to count total number of vowel from 0 to n
def countVovels ( str , n ) : NEW_LINE INDENT if ( n == 1 ) : NEW_LINE INDENT return isVowel ( str [ n - 1 ] ) ; NEW_LINE DEDENT return ( countVovels ( str , n - 1 ) + isVowel ( str [ n - 1 ] ) ) ; NEW_LINE DEDENT