Array Basics

An array is a list of items stored at contiguous memory locations. It is a data structure that can hold multiple values of the same type.

Array elements are accessed using their index, which starts from 0. For example, in an array arr = [1, 2, 3], arr[0] will give you the first element (1), arr[1] will give you the second element (2), and so on.

Basic Syntax

Creating an Array

Empty Array: arr = []
Array with Elements: arr = [1, 2, 3]

Adding Elements

Append Element: arr.append(4)
Insert Element at Index: arr.insert(1, 5)
Extend Array: arr.extend([6, 7])

Accessing Elements

Accessing First Element: arr[0]
Accessing Second Element: arr[1]
Accessing Last Element: arr[-1]

Modifying Elements

Setting Element: arr[0] = 10
Direct Modification:

arr[1] += 5
arr[2] *= 2
arr[3] -= 1
arr[4] /= 2

Removing Elements

Remove Element by Value: arr.remove(2)
Remove Element by Index: arr.pop(1)
Clear Array: arr.clear()

Get Length of Array

len(arr)

Sort Array

arr.sort()
arr = sorted(arr)

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