Write a Python program to count the number of vowels in a given string :

vowels = set("aeiouAEIOU")
count = 0
string = input("Enter a string: ")
for char in string:
    if char in vowels:
        count += 1
print("The number of vowels in the string is:", count)

Output :

Enter a string: priya
The number of vowels in the string is: 2

• The program defines a set of vowels to check against. It uses the set() function to create a set of the characters "a", "e", "i", "o", and "u", as well as their uppercase equivalents.

• By creating a set, the program ensures that each character appears only once in the set, and it can check if a character is a vowel by using the in operator, which checks if an item is in a set in constant time.

• The program initializes a counter to zero. This counter will be used to keep track of the number of vowels in the string. The program prompts the user to enter a string by calling the built-in input() function.

• The user's input will be stored in the string variable. The program iterates over each character in the string by using for loop.

• For each character in the string, it checks if the character is in the set of vowels defined earlier. If the character is a vowel, the program increments the counter by 1. Finally, the program prints the final count of vowels in the string by using the print() function.

• The output will be a string that includes the message "The number of vowels in the string is:" followed by the value of the count variable.

---

If you are a beginner and want to know more about Python programming, you can read my Basics of Python blogs (From part 1 to part 15).

---

HAPPY LEARNING !!!