script_12.py - Count Vowels in a String

Code

#!/usr/bin/env python3
"""Count vowels in a string"""

text = input("Enter text: ")
vowels = "aeiouAEIOU"
count = 0

for char in text:
    if char in vowels:
        count += 1

print(f"Number of vowels: {count}")

Explanation

Line 4: text = input("Enter text: ") - text is string type, stores input to analyze

Line 5: vowels = "aeiouAEIOU" - String literal containing all vowels (lowercase and uppercase) - Used as a set of characters to check against - String type, but treated like a collection

Line 6: count = 0 - Counter variable initialized to 0 (integer type) - Will be incremented in loop

Line 8: for char in text: - Iterates over each character in string - char is string of length 1 (single character)

Line 9: if char in vowels: - in checks if char exists anywhere in vowels string - Returns boolean - Works because strings are sequences of characters

Line 10: count += 1 - Increments counter by 1 - Only executes when character is a vowel - += equivalent to count = count + 1