Question

How to create a fixed size deque in Python

Answer 1

from collections import deque

dq = deque(maxlen=4)

dq.extend([8, 9, 12, 798])

print(dq) 

dq.append(1)

print(dq) 




'''
run:

deque([8, 9, 12, 798], maxlen=4)
deque([9, 12, 798, 1], maxlen=4)

'''

 

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Answer 2

from collections import deque

dq = deque(maxlen=4)

dq.extend([8, 9, 12, 798])

print(dq) 

dq.appendleft(1)

print(dq) 




'''
run:

deque([8, 9, 12, 798], maxlen=4)
deque([1, 8, 9, 12], maxlen=4)

'''

 

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