6.单分支，双分支，多分支和练习题

# 流程控制
# 单分支
today_weather="rainday"
if today_weather=="rainday":
    print("take your unberate")
#双分支
age_of_oldboy=58
if age_of_oldboy>50:
    print("too old")
else:
    print("too young")


# python 通过缩进来判断代码块。，同样层级代码，缩进一致，顶级代码定行写，官方建议四个空格是缩进

#多分支
score=89

if score<60:
    print("不合格")
elif score <80:
    print("合格")
elif score<90:
    print("一般般")
else:
    print("niubility")

练习题
ABCDE

A 90-100
B 80-89
C 70-79
D 60-69
E 0-59

while 1:
    fenshu=int(input("请输入你的成绩："))
    if fenshu>=90 and fenshu<100:
        print("得分a")
    elif fenshu>=80 and fenshu<90:
        print("得分b")
    elif fenshu>=70 and fenshu<80:
        print("得分c")
    elif fenshu>=60 and fenshu<70:
        print("得分d")
    else:
        print("得分e")


# 猜随机数小程序
import  random
n=random.randint(1,10)
print(n)
while 1:
    user_guess=int(input("请输入："))
    if user_guess>n:
        print("太大了")
    elif user_guess<n:
        print("太小了")
    else:
        print("niubility")