I was working on a text-processing project where I needed to quickly count and display vowels in a string.
At first, I thought this would be an easy task. But as I explored, I realized there are multiple ways to achieve this in Python, each with its own advantages.
In this tutorial, I’ll share five simple methods I use to count and display vowels in a string. I’ll also provide full working code examples so you can try them out directly.
Methods to Count and Display Vowels in a String in Python
Let me explain to you the methods to count and display vowels in a string in Python.
Method 1: Use Equality Operator (==) in Python
Python provides this equality operator to check whether both operands are equal. The == operator is the equality operator in Python.
input_string = input('Enter the proverb :')
count = 0
String = input_string.lower()
for vowel in String:
if vowel == 'a' or vowel == 'e' or vowel == 'i' or vowel == 'o' or vowel == 'u' :
count+=1
if count == 0:
print('No vowels found')
else:
print('Total numbers of vowels in proverb are :' + str(count))String = input_string.lower()
for vowel in String:
if vowel == 'a' or vowel == 'e' or vowel == 'i' or vowel == 'o' or vowel == 'u' :I executed the above example code and added the screenshot below.
I have used the .lower() built-in Python function to convert the input_string into lowercase, so there will be fewer conditions to apply. Here, Python == operator is used to compare both operands.
Method 2: Use Python’s in operator
Another approach is to count the number of vowels in Python in a string using the in operator. In Python, the in operator determines whether a given value is present in the given sequence (like a string, array, list, or tuple).
Phrase = "Jump for Joy"
count = 0
vowels = ["a", "e", "i", "o", "u"]
for i in range(len(Phrase)):
if Phrase[i] in vowels:
count += 1
print("Number of vowels in the given string is: ", count)for i in range(len(Phrase)):
if Phrase[i] in vowels:I executed the above example code and added the screenshot below.
In the above example, I have used the or operator in Python to compare the characters with vowels. We can use the in operator in Python to avoid using these many or operators.
Method 3: Use the count() method in Python
The count() method in Python is used to count the number of specified elements in any iterable, like a string or a list.
NewsHeadline = "Biden Administration Begins Medicare Drug Price Negotiations"
vowels = [NewsHeadline.count(x) for x in "aeiou"]
print('Occurences of vowels aeiou: ', vowels)
print('The numbers vowels in this NewHeadline are: ',sum(vowels))vowels = [NewsHeadline.count(x) for x in "aeiou"]
print('Occurences of vowels aeiou: ', vowels)
print('The numbers vowels in this NewHeadline are: ',sum(vowels))Output:
Occurences of vowels aeiou: [3, 6, 9, 3, 1]
The numbers vowels in this NewHeadline are: 22I executed the above example code and added the screenshot below.
Here, I used the count() method in Python to count the occurrences of each vowel, and the sum() method was used to get the total number of vowels in a given string in Python.
Method 4: Use a Python for loop
Python uses a for loop to iterate over elements in a sequence or a collection. This is the source code of Python to count vowels in a given string using a for loop.
Statement = "Great work comes from loving what you do"
vowels = ["a", "e", "i", "o", "u"]
count = 0
for char in Statement:
if char in vowels:
count += 1
print("Number of vowels in the given string is: ", count)for char in Statement:
if char in vowels:
count += 1Output:
Number of vowels in the given string is: 12I executed the above example code and added the screenshot below.
Using a for loop in Python, with the code, we will go through the statement, and the if conditional statement will check if the characters in the given statement are vowels. If it is a vowel, the count will be incremented by +1.
Method 5: Use Python List Comprehension
Python offers List Comprehension, which provides a shorter syntax for creating a new list based on the values of an existing list in a single line.
Quote = "Nothing is impossible, the word itself says ‘I’m possible."
vowel_count = len([char for char in Quote if char in "aeiouAEIOU"])
print("Number of vowels: ", vowel_count)vowel_count = len([char for char in Quote if char in "aeiouAEIOU"])Output:
Number of vowels: 16I executed the above example code and added the screenshot below.
I used Python list comprehension to execute for each element and the for loop, which is used to iterate over the list’s elements. It helps to count the number of vowels in a String using one line of code in Python.
Method 6: Use Recursion
In Python, the process in which a function calls itself is called recursion. It helps to ease the method of solving problems by replacing iterative code with recursive statements.
def count_vowels_recursively(string):
if not string:
return 0
else:
if string[0].lower() in 'aeiou':
return 1 + count_vowels_recursively(string[1:])
else:
return count_vowels_recursively(string[1:])
input_string = "American Airlines Launches Its Longest Non-Stop Flight"
a = count_vowels_recursively(input_string)
print(f"Number of vowels in '{input_string}' is: {a}")Output:
Number of vowels in 'American Airlines Launches Its Longest Non-Stop Flight' is: 17I executed the above example code and added the screenshot below.
Method 7: Use Regular Expressions
Python’s re module provides support for regular expressions, which can be used to solve this problem in a single line of code. Here’s an example:
import re
def count_vowels(string):
return len(re.findall(r'[aeiou]', string, re.IGNORECASE))
# Example usage
name = "Olivia Thompson"
vowel_count = count_vowels(name)
print(f"The name '{name}' contains {vowel_count} vowels.")In this solution, we use the re.findall() function to find all occurrences of vowels in the string. The regular expression pattern r'[aeiou]’ matches any vowel character. The re.IGNORECASE flag ensures that both lowercase and uppercase vowels are considered. The len() function is then used to count the number of vowels found.
Conclusion
I hope the above article on Python provides useful information and makes you understand how to count and Display Vowels in a String in Python.
Here, I have covered six methods to count the number of vowels in Python, such as using equality operators (==), using an in operator, using the count() method, using a for loop, using a regular expression, using list comprehension, and using recursion.
You may also like to read other Python articles:
- Get the Length of a Dictionary in Python
- Convert a Dictionary to a List in Python
- Python Dictionary Count
- Python Dictionary Update
I am Bijay Kumar, a Microsoft MVP in SharePoint. Apart from SharePoint, I started working on Python, Machine learning, and artificial intelligence for the last 5 years. During this time I got expertise in various Python libraries also like Tkinter, Pandas, NumPy, Turtle, Django, Matplotlib, Tensorflow, Scipy, Scikit-Learn, etc… for various clients in the United States, Canada, the United Kingdom, Australia, New Zealand, etc. Check out my profile.
