字符串方法
1.capitalize() ：将字符串的第一个字符转换为大写字母
2.title()：将所有单词的第一个字符转换为大写字母
3.upper()：将字符串的所有字符转化为大写字母
4.lower()：将字符串的所有字符转化为小写字母
5.swapcase() ：将字符串的所有字符大小写互换
实例
>>> string = 'while There is life There is hope.' >>> string.capitalize() # 'While there is life there is hope.' >>> string.title() # 'While There Is Life There Is Hope.' >>> string.upper() # 'WHILE THERE IS LIFE THERE IS HOPE.' >>> string.lower() # 'while there is life there is hope.' >>> string.swapcase() # 'WHILE tHERE IS LIFE tHERE IS HOPE.'
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