How do you count vowels in python?

This is a Python Program to count the number of vowels in a string.

Problem Description

The program takes a string and counts the number of vowels in a string.

Problem Solution

1. Take a string from the user and store it in a variable.
2. Initialize a count variable to 0.
3. Use a for loop to traverse through the characters in the string.
4. Use an if statement to check if the character is a vowel or not and increment the count variable if it is a vowel.
5. Print the total number of vowels in the string.
6. Exit.

Program/Source Code

Here is source code of the Python Program to remove the nth index character from a non-empty string. The program output is also shown below.

string=raw_input("Enter string:")
vowels=0
for i in string:
      if(i=='a' or i=='e' or i=='i' or i=='o' or i=='u' or i=='A' or i=='E' or i=='I' or i=='O' or i=='U'):
            vowels=vowels+1
print("Number of vowels are:")
print(vowels)

Program Explanation

1. User must enter a string and store it in a variable.
2. The count variable is initialized to zero.
3. The for loop is used to traverse through the characters in the string.
4. An if statement checks if the character is a vowel or not.
5. The count is incremented each time a vowel is encountered.
6. The total count of vowels in the string is printed.

Runtime Test Cases

 
Case 1:
Enter string:Hello world
Number of vowels are:
3
 
Case 2:
Enter string:WELCOME
Number of vowels are:
3

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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

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

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:

def vowel_count(str):

    count = 0

    vowel = set("aeiouAEIOU")

    for alphabet in str:

        if alphabet in vowel:

            count = count + 1

    print("No. of vowels :", count)

str = "GeeksforGeeks"

vowel_count(str)

Output:

No. of vowels : 5