Python Program on Array Methods

In this article, we will explore a Python program that demonstrates various methods of the array module. The array module provides an efficient way to store and manipulate arrays in Python. The program covers essential methods like pop(), tolist(), append(), index(), remove(), count(), reverse(), and insert(). Understanding these methods is crucial for effective array manipulation in Python.

Prerequisites

• Familiarity with arrays.
• Understanding of array methods.
• Knowledge of taking user input in Python.

Topic Explanation

This program commences by initializing an integer array using the array module, setting the stage for exploring its functionalities. It demonstrates various methods within the module to alter and handle the array efficiently. These include pop(), which eliminates the array’s last element, and tolist(), a method for transforming the entire array into a list format. Other methods like append() are used for incorporating new elements into the array.

Further, the program explores additional capabilities of the array module. It employs the index() function to determine the position of a specific element, and remove() to eliminate an element’s first occurrence. For tallying how many times an element appears, count() is utilized. Additionally, reverse() facilitates the inversion of the array’s order, while insert() allows for the addition of elements at designated positions, enhancing the array’s versatility.

Code:

# Methods of Array module
import array as arr

# Creating an array of integers
myarr = arr.array('i', [10, 20, 30, 6, 77, 55, 88, 66, 99, 44, 1001])

# Printing the array
print(myarr)

# The below line of code removes the last element from myarr using pop()
myarr.pop()

# Converting the array to a list
mylist = myarr.tolist()

# Appending "Data Flair" to the list
mylist.append("Data Flair")

# Printing the modified list
print(mylist)

# Finding the index of the first occurrence of 77 in the array
print(mylist.index(77))  # Use mylist instead of myarr

# Displaying the length of the array before removing an element
print("Before remove ", len(mylist))  # Use mylist instead of myarr

# Removing the first occurrence of 77 from the list
mylist.remove(77)  # Use mylist instead of myarr

# Displaying the length of the array after removing an element
print("After remove ", len(mylist))  # Use mylist instead of myarr

# Printing the modified array
print(mylist)

# Taking user input for the limit of the array
n = int(input("Input size of array"))

# Taking user input for array elements
print("Enter elements in the array")
for i in range(n):
    x = int(input())
    mylist.append(x)  # Use mylist instead of myarr

# Taking user input for a number to search in the array
s = int(input("Enter a number for search"))

# Counting the occurrences of the specified number in the list
n = mylist.count(s)  # Use mylist instead of myarr

# Checking if the number was found or not
if n > 0:
    print("Searching success")
else:
    print("Searching not success")

# Reversing the list
mylist.reverse()  # Use mylist instead of myarr

# Inserting the number 720 at the beginning of the list
mylist.insert(0, 720)  # Use mylist instead of myarr

# Counting the occurrences of the number 720 in the list
m = mylist.count(720)  # Use mylist instead of myarr

# Printing the modified list
print(mylist)