在Python中,波浪线(波浪线)即`~`运算符是做什么的？

s = "hello"
s = s.replace("h", "*")
s = s.replace("e", "*")
s = s.replace("l", "*")
s = s.replace("o", "*")
print(s)  # 输出 "h*ll*"

name = "Tom"
age = 18
print("My name is {} and I am {} years old.".format(name, age))

My name is Tom and I am 18 years old.