Count Vowels - codepath/compsci_guides GitHub Wiki

Unit 3 Session 1 (Click for link to problem statements)

U-nderstand

Understand what the interviewer is asking for by using test cases and questions about the problem.

• Can the string include capital and lowercase characters?
  • Yes, we will want to account for this.

P-lan

Plan the solution with appropriate visualizations and pseudocode.

General Idea: Compare each character of the input string to vowels and sum the occurrences.

1) Set a string of vowels to compare to later
2) Set the count of vowels found to 0
3) Loop through the input string
  a) If the lowercase version of the character is in the string of vowels, add one to the count
4) Return the count of vowels

I-mplement

def vowel_count(s):
    vowels = "aeiou"
    count = 0
    for char in s:
        if char.lower() in vowels:
            count += 1
    return count