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Python | Count and display vowels in a string

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  • Difficulty Level : Basic
  • Last Updated : 03 Nov, 2022
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In this program, we need to count the number of vowels present in a string and display those vowels. This can be done using various methods. In this article, we will go through few of the popular methods to do this in an efficient manner. 
Examples: 
 

In a simple way
Input : Geeks for Geeks
Output :
5
['e', 'e', 'o', 'e', 'e']

This is in a different way
Input : Geeks for Geeks
Output : {'u': 0, 'o': 1, 'e': 4, 'a': 0, 'i': 0}

 

 

Counting vowels: String Way

In this method, we will store all the vowels in a string and then pick every character from the enquired string and check whether it is in the vowel string or not. The vowel string consists of all the vowels with both cases since we are not ignoring the cases here. If the vowel is encountered then count gets incremented and stored in a list and finally printed. 
 

Python3




# Python code to count and display number of vowels
# Simply using for and comparing it with a
# string containing all vowels
def Check_Vow(string, vowels):
    final = [each for each in string if each in vowels]
    print(len(final))
    print(final)
     
# Driver Code
string = "Geeks for Geeks"
vowels = "AaEeIiOoUu"
Check_Vow(string, vowels);

Output: 
 

5
['e', 'e', 'o', 'e', 'e']

 

Counting vowels: Dictionary Way

This also performs the same task but in a different way. In this method, we form a dictionary with the vowels and increment them when a vowel is encountered. In this method, we use the case fold method to ignore the cases, following which we form a dictionary of vowels with the key as a vowel. This is a better and efficient way to check and find the number of each vowel present in a string. 
 

Python3




# Count vowels in a different way
# Using dictionary
def Check_Vow(string, vowels):
     
    # casefold has been used to ignore cases
    string = string.casefold()
     
    # Forms a dictionary with key as a vowel
    # and the value as 0
    count = {}.fromkeys(vowels, 0)
     
    # To count the vowels
    for character in string:
        if character in count:
            count[character] += 1   
    return count
     
# Driver Code
vowels = 'aeiou'
string = "Geeks for Geeks"
print (Check_Vow(string, vowels))

Output: 
 

{'u': 0, 'o': 1, 'e': 4, 'a': 0, 'i': 0}

 Counting vowels: regex way 

We can also use this method to perform this task. We can use the regular expression to perform this task. We use re.findall() method to find all the vowels in string make list with them. We use len on list to find total vowels in string. 

Python3




import re
# Count vowels in a different way
# Using re.findall
def Check_Vow(string, vowels):
     
    # Using re.findall in string
    str_list = re.findall(f'[{vowels}]', string, re.I)
     
    # printing length of string
    print(len(str_list))
     
    # Returning the list of matched element
    return str_list
     
# Driver Code
vowels = 'aeiou'
string = "Geeks for Geeks"
print (Check_Vow(string, vowels))

Output:

5
['e', 'e', 'o', 'e', 'e'] 

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