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File _weakrefset.py

# Access WeakSet through the weakref module.
# This code is separated-out because it is needed
# by abc.py to load everything else at startup.

from _weakref import ref
from types import GenericAlias

__all__ = ['WeakSet']

class _IterationGuard:
    # This context manager registers itself in the current iterators of the
    # weak container, such as to delay all removals until the context manager
    # exits.
    # This technique should be relatively thread-safe (since sets are).

def __init__(self, weakcontainer):
        # Don't create cycles
        self.weakcontainer = ref(weakcontainer)

def __enter__(self):
        w = self.weakcontainer()
        if w is not None:
            w._iterating.add(self)
        return self

def __exit__(self, e, t, b):
        w = self.weakcontainer()
        if w is not None:
            s = w._iterating
            s.remove(self)
            if not s:
                w._commit_removals()

class WeakSet:
    def __init__(self, data=None):
        self.data = set()
        def _remove(item, selfref=ref(self)):
            self = selfref()
            if self is not None:
                if self._iterating:
                    self._pending_removals.append(item)
                else:
                    self.data.discard(item)
        self._remove = _remove
        # A list of keys to be removed
        self._pending_removals = []
        self._iterating = set()
        if data is not None:
            self.update(data)

def _commit_removals(self):
        pop = self._pending_removals.pop
        discard = self.data.discard
        while True:
            try:
                item = pop()
            except IndexError:
                return
            discard(item)

def __iter__(self):
        with _IterationGuard(self):
            for itemref in self.data:
                item = itemref()
                if item is not None:
                    # Caveat: the iterator will keep a strong reference to
                    # `item` until it is resumed or closed.
                    yield item

def __len__(self):
        return len(self.data) - len(self._pending_removals)

def __contains__(self, item):
        try:
            wr = ref(item)
        except TypeError:
            return False
        return wr in self.data

def __reduce__(self):
        return self.__class__, (list(self),), self.__getstate__()

def add(self, item):
        if self._pending_removals:
            self._commit_removals()
        self.data.add(ref(item, self._remove))

def clear(self):
        if self._pending_removals:
            self._commit_removals()
        self.data.clear()

def copy(self):
        return self.__class__(self)

def pop(self):
        if self._pending_removals:
            self._commit_removals()
        while True:
            try:
                itemref = self.data.pop()
            except KeyError:
                raise KeyError('pop from empty WeakSet') from None
            item = itemref()
            if item is not None:
                return item

def remove(self, item):
        if self._pending_removals:
            self._commit_removals()
        self.data.remove(ref(item))

def discard(self, item):
        if self._pending_removals:
            self._commit_removals()
        self.data.discard(ref(item))

def update(self, other):
        if self._pending_removals:
            self._commit_removals()
        for element in other:
            self.add(element)

def __ior__(self, other):
        self.update(other)
        return self

def difference(self, other):
        newset = self.copy()
        newset.difference_update(other)
        return newset
    __sub__ = difference

def difference_update(self, other):
        self.__isub__(other)
    def __isub__(self, other):
        if self._pending_removals:
            self._commit_removals()
        if self is other:
            self.data.clear()
        else:
            self.data.difference_update(ref(item) for item in other)
        return self

def intersection(self, other):
        return self.__class__(item for item in other if item in self)
    __and__ = intersection

def intersection_update(self, other):
        self.__iand__(other)
    def __iand__(self, other):
        if self._pending_removals:
            self._commit_removals()
        self.data.intersection_update(ref(item) for item in other)
        return self

def issubset(self, other):
        return self.data.issubset(ref(item) for item in other)
    __le__ = issubset

def __lt__(self, other):
        return self.data < set(map(ref, other))

def issuperset(self, other):
        return self.data.issuperset(ref(item) for item in other)
    __ge__ = issuperset

def __gt__(self, other):
        return self.data > set(map(ref, other))

def __eq__(self, other):
        if not isinstance(other, self.__class__):
            return NotImplemented
        return self.data == set(map(ref, other))

def symmetric_difference(self, other):
        newset = self.copy()
        newset.symmetric_difference_update(other)
        return newset
    __xor__ = symmetric_difference

def symmetric_difference_update(self, other):
        self.__ixor__(other)
    def __ixor__(self, other):
        if self._pending_removals:
            self._commit_removals()
        if self is other:
            self.data.clear()
        else:
            self.data.symmetric_difference_update(ref(item, self._remove) for item in other)
        return self

def union(self, other):
        return self.__class__(e for s in (self, other) for e in s)
    __or__ = union

def isdisjoint(self, other):
        return len(self.intersection(other)) == 0

def __repr__(self):
        return repr(self.data)

