What are the different methods available for a deque in Python?

What are the different methods available for a deque in Python?

In Python, a deque (double-ended queue) has several methods like append(), appendleft(), pop(), popleft(), extend(), and extendleft(). Would you like details on any specific method?

Can you explain how append() and appendleft() work?

Sure! The append() method adds an element to the right end of the deque, while appendleft() adds an element to the left end. For example, if you have a deque with elements [1, 2, 3] and you use append(4), it becomes [1, 2, 3, 4]. If you use appendleft(0), it becomes [0, 1, 2, 3].

What about pop() and popleft()?

The pop() method removes and returns an element from the right end of the deque, while popleft() removes and returns an element from the left end. So, if your deque is [0, 1, 2, 3] and you call pop(), it will return 3 and the deque will become [0, 1, 2]. Calling popleft() will return 0 and change it to [1, 2].

Are there any methods for extending a deque?

Yes! You can use extend() to add multiple elements to the right end and extendleft() to add multiple elements to the left end. For example, extend([4, 5]) will add 4 and 5 to the right, while extendleft([0, -1]) will add 0 and -1 to the left.