How to determine the asymptotic complexity of the operation of reading an element in a Python list?

In Python, a list is implemented as a dynamic array. This means that access to an element by index occurs in constant time — O(1).

Example:

my_list = [10, 20, 30, 40]
element = my_list[2]  # access to element with O(1) complexity

Thus, the operation of reading an element by index in a Python list has an asymptotic complexity of O(1).