求大家帮我提示这串代码是怎么用的,最好截图演示
import sys
def ageEV():
print('How old are you?')
age=int(sys.stdin.readline())
if age<=15:
print('you are a child!')
elif age>15 and age<40:
print('you are a young!')
else:
print('you are old!')
ageEV()