Python/data_structures/queue/double_ended_queue.py

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# Python code to demonstrate working of
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# extend(), extendleft(), rotate(), reverse()
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# importing "collections" for deque operations
import collections
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# initializing deque
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de = collections.deque([1, 2, 3])
# using extend() to add numbers to right end
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# adds 4,5,6 to right end
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de.extend([4, 5, 6])
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# printing modified deque
print("The deque after extending deque at end is : ")
print(de)
# using extendleft() to add numbers to left end
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# adds 7,8,9 to right end
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de.extendleft([7, 8, 9])
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# printing modified deque
print("The deque after extending deque at beginning is : ")
print(de)
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# using rotate() to rotate the deque
# rotates by 3 to left
de.rotate(-3)
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# printing modified deque
print("The deque after rotating deque is : ")
print(de)
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# using reverse() to reverse the deque
de.reverse()
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# 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)