関連ワード:  how to count a string in python    how to calculate a string in python    how to count vowels in a string in python    how to count characters in a string in python    how to count substring in a string in python    how to count consonants in a string in python    how to count words in a string in python    how to count letters in a string in python    how to count length of a string in python    how to count occurrences of a string in python