How to convert string case in python

In python, the method of converting string case to upper and lower case is very simple. Let me demonstrate it to you below:

upper() converts lowercase letters to uppercase letters; lower() converts uppercase letters to lowercase letters; capitalize() only converts the first letter to uppercase; title() converts each word Convert the first letter to uppercase and the rest to lowercase.

Take PHP as an example and demonstrate it under shell:

>>> str="www.php.cn."
>>> print(str.upper())   # 把所有字符中的小写字母转换成大写字母
WWW.PHP.CN.
>>> print(str.lower()) # 把所有字符中的大写字母转换成小写字母
www.php.cn.
>>> print(str.capitalize())# 把第一个字母转化为大写字母，其余小写
Www.php.cn.
>>> print(str.title())    # 把每个单词的第一个字母转化为大写，其余小写
Www.Php.Cn.

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