访客名单：
编写一个while循环，提示用户输入其名字。用户输入名字后，在屏幕上打印一句问候语，并将一条访问记录添加到文件guest_book.txt中。确保这个文件中的每条记录都独占一行。
filename = 'guest_book.txt'while True:msg = "What is your name?\n"msg += "(Enter 'quit' to end.)\n"name = input(msg)if name == 'quit':breakelse:with open(filename,'a') as file_object:file_object.write(name + "\n")print("Welcome to here, " + name + "\n")