What is the time complexity of the operation of removing an element from a list in Python?

In Python, lists are implemented as dynamic arrays. The operation of removing an element from a list has different time complexities depending on the method of removal and the position of the element:

• list.pop() without arguments removes the last element — this operation is O(1), as it does not require shifting elements.
• list.pop(i) or del list[i] removes the element at index i. In this case, all elements to the right of i are shifted one position to the left, so the operation takes O(n - i), where n is the length of the list.
• list.remove(value) searches for the first element with the value value and removes it. The search is O(n), and the removal is as above, so total complexity is O(n).

Thus, in the worst case (removing from the beginning of the list), the removal operation is O(n), and in the best case (removing from the end), it is O(1).