Function to count vowels in a string Dry Run in PYTHON

Function to count vowels in a string is an interactive PYTHON dry run visualizer from the Functions programs section. Study the source code, then use the execution controls to follow each step, variable update, highlighted line, and console output.

This page provides a browser-based dry run with source-code highlighting, auto-scroll, voice narration controls, and execution output for learning the program step by step.

Function to count vowels in a string Program Code

def count_vowels(s):
    """Count number of vowels in a string"""
    vowels = "aeiouAEIOU"
    count = 0
    for char in s:
        if char in vowels:
            count += 1
    return count

text = "Hello World"
print(f'Vowels in "{text}": {count_vowels(text)}')

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