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double_ended_queue.py

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# Python code to demonstrate working of

# extend(), extendleft(), rotate(), reverse()

# importing "collections" for deque operations

import collections

# initializing deque

de = collections.deque([1, 2, 3])

# using extend() to add numbers to right end

# adds 4,5,6 to right end

de.extend([4, 5, 6])

# printing modified deque

print("The deque after extending deque at end is : ")

print(de)

# using extendleft() to add numbers to left end

# adds 7,8,9 to right end

de.extendleft([7, 8, 9])

# printing modified deque

print("The deque after extending deque at beginning is : ")

print(de)

# using rotate() to rotate the deque

# rotates by 3 to left

de.rotate(-3)

# printing modified deque

print("The deque after rotating deque is : ")

print(de)

# using reverse() to reverse the deque

de.reverse()

# printing modified deque

print("The deque after reversing deque is : ")

print(de)

# get right-end value and eliminate

startValue = de.pop()

print("The deque after popping value at end is : ")

print(de)

# get left-end value and eliminate

endValue = de.popleft()

print("The deque after popping value at start is : ")

print(de)

# eliminate element searched by value

de.remove(5)

print("The deque after eliminating element searched by value : ")

print(de)