data_structures/queue/linked_queue.py · wanghaikuo/Python

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Python

data_structures

queue

linked_queue.py

linked_queue.py 3.59 KB

""" A Queue using a linked list like structure """
from __future__ import annotations

from typing import Any, Iterator

class Node:
 def __init__(self, data: Any) -> None:
 self.data: Any = data
 self.next: Node | None = None

def __str__(self) -> str:
 return f"{self.data}"

class LinkedQueue:
 """
 >>> queue = LinkedQueue()
 >>> queue.is_empty()
 True
 >>> queue.put(5)
 >>> queue.put(9)
 >>> queue.put('python')
 >>> queue.is_empty();
 False
 >>> queue.get()
 5
 >>> queue.put('algorithms')
 >>> queue.get()
 9
 >>> queue.get()
 'python'
 >>> queue.get()
 'algorithms'
 >>> queue.is_empty()
 True
 >>> queue.get()
 Traceback (most recent call last):
 ...
 IndexError: dequeue from empty queue
 """

def __init__(self) -> None:
 self.front: Node | None = None
 self.rear: Node | None = None

def __iter__(self) -> Iterator[Any]:
 node = self.front
 while node:
 yield node.data
 node = node.next

def __len__(self) -> int:
 """
 >>> queue = LinkedQueue()
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> len(queue)
 5
 >>> for i in range(1, 6):
 ... assert len(queue) == 6 - i
 ... _ = queue.get()
 >>> len(queue)
 0
 """
 return len(tuple(iter(self)))

def __str__(self) -> str:
 """
 >>> queue = LinkedQueue()
 >>> for i in range(1, 4):
 ... queue.put(i)
 >>> queue.put("Python")
 >>> queue.put(3.14)
 >>> queue.put(True)
 >>> str(queue)
 '1 <- 2 <- 3 <- Python <- 3.14 <- True'
 """
 return " <- ".join(str(item) for item in self)

def is_empty(self) -> bool:
 """
 >>> queue = LinkedQueue()
 >>> queue.is_empty()
 True
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> queue.is_empty()
 False
 """
 return len(self) == 0

def put(self, item: Any) -> None:
 """
 >>> queue = LinkedQueue()
 >>> queue.get()
 Traceback (most recent call last):
 ...
 IndexError: dequeue from empty queue
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> str(queue)
 '1 <- 2 <- 3 <- 4 <- 5'
 """
 node = Node(item)
 if self.is_empty():
 self.front = self.rear = node
 else:
 assert isinstance(self.rear, Node)
 self.rear.next = node
 self.rear = node

def get(self) -> Any:
 """
 >>> queue = LinkedQueue()
 >>> queue.get()
 Traceback (most recent call last):
 ...
 IndexError: dequeue from empty queue
 >>> queue = LinkedQueue()
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> for i in range(1, 6):
 ... assert queue.get() == i
 >>> len(queue)
 0
 """
 if self.is_empty():
 raise IndexError("dequeue from empty queue")
 assert isinstance(self.front, Node)
 node = self.front
 self.front = self.front.next
 if self.front is None:
 self.rear = None
 return node.data

def clear(self) -> None:
 """
 >>> queue = LinkedQueue()
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> queue.clear()
 >>> len(queue)
 0
 >>> str(queue)
 ''
 """
 self.front = self.rear = None

if __name__ == "__main__":
 from doctest import testmod

testmod()

一键复制编辑原始数据按行查看历史

Dylan Buchi 提交于 2021年10月23日 17:56 +08:00 . [mypy] Add type annotations for linked queue in data structures (#5533)

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""" A Queue using a linked list like structure """
from __future__ import annotations

from typing import Any, Iterator


class Node:
 def __init__(self, data: Any) -> None:
 self.data: Any = data
 self.next: Node | None = None

 def __str__(self) -> str:
 return f"{self.data}"


class LinkedQueue:
 """
 >>> queue = LinkedQueue()
 >>> queue.is_empty()
 True
 >>> queue.put(5)
 >>> queue.put(9)
 >>> queue.put('python')
 >>> queue.is_empty();
 False
 >>> queue.get()
 5
 >>> queue.put('algorithms')
 >>> queue.get()
 9
 >>> queue.get()
 'python'
 >>> queue.get()
 'algorithms'
 >>> queue.is_empty()
 True
 >>> queue.get()
 Traceback (most recent call last):
 ...
 IndexError: dequeue from empty queue
 """

 def __init__(self) -> None:
 self.front: Node | None = None
 self.rear: Node | None = None

 def __iter__(self) -> Iterator[Any]:
 node = self.front
 while node:
 yield node.data
 node = node.next

 def __len__(self) -> int:
 """
 >>> queue = LinkedQueue()
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> len(queue)
 5
 >>> for i in range(1, 6):
 ... assert len(queue) == 6 - i
 ... _ = queue.get()
 >>> len(queue)
 0
 """
 return len(tuple(iter(self)))

 def __str__(self) -> str:
 """
 >>> queue = LinkedQueue()
 >>> for i in range(1, 4):
 ... queue.put(i)
 >>> queue.put("Python")
 >>> queue.put(3.14)
 >>> queue.put(True)
 >>> str(queue)
 '1 <- 2 <- 3 <- Python <- 3.14 <- True'
 """
 return " <- ".join(str(item) for item in self)

 def is_empty(self) -> bool:
 """
 >>> queue = LinkedQueue()
 >>> queue.is_empty()
 True
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> queue.is_empty()
 False
 """
 return len(self) == 0

 def put(self, item: Any) -> None:
 """
 >>> queue = LinkedQueue()
 >>> queue.get()
 Traceback (most recent call last):
 ...
 IndexError: dequeue from empty queue
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> str(queue)
 '1 <- 2 <- 3 <- 4 <- 5'
 """
 node = Node(item)
 if self.is_empty():
 self.front = self.rear = node
 else:
 assert isinstance(self.rear, Node)
 self.rear.next = node
 self.rear = node

 def get(self) -> Any:
 """
 >>> queue = LinkedQueue()
 >>> queue.get()
 Traceback (most recent call last):
 ...
 IndexError: dequeue from empty queue
 >>> queue = LinkedQueue()
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> for i in range(1, 6):
 ... assert queue.get() == i
 >>> len(queue)
 0
 """
 if self.is_empty():
 raise IndexError("dequeue from empty queue")
 assert isinstance(self.front, Node)
 node = self.front
 self.front = self.front.next
 if self.front is None:
 self.rear = None
 return node.data

 def clear(self) -> None:
 """
 >>> queue = LinkedQueue()
 >>> for i in range(1, 6):
 ... queue.put(i)
 >>> queue.clear()
 >>> len(queue)
 0
 >>> str(queue)
 ''
 """
 self.front = self.rear = None


if __name__ == "__main__":
 from doctest import testmod

 testmod()