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queue_on_pseudo_stack.py

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"""Queue represented by a pseudo stack (represented by a list with pop and append)"""

class Queue:

def __init__(self):

self.stack = []

self.length = 0

def __str__(self):

printed = "<" + str(self.stack)[1:-1] + ">"

return printed

"""Enqueues {@code item}

@param item

item to enqueue"""

def put(self, item):

self.stack.append(item)

self.length = self.length + 1

"""Dequeues {@code item}

@requirement: |self.length| > 0

@return dequeued

item that was dequeued"""

def get(self):

self.rotate(1)

dequeued = self.stack[self.length - 1]

self.stack = self.stack[:-1]

self.rotate(self.length - 1)

self.length = self.length - 1

return dequeued

"""Rotates the queue {@code rotation} times

@param rotation

number of times to rotate queue"""

def rotate(self, rotation):

for i in range(rotation):

temp = self.stack[0]

self.stack = self.stack[1:]

self.put(temp)

self.length = self.length - 1

"""Reports item at the front of self

@return item at front of self.stack"""

def front(self):

front = self.get()

self.put(front)

self.rotate(self.length - 1)

return front

"""Returns the length of this.stack"""

def size(self):

return self.length