Create Deque.py

Author: Chandusomineni

Deque.py

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+import collections
+de = collections.deque([1, 2, 3])
+print("deque: ", de)
+de.append(4)
+print("\nThe deque after appending at right is : ")
+print(de)
+de.appendleft(6)
+print("\nThe deque after appending at left is : ")
+print(de)