関連ワード:  how to check if a string in python is a number    how to check if a string in python contains a substring    how to check if a string in python is empty    how to check if a string in python    how to check for a string in python    how to check if a string exists in python    how to check if a string contains in python    how to check if a string matches in python    how to check if a string has in python    how to check if something is a string in python