![]() ![]() In this code, we first create a deque d with five elements. Here’s how you modify an element: from collections import deque However, unlike lists, deques do not support slicing because they are designed to be primarily append and pop operations on both ends and thus are optimized for such operations. ![]() Python allows negative indexing where -1 refers to the last element, -2 refers to the second last, and so on. When we print d, we get the last element ‘e’. When we print d, we get the first element ‘a’. In the code above, we create a deque d with five elements. If more elements are added, it will automatically remove elements from the opposite end to maintain the size.Īccessing elements in a deque is done by indexing, similar to how you would access elements in a list: from collections import deque This creates a deque with a maximum length of 5. You can also initialize a deque with multiple elements at once, and optionally set a maximum length: d = deque(, maxlen=5) When we print the deque, we see these elements in the order they were added. We append three elements ‘a’, ‘b’, and ‘c’ to the right end of the deque using the append() method. In the above code, we first import the deque class from the collections module. Now, if we print our deque, we’ll get: print(d) ![]() To add elements to the deque, you can use the append() method: d.append('a') Here’s how you create a deque using the collections module: from collections import deque 21 Common Mistakes and Pitfalls in Deque Usage.18 Understanding Thread-Safety in Deque.8 Adding Multiple Elements to the Left End (extendleft()).7 Adding Multiple Elements to the Right End (extend()).6 Adding Elements to the Left End (appendleft()).5 Adding Elements to the Right End (append()). ![]()
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