How to Count Vowels in a String in Python

vowels = "aeiouAEIOU"

my_string = "Hello Universe"

count = 0

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

print(count)

def count_vowels(my_string: str) -> int:
    """
    Function to count the number of vowels in a string

    :param my_string: The input string
    :return: The number of vowels in the actual string
    """
    vowels = "aeiouAEIOU"

    count = 0
    
    for char in my_string:
        if char in vowels:
            count += 1
    return count


example_string = "Hello Universe"
print(count_vowels(example_string))

import pytest

# Assuming the count_vowels function is stored under app.string_operations
from app.string_operations import count_vowels


@pytest.mark.parametrize(
    "input_string, expected_output",
    [("Hello Universe", 6), ("This is a new dawn", 5), ("1234", 0), ("", 0)],
)
def test_count_vowels(input_string, expected_output):
    """
    Test the count_vowels function across various strings

    :param input_string: The string to be tested
    :param expected_output: The expected number of vowels in that string
    """
    assert count_vowels(input_string) == expected_output

============================= test session starts =============================
collecting ... collected 4 items

test_string_operations.py::test_count_vowels[Hello Universe-6] PASSED    [ '25%']
test_string_operations.py::test_count_vowels[This is a new dawn-5] PASSED [ '50%']
test_string_operations.py::test_count_vowels[1234-0] PASSED              [ '75%']
test_string_operations.py::test_count_vowels[-0] PASSED                  ['100%']

============================== 4 passed in '0.01s' ==============================