Python Program to Count the Number of Vowels in a String

Introduction

Counting the number of vowels in a string is a common task in text processing. Vowels in the English language include ‘a’, ‘e’, ‘i’, ‘o’, and ‘u’. This tutorial will guide you through creating a Python program that counts the number of vowels in a given string.

Example:

Input: hello world
Output: Number of vowels: 3
Input: Python Programming
Output: Number of vowels: 4

Problem Statement

Create a Python program that:

Takes a string as input.
Counts the number of vowels in the string.
Displays the total count of vowels.

Solution Steps

Take Input from the User: Use the input() function to get a string from the user.
Initialize a Vowel Count: Set up a counter variable to track the number of vowels.
Iterate Through the String: Use a loop to iterate through each character in the string.
Check for Vowels: Use a conditional statement to check if each character is a vowel.
Increment the Vowel Count: Increase the counter for each vowel found.
Display the Vowel Count: Use the print() function to display the total count of vowels.

Python Program

# Python Program to Count the Number of Vowels in a String
# Author: https://www.rameshfadatare.com/

# Step 1: Take input from the user
input_string = input("Enter a string: ")

# Step 2: Initialize a vowel count
vowel_count = 0

# Step 3: Define a set of vowels
vowels = "aeiouAEIOU"

# Step 4: Iterate through the string and count vowels
for char in input_string:
    if char in vowels:
        vowel_count += 1

# Step 5: Display the vowel count
print(f"Number of vowels: {vowel_count}")

Explanation

Step 1: Take Input from the User

The input() function prompts the user to enter a string. The input is stored in the variable input_string.

Step 2: Initialize a Vowel Count

The vowel_count variable is initialized to 0 to keep track of the number of vowels found in the string.

Step 3: Define a Set of Vowels

A string vowels containing both lowercase and uppercase vowels is defined. This helps in checking for vowels irrespective of the case.

Step 4: Iterate Through the String and Count Vowels

A for loop is used to iterate through each character in the input string. If a character is found in the vowels string, the vowel_count is incremented.

Step 5: Display the Vowel Count

The print() function is used to display the total count of vowels in the string.

Output Example

Example 1:

Enter a string: hello world
Number of vowels: 3

Example 2:

Enter a string: Python Programming
Number of vowels: 4

Example 3:

Enter a string: Learning is Fun
Number of vowels: 5

Conclusion

This Python program demonstrates how to count the number of vowels in a string by iterating through each character and checking if it is a vowel. It’s a practical example that helps beginners understand loops, conditional statements, and string handling in Python.