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<h1>
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<doc-anchor-trigger class="header-anchor-trigger" to="#collections">#</doc-anchor-trigger>
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<span>collections</span>
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<h3>
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<doc-anchor-trigger class="header-anchor-trigger" to="#collectionscounteriterable">#</doc-anchor-trigger>
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<span><code v-pre>collections.Counter(iterable)</code></span>
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</h3>
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</doc-anchor-target>
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<p>Return a <code v-pre>dict</code> containing the counts of each element in <code v-pre>iterable</code>.</p>
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<h3>
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<doc-anchor-trigger class="header-anchor-trigger" to="#collectionsdeque">#</doc-anchor-trigger>
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<span><code v-pre>collections.deque</code></span>
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</h3>
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</doc-anchor-target>
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<p>A double-ended queue.</p>
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<doc-anchor-target id="collectionsdefaultdict">
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<h3>
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<doc-anchor-trigger class="header-anchor-trigger" to="#collectionsdefaultdict">#</doc-anchor-trigger>
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<span><code v-pre>collections.defaultdict</code></span>
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</h3>
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</doc-anchor-target>
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<p>A dictionary that returns a default value when a key is not found.</p>
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<doc-anchor-target id="source-code">
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<h4>
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<doc-anchor-trigger class="header-anchor-trigger" to="#source-code">#</doc-anchor-trigger>
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<span>Source code</span>
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</h4>
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</doc-anchor-target>
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<div class="codeblock-wrapper"><doc-codeblock>
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|
<pre translate="no" class="language-python"><code v-pre class="language-python">from typing import TypeVar, Iterable
|
|
|
|
def Counter[T](iterable: Iterable[T]):
|
|
a: dict[T, int] = {}
|
|
for x in iterable:
|
|
if x in a:
|
|
a[x] += 1
|
|
else:
|
|
a[x] = 1
|
|
return a
|
|
|
|
|
|
class defaultdict(dict):
|
|
def __init__(self, default_factory, *args):
|
|
super().__init__(*args)
|
|
self.default_factory = default_factory
|
|
|
|
def __missing__(self, key):
|
|
self[key] = self.default_factory()
|
|
return self[key]
|
|
|
|
def __repr__(self) -> str:
|
|
return f"defaultdict({self.default_factory}, {super().__repr__()})"
|
|
|
|
def copy(self):
|
|
return defaultdict(self.default_factory, self)
|
|
|
|
|
|
class deque[T]:
|
|
_head: int
|
|
_tail: int
|
|
_maxlen: int | None
|
|
_capacity: int
|
|
_data: list[T]
|
|
|
|
def __init__(self, iterable: Iterable[T] = None, maxlen: int | None = None):
|
|
if maxlen is not None:
|
|
assert maxlen > 0
|
|
|
|
self._head = 0
|
|
self._tail = 0
|
|
self._maxlen = maxlen
|
|
self._capacity = 8 if maxlen is None else maxlen + 1
|
|
self._data = [None] * self._capacity # type: ignore
|
|
|
|
if iterable is not None:
|
|
self.extend(iterable)
|
|
|
|
@property
|
|
def maxlen(self) -> int | None:
|
|
return self._maxlen
|
|
|
|
def __resize_2x(self):
|
|
backup = list(self)
|
|
self._capacity *= 2
|
|
self._head = 0
|
|
self._tail = len(backup)
|
|
