Test: Arrays - 1 - EmSAT Achieve MCQ

In Python, arrays can be multi-dimensional, meaning you can have arrays of arrays, also known as nested arrays.

Accessing an element in an array in Python has a time complexity of O(1), as the index is used to directly access the element.

The len() function can be used to determine the length of an array in Python. It returns the number of elements in the array.

Python does not have built-in support for arrays. However, it provides lists that can be used as arrays.

In Python, the index of the first element in an array is 0. Indexing starts from 0.

The code arr[1] accesses the element at index 1 in the array arr, which is 4.

The code arr[-2] accesses the second-to-last element in the array arr, which is 20.

The code arr[2:4] retrieves a sublist of arr starting from index 2 (inclusive) and ending at index 4 (exclusive), resulting in [3, 4].

The code arr[-3:-1] retrieves a sublist of arr starting from the third-to-last element (index -3) and ending at the second-to-last element (index -1), resulting in [3, 4].

The code arr[::-1] creates a reversed copy of the array arr.

The code arr[2] = 10 modifies the element at index 2 of arr to be 10.

The code arr.append(6) adds the element 6 to the end of the array arr.

The code arr.remove(3) removes the first occurrence of the element 3 from the array arr.

The code arr.pop(2) removes and returns the element at index 2 of arr.

The code del arr[1:3] deletes the elements at indices 1 and 2 from the array arr.