__class_getitem__ = classmethod(GenericAlias)

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-08-04 10:57:25
..	DIR	-	drwxr-xr-x	2025-08-04 10:57:25
__pycache__	DIR	-	drwxr-xr-x	2025-08-04 10:57:25
asyncio	DIR	-	drwxr-xr-x	2025-08-04 10:57:25
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html	DIR	-	drwxr-xr-x	2025-08-04 10:57:25
http	DIR	-	drwxr-xr-x	2025-08-04 10:57:25
importlib	DIR	-	drwxr-xr-x	2025-08-04 10:57:25
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symtable.py	text/x-python	10.13 KB	-rw-r--r--	2025-06-03 06:38:25
sysconfig.py	text/x-python	29.6 KB	-rw-r--r--	2025-06-03 06:38:25
tabnanny.py	text/plain	11.05 KB	-rwxr-xr-x	2025-06-03 06:38:25
tarfile.py	text/plain	109.22 KB	-rwxr-xr-x	2025-06-03 06:38:25
telnetlib.py	text/x-python	22.75 KB	-rw-r--r--	2025-06-03 06:38:25
tempfile.py	text/x-python	31.13 KB	-rw-r--r--	2025-06-03 06:38:25
textwrap.py	text/plain	19.26 KB	-rw-r--r--	2025-06-03 06:38:25
this.py	text/plain	1003 B	-rw-r--r--	2025-06-03 06:38:25
threading.py	text/x-python	56.87 KB	-rw-r--r--	2025-06-03 06:38:25
timeit.py	text/plain	13.22 KB	-rwxr-xr-x	2025-06-03 06:38:25
token.py	text/plain	2.33 KB	-rw-r--r--	2025-06-03 06:38:25
tokenize.py	text/x-python	25.72 KB	-rw-r--r--	2025-06-03 06:38:25
trace.py	text/plain	28.52 KB	-rwxr-xr-x	2025-06-03 06:38:25
traceback.py	text/x-python	39.6 KB	-rw-r--r--	2025-06-03 06:38:25
tracemalloc.py	text/x-python	17.62 KB	-rw-r--r--	2025-06-03 06:38:25
tty.py	text/x-python	879 B	-rw-r--r--	2025-06-03 06:38:25
types.py	text/plain	9.83 KB	-rw-r--r--	2025-06-03 06:38:25
typing.py	text/x-python	118.12 KB	-rw-r--r--	2025-06-03 06:38:25
uu.py	text/x-python	7.17 KB	-rw-r--r--	2025-07-23 10:03:41
uuid.py	text/x-python	26.95 KB	-rw-r--r--	2025-06-03 06:38:25
warnings.py	text/plain	20.62 KB	-rw-r--r--	2025-06-03 06:38:25
wave.py	text/x-python	21.31 KB	-rw-r--r--	2025-06-03 06:38:25
weakref.py	text/x-python	21.01 KB	-rw-r--r--	2025-06-03 06:38:25
webbrowser.py	text/plain	24.57 KB	-rwxr-xr-x	2025-06-03 06:38:25
xdrlib.py	text/x-python	5.84 KB	-rw-r--r--	2025-06-03 06:38:25
zipapp.py	text/x-python	7.36 KB	-rw-r--r--	2025-06-03 06:38:25
zipfile.py	text/plain	91.59 KB	-rw-r--r--	2025-06-03 06:38:25
zipimport.py	text/x-python	30.17 KB	-rw-r--r--	2025-06-03 06:38:25

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