字符串操作转大写name="hellopython"name=name.upper()print(name)#outputisHELLOPYTHONchangeletterstolowercasename="HELLOPYTHON"name=name.lower()print(name)#输出是hellopython首字母大写name="hellopyton"name=name.title()print(name)#输出是HelloPython去掉空格name="hellopython"name=name.strip()print(name)#输出为“hellopython”，两边的空格会被去掉，但是两个单词之间的空格不会被去掉
