Colon Operator with Deques (in Python)
Question:
I was hoping to use the colon operator with my deque but it didn’t seem to work the same as a list.
I was trying something like:
myDeque = deque([0,1,2,3,4,5])
myDequeFunction(myDeque[3:])
This is the error I recieved:
“TypeError: sequence index must be integer, not ‘slice'”
What is the best way to do array slicing with deques?
Answers:
deque objects don’t support slicing themselves, but you can make a new deque:
sliced_deque = deque(list(old_deque)[3:])
collections.deque objects don’t support slicing. It’d be more straightforward to make a new one.
n_deque = deque(list(d)[3:])
Iterating is probably faster than brute-force methods (note: unproven) due to the nature of a deque.
>>> myDeque = collections.deque([0,1,2,3,4,5])
>>> list(itertools.islice(myDeque, 3, sys.maxint))
[3, 4, 5]
I was hoping to use the colon operator with my deque but it didn’t seem to work the same as a list.
I was trying something like:
myDeque = deque([0,1,2,3,4,5])
myDequeFunction(myDeque[3:])
This is the error I recieved:
“TypeError: sequence index must be integer, not ‘slice'”
What is the best way to do array slicing with deques?
deque objects don’t support slicing themselves, but you can make a new deque:
sliced_deque = deque(list(old_deque)[3:])
collections.deque objects don’t support slicing. It’d be more straightforward to make a new one.
n_deque = deque(list(d)[3:])
Iterating is probably faster than brute-force methods (note: unproven) due to the nature of a deque.
>>> myDeque = collections.deque([0,1,2,3,4,5])
>>> list(itertools.islice(myDeque, 3, sys.maxint))
[3, 4, 5]