In this program, given a user input string. We have to count number of vowels in this string. Here we use set in Python. Set is an unordered collection data type that is iterable, mutable and no duplicate elements.
Input : str1=pythonprogram Output : 3
Step 1: First we use one counter variable which is used to count the vowels in the string. Step 2: Creating a set of vowels. Step 3: Then traverse every alphabet in the given string. Step 4: If the alphabet is present in the vowel set then counter incremented by 1. Step 5: After the completion of traversing print counter variable.
# Program to count vowel in # a string using set def countvowel(str1): c = 0 # Creating a set of vowels s="aeiouAEIOU" v = set(s) # Loop to traverse the alphabet # in the given string for alpha in str1: # If alphabet is present # in set vowel if alpha in v: c = c + 1 print("No. of vowels ::>", c) # Driver code str1 = input("Enter the string ::>") countvowel(str1)
Enter the string ::> pythonprogram No. of vowels ::> 3