self._data.clear()
|
|
self._data.extend(backup)
|
|
self._data.extend([None] * (self._capacity - len(backup)))
|
|
|
|
def append(self, x: T):
|
|
if (self._tail + 1) % self._capacity == self._head:
|
|
if self._maxlen is None:
|
|
self.__resize_2x()
|
|
else:
|
|
self.popleft()
|
|
self._data[self._tail] = x
|
|
self._tail = (self._tail + 1) % self._capacity
|
|
|
|
def appendleft(self, x: T):
|
|
if (self._tail + 1) % self._capacity == self._head:
|
|
if self._maxlen is None:
|
|
self.__resize_2x()
|
|
else:
|
|
self.pop()
|
|
self._head = (self._head - 1) % self._capacity
|
|
self._data[self._head] = x
|
|
|
|
def copy(self):
|
|
return deque(self, maxlen=self.maxlen)
|
|
|
|
def count(self, x: T) -> int:
|
|
n = 0
|
|
for item in self:
|
|
if item == x:
|
|
n += 1
|
|
return n
|
|
|
|
def extend(self, iterable: Iterable[T]):
|
|
for x in iterable:
|
|
self.append(x)
|
|
|
|
def extendleft(self, iterable: Iterable[T]):
|
|
for x in iterable:
|
|
self.appendleft(x)
|
|
|
|
def pop(self) -> T:
|
|
if self._head == self._tail:
|
|
raise IndexError("pop from an empty deque")
|
|
self._tail = (self._tail - 1) % self._capacity
|
|
x = self._data[self._tail]
|
|
self._data[self._tail] = None
|
|
return x
|
|
|
|
def popleft(self) -> T:
|
|
if self._head == self._tail:
|
|
raise IndexError("pop from an empty deque")
|
|
x = self._data[self._head]
|
|
self._data[self._head] = None
|
|
self._head = (self._head + 1) % self._capacity
|
|
return x
|
|
|
|
def clear(self):
|
|
i = self._head
|
|
while i != self._tail:
|
|
self._data[i] = None # type: ignore
|
|
i = (i + 1) % self._capacity
|
|
self._head = 0
|
|
self._tail = 0
|
|
|
|
def rotate(self, n: int = 1):
|
|
if len(self) == 0:
|
|
return
|
|
if n > 0:
|
|
n = n % len(self)
|
|
for _ in range(n):
|
|
self.appendleft(self.pop())
|
|
elif n < 0:
|
|
n = -n % len(self)
|
|
for _ in range(n):
|
|
self.append(self.popleft())
|
|
|
|
def __len__(self) -> int:
|
|
return (self._tail - self._head) % self._capacity
|
|
|
|
def __contains__(self, x: object) -> bool:
|
|
for item in self:
|
|
if item == x:
|
|
return True
|
|
return False
|
|
|
|
def __iter__(self):
|
|
i = self._head
|
|
while i != self._tail:
|
|
yield self._data[i]
|
|
i = (i + 1) % self._capacity
|
|
|
|
def __eq__(self, other: object) -> bool:
|
|
if not isinstance(other, deque):
|
|
return NotImplemented
|
|
if len(self) != len(other):
|
|
return False
|
|
for x, y in zip(self, other):
|
|
if x != y:
|
|
return False
|
|
return True
|
|
|
|
def __ne__(self, other: object) -> bool:
|
|
if not isinstance(other, deque):
|
|
return NotImplemented
|
|
return not self == other
|
|
|
|
def __repr__(self) -> str:
|
|
if self.maxlen is None:
|
|
return f"deque({list(self)!r})"
|
|
return f"deque({list(self)!r}, maxlen={self.maxlen})"
|
|
</code></pre>
|
|
</doc-codeblock></div>
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<div class="w-40 h-3 mb-4 bg-skeleton-bg rounded-full loading"></div>
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</div>
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</div>
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<!-- User should be able to hide sidebar right -->
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<doc-sidebar-right v-cloak></doc-sidebar-right>
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</div>
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</div>
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</div>
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<doc-search-mobile></doc-search-mobile>
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<doc-back-to-top></doc-back-to-top>
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</div>
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<div id="retype-overlay-target"></div>
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<script data-cfasync="false">window.__DOCS__ = { "title": "collections", level: 2, icon: "file", hasPrism: true, hasMermaid: false, hasMath: false, tocDepth: 23 }</script>
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</body>
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</html>
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