関連ワード:  how to check for a string python    how to check for a substring python    how to check for numbers in a string python    how to check for letters in a string python    how to check for spaces in a string python    how to check for characters in a string python    how to check for vowels in a string python    how to check for symbols in a string python    how to check for words in a string python    how to check for duplicates in a string python