1、使⽤⽅法（3个方法）修改字符串的⼤⼩写，在字符串（f字符串）中使⽤变量
first_name = input('Enter your first name: ')
last_name = input('Enter your last name: ')
full_name = f"{first_name} {last_name}"
full_name = full_name.lower() # 将异形大小写，全部改为小写保存
print(f"hello, {full_name.title()},你的大写名字是：{full_name.upper()}")
message = f"hello, {full_name.title()},你的大写名字是：{full_name.upper()}"
print(message)
2、使⽤制表符(\t)或换⾏符(\n)来添加空⽩
language = "\n\t python \t Django \n\t java \t spring \n\t dart \t flutter"
language = language.title()
print(language)
3、使用方法(3个方法)删除空白
favourite_language = ' python '
print(f"{favourite_language.strip()} # 删除两侧空白")
print(f"{favourite_language.rstrip()} # 删除右侧空白")
print(f"{favourite_language.lstrip()} # 删除左侧空白")
favourite_language = favourite_language.strip()
print(favourite_language.title())
4、使用方法(2个方法)删除前缀和后缀
simple_url = "https://www.baidu.com"
file_name = "simple.txt"
print(simple_url.removeprefix('https://')) # 删除前缀
print(file_name.removesuffix('.txt')) # 删除后缀
file_name = file_name.removesuffix('.txt')
print(file_name)
