utils.py
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from ordered_set import OrderedSet
from typing import List
class LimitedOrderedSet(OrderedSet):
def __init__(self, limit=0, seq=()):
self.limit = 0
if isinstance(limit, List):
seq = limit
else:
self.limit = limit
super(LimitedOrderedSet, self).__init__(seq)
self._check_length()
def copy(self):
return LimitedOrderedSet(limit=self.limit, seq=self)
def discard(self, key):
self.items.remove(key)
self.map.pop(key)
def _check_length(self):
if not self.limit:
return
if len(self) > self.limit:
for v in self[0:-self.limit]:
self.remove(v)
def __getitem__(self, item):
res = super(LimitedOrderedSet, self).__getitem__(item)
if isinstance(res, OrderedSet):
return LimitedOrderedSet(self.limit, list(res))
else:
return res
def __getstate__(self):
return self.limit, list(self)
def __setstate__(self, state):
self.__init__(*state)
def add(self, key):
result = super(LimitedOrderedSet, self).add(key)
self._check_length()
return result
append = add