Python的If条件判断练习

练习题来自于《Python编程：从入门到实践》

#5.1假设在游戏中刚射杀了一个外星人，请创建一个名为alien_color的变量，并将其设置
#为'green'、'yellow'或'red'
aline_color=('green','yellow','red')
if 'green' in aline_color:
        print('Get 5 point')
if 'yellow' not in aline_color:
        print(null)

#5.2编写一个if-else结构
for aline in aline_color:
    if aline=='green':
        print('Get 5 point')
    else:
        print('Get 10 point')

#5.3 if-else结构改为if-elif-else结构
for aline in aline_color:
    if aline=='green':
        print('get 5 point')
    elif aline =='yellow':
        print('get 10 point')
    else:
        print('get 15 point')

#5.4 设置变量age的值，再编写一个ifelif-else结构，根据age的值判断处于人生的哪个阶段。
age=25
if age<2:
    print('you are a baby')
elif age>=2 and age<4:
    print('you are studying limp')
elif age>=4 and age<13:
    print('you are a child')
elif age>=13 and age<20:
    print('you are a teenager')
elif age>=20 and age<65:
    print('you are a adult')
else:
    print('you are a older')