5_6 人生的不同阶段 scholarfor

if-elif-else的条件测试使用：

"""
人生的不同阶段
"""
age = int(input("Enter your age:"))
while age != 0:
    if age < 2:
        print("You are baby!")
    elif age >= 2 and age < 4:
        print("You are toddler!")
    elif age < 13:
        print("You are child!")
    elif age < 20:
        print("You are teenager!")
    elif age < 65:
        print("You are adult!")
    else:
        print("You are old people!")
    age = int(input("Enter your age:"))

其中

age >= 2 and age < 4 多余，直接为age < 4即可在这个结构中实现2（含）~4

真的是实践出真知