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Python program to count number of vowels using sets in given string

  • Difficulty Level : Medium
  • Last Updated : 18 Dec, 2019

Given a string, count the number of vowels present in given string using Sets.

Prerequisite: Sets in Python

Examples:

Input : GeeksforGeeks
Output : No. of vowels : 5

Input : Hello World
Output : No. of vowels :  3

Approach:
1. Create a set of vowels using set() and initialize a count variable to 0.
2. Traverse through the alphabets in the string and check if the letter in the string is present in set vowel.
3. If it is present, the vowel count is incremented.

Below is the implementation of above approach:




# Python3 code to count vowel in 
# a string using set
  
# Function to count vowel
def vowel_count(str):
      
    # Initializing count variable to 0
    count = 0
      
    # Creating a set of vowels
    vowel = set("aeiouAEIOU")
      
    # Loop to traverse the alphabet
    # in the given string
    for alphabet in str:
      
        # If alphabet is present
        # in set vowel
        if alphabet in vowel:
            count = count + 1
      
    print("No. of vowels :", count)
      
# Driver code 
str = "GeeksforGeeks"
  
# Function Call
vowel_count(str)

Output:

No. of vowels : 5
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