# Write a Python program to count number of vowels using sets in given string # Python3 code to count vowel in # a string using set  # Function to count voweldef 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 Callvowel_count(str)