Slicable Deque

sliceable_deque.py

# From : https://stackoverflow.com/questions/10003143/how-to-slice-a-deque

class sliceable_deque(collections.deque):
    def __getitem__(self, index):
        try:
            return collections.deque.__getitem__(self, index)
        except TypeError:
            return type(self)(itertools.islice(self, index.start,
                                               index.stop, index.step))

We cannot do this:

import collections
import itertools

mydeque = collections.deque.deque()

for i in range(10):
  mydeque.append(0)

print(mydeque[:5])

because we get an error as in the link. Then now we can do this

mydeque = sliceable_deque()

for i in range(10):
  mydeque.append(0)

print(mydeque[:5])