Define a function which count vowels and consonants in a word in python

Problem: Write a Python program to count the number of vowels and consonants in a given string.

Example:

String: Pencil Programmer
Vowels: 5
Consonants: 12

To count the number of vowels and consonants in a string, we iterate using a for loop through each character of the string and check if it matches a vowel.

If yes then, we increment the vowel counter otherwise increment the consonant counter.

#define all vowels in a list
vowels = ['a', 'e', 'i', 'o', 'u']

#input a string and transform it to lower case
str = input("Enter a string: ").lower()

#define counter variable for both vowels and consonants
v_ctr = 0
c_ctr = 0

#iterate through the characters of the input string 
for x in str:
    #if character is in the vowel list,
    #update the vowel counter otherwise update consonant counter
    if x in vowels:
        v_ctr += 1
    elif x != ' ':
        c_ctr += 1

#output the values of the counters
print("Vowels: ", v_ctr)
print("Consonants: ", c_ctr)

Output:

Enter a string: Pencil Programmer
Vowels: 5
Consonants: 12

Enter a string: Python
Vowels: 1
Consonants: 5

In the above program, we have defined all vowels of the English alphabet in a list and use the same to check for vowels in the string.

Inside the for loop, we check whether the character (x) of the string is present in the vowels list or not.

If yes then it is a vowel, so we increment the vowel counter (v_ctr += 1) otherwise, we increment the counter of consonants (c_ctr += 1).

Finally, we output both counter’s values at the end of the program.

In this article, we will discuss the concept of the Python program to count vowels or consonants of the given string

In this post, we are going to learn how to count the vowels and consonants in the given string in Python  programming language

Python code to count the vowels and consonants using for loop

The program allows the user to enter a string  thereafter It counts the vowels and consonants of the given string using for loop in Python  language

Program 1: Write a program to count the number of vowels and consonants in a given string

When the above program is executed, it produces the following result

Approach

1. Declare and initialize two integer counter variable as int vowels=0 and consonants=0;
2. The user asked to enter a string to count vowels and consonants
3. A for-loop is used to count total vowels and consonants of the given string
4. Use an if statement to test vowel if the test expression is true,  vowels become vowels + 1(vowels=vowels+1)
5. When the if-statement is false, control moves to else part and executes else part statements
6. Finally, the program displays the number of vowels and consonants of the given string.

Python code to count the vowels and consonants using for loop – strlen() function

The program allows the user to enter a string  thereafter It counts the vowels and consonants of the given string using strlen()

Program 2: Write a program to count the number of vowels and consonants in a given string

When the above program is executed, it produces the following result

Approach

1. Declare and initialize two integer counter variable as int vowels=0 and consonants=0;
2. The user asked to enter a string to count vowels and consonants
3. call the str.lower() string function to change upper case lettersto lower case letters
4. A for-loop is used to count total vowels and consonants of the given string using the vowels and consonants variables
5. Use an if statement to test vowel if the test expression is true,  vowels become vowels + 1(vowels=vowels+1)
6. When the if-statement is false, control moves to else part and executes else part statements
7. Finally, the program displays the number of vowels and consonants of the given string.