Python 判断字符串是否为大写及 is 方法延伸

>>> '1a!'.isupper()
False
>>> '1A!'.isupper()
True

>>> '1As!'.islower()
False
>>> '1s!'.islower()
True

>>> 'This Is Upper'.istitle()
True
>>> 'This Is upper1'.istitle()
False

>>> 'This Is upper1'.isspace()
False
>>> ' '.isspace()
True

>>> '1a!'.isalnum()
False
>>> '1a'.isalnum()
True
>>> 'aa'.isalnum()
True
>>> '11'.isalnum()
True

>>> '11'.isalpha()
False
>>> '1a'.isalpha()
False
>>> 'aa'.isalpha()
True

>>> 'aa'.isdigit()
False
>>> '11'.isdigit()
True
>>> '1a'.isdigit()
False