#!/usr/bin/env pythonoldboy_age = 56

#while True 是个死循环，需要用break来退出

while True:    get_num = int(input("Pls guess oldboy\'s age:"))    if get_num == oldboy_age:        print("Oldboy is {age} years old.".format(age=get_num))        break    elif get_num > oldboy_age:        print("Your input is larger than his age.")    else:        print("Your input is smaller than his age.")

运行结果：

D:\Python\Python36\python.exe "E:/python 14/day0101.py"Pls guess oldboy's age:99Your input is larger than his age.Pls guess oldboy's age:22Your input is smaller than his age.Pls guess oldboy's age:56Oldboy is 56 years old.Process finished with exit code 0