mirror of
https://github.com/pocketpy/pocketpy
synced 2025-10-20 11:30:18 +00:00
87 lines
2.3 KiB
Python
87 lines
2.3 KiB
Python
class _LinkedListNode:
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def __init__(self, prev, next, value) -> None:
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self.prev = prev
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self.next = next
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self.value = value
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class deque:
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def __init__(self, iterable=None) -> None:
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self.head = _LinkedListNode(None, None, None)
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self.tail = _LinkedListNode(None, None, None)
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self.head.next = self.tail
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self.tail.prev = self.head
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self.size = 0
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if iterable is not None:
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for value in iterable:
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self.append(value)
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def append(self, value):
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node = _LinkedListNode(self.tail.prev, self.tail, value)
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self.tail.prev.next = node
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self.tail.prev = node
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self.size += 1
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def appendleft(self, value):
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node = _LinkedListNode(self.head, self.head.next, value)
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self.head.next.prev = node
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self.head.next = node
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self.size += 1
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def pop(self):
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assert self.size > 0
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node = self.tail.prev
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node.prev.next = self.tail
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self.tail.prev = node.prev
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self.size -= 1
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return node.value
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def popleft(self):
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assert self.size > 0
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node = self.head.next
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node.next.prev = self.head
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self.head.next = node.next
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self.size -= 1
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return node.value
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def copy(self):
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new_list = deque()
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for value in self:
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new_list.append(value)
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return new_list
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def __len__(self):
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return self.size
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def __iter__(self):
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node = self.head.next
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while node is not self.tail:
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yield node.value
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node = node.next
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def __repr__(self) -> str:
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return f"deque({list(self)})"
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def __eq__(self, __o: object) -> bool:
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if not isinstance(__o, deque):
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return False
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if len(self) != len(__o):
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return False
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t1, t2 = self.head.next, __o.head.next
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while t1 is not self.tail:
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if t1.value != t2.value:
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return False
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t1, t2 = t1.next, t2.next
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return True
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def __ne__(self, __o: object) -> bool:
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return not self == __o
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def Counter(iterable):
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a = {}
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for x in iterable:
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if x in a:
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a[x] += 1
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else:
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a[x] = 1
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return a |