How to use function to determine case in Python

Python provides isupper(), islower(), and istitle() methods to determine the case of a string. The specific examples are as follows:

For example : (Recommended learning: Python video tutorial)

>>> str_1 = "HELLO PYTHON" # 全大写
>>> str_2 = "Hello PYTHON" # 大小写混合
>>> str_3 = "Hello Python" # 单词首字母大写
>>> str_4 = "hello python" # 全小写

isupper() determines whether it is all uppercase

>>> str_1.isupper()
True
>>> str_2.isupper()
False
>>> str_3.isupper()
False
>>> str_4.isupper()
False

islower() determines whether all lowercase letters

>>> str_1.islower()
False
>>> str_2.islower()
False
>>> str_3.islower()
False
>>> str_4.islower()
True

istitle() determines whether the first letter is capitalized and the rest is lowercase

>>> str_1.istitle()
False
>>> str_2.istitle()
False
>>> str_3.istitle()
True
>>> str_4.istitle()
False

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