nt_lowercase_vowels</code></h2>		
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def count_lowercase_vowels(s):
    """ (str) -> int
	
    Return the number of vowels (a, e, i, o, and u) in s.
	
    >>> count_lowercase_vowels('Happy Anniversary!')
    4
    >>> count_lowercase_vowels('xyz')
    0
    """
	
    num_vowels = 0
	
    for char in s:
        if char in 'aeiou':		
            num_vowels = num_vowels + 1
	return num_vowels
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