reorganize dir

Signed-off-by: Mia Steinkirch <mia.steinkirch@gmail.com>

ebook_src/abstract_structures/queues/deque.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+
+__author__ = "bt3"
+
+''' a class for a double ended queue (also inefficient) '''
+
+from queue import Queue
+
+class Deque(Queue):
+
+    def enqueue_back(self, item):
+        self.items.append(item)
+
+    def dequeue_front(self):
+        return self.items.pop(0)
+
+
+
+if __name__ == '__main__':
+    queue = Deque()
+    print("Is the queue empty? ", queue.isEmpty())
+    print("Adding 0 to 10 in the queue...")
+    for i in range(10):
+        queue.enqueue(i)
+    print("Queue size: ", queue.size())
+    print("Queue peek : ", queue.peek())
+    print("Dequeue...", queue.dequeue())
+    print("Queue peek: ", queue.peek())
+    print("Is the queue empty? ", queue.isEmpty())
+    print(queue)
+
+    print("\nNow using the dequeue methods...")
+    print("Dequeue from front...", queue.dequeue_front())
+    print("Queue peek: ", queue.peek())
+    print(queue)
+    print("Queue from back...")
+    queue.enqueue_back(50)
+    print("Queue peek: ", queue.peek())
+    print(queue)