"""
assert type(stream_pos) is int
if stream_pos >= self._earliest_known_stream_pos:
return [self._cache[k] for k in self._cache.islice(
start=self._cache.bisect_right(stream_pos))]
else:
return None
def entity_has_changed(self, entity, stream_pos):
"""Informs the cache that the entity has been changed at the given
position.
"""
assert type(stream_pos) is int
#.........这里部分代码省略.........