Python Arrays

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Using the Array Module

To use arrays in Python, you need to import the array module and create an array.

Explanation of Code:

Arrays can only hold elements of the same type, specified by a type code.

import array as arr

# Creating an integer array
numbers = arr.array('i', [1, 2, 3, 4, 5])
print(numbers)  # Output: array('i', [1, 2, 3, 4, 5])




Accessing Array Elements

You can access individual elements in an array using indexing.

Explanation of Code:

The index 0 accesses the first element, similar to lists.

print(numbers[0])  # Output: 1
print(numbers[2])  # Output: 3




Modifying Array Elements

Arrays are mutable, meaning you can change their elements after creation.

Explanation of Code:

You can modify elements by accessing them using their index.

numbers[1] = 20
print(numbers)  # Output: array('i', [1, 20, 3, 4, 5])




Adding and Removing Elements

You can add elements to an array using the append() method and remove elements using the remove() method or the pop() method.

  • append() adds an element to the end of the array.
  • remove() removes the first occurrence of a specified value.
  • pop() removes an element at a specified index and returns it.
numbers.append(6)
print(numbers)  # Output: array('i', [1, 20, 3, 4, 5, 6])

numbers.remove(20)
print(numbers)  # Output: array('i', [1, 3, 4, 5, 6])

removed_element = numbers.pop(2)
print(removed_element)  # Output: 4
print(numbers)          # Output: array('i', [1, 3, 5, 6])




Python Arrays Example Code

Explanation of Code:

This program creates arrays, accesses and modifies elements, adds and removes elements.

import array as arr

# Using the array module
# Creating an integer array
numbers = arr.array('i', [1, 2, 3, 4, 5])
print(numbers)  # Output: array('i', [1, 2, 3, 4, 5])

# Accessing elements
print(numbers[0])  # Output: 1

# Modifying elements
numbers[1] = 20
print(numbers)  # Output: array('i', [1, 20, 3, 4, 5])

# Adding and removing elements
numbers.append(6)
print(numbers)  # Output: array('i', [1, 20, 3, 4, 5, 6])

numbers.remove(20)
print(numbers)  # Output: array('i', [1, 3, 4, 5, 6])

removed_element = numbers.pop(2)
print(removed_element)  # Output: 4
print(numbers)          # Output: array('i', [1, 3, 5, 6])




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