#7测试
#7.1
my_number = 25
if my_number <20:
    print("Under < 20:")
else:
    print("20 or over")
#7.3 检测一个数是否大于30但小于等于40
number = float(input("输入一个数字!"))
if number > 30 and number <= 40:
    print("这个数",number,"大于30但小于等于40")
else:
    print("其它数！")

7.4 检测输入的Q是否大小写
letter = input("请输入大写Q或者小写q:")
if letter =="Q":
    print("输入的字母是大写Q.")
else:
    print("输入的字母是小写q.")

#7动手试一试

#7.1 一商家降价促销 10元以内给%10折扣，大于10 则给%20折扣
price = float(input("询问下商品价格："))
if price <= 10:
    print("商品打10%折扣，价格为",price*(1-0.1))
else:
    print("商品打20%折扣，价格为",price*(1-0.2))
#7.2
sex = input("请问你的性别是男还是女:")
if sex == "男":
    print("你不能参加球队.")
else:
    age =float(input("请问你的年龄："))
    if age >= 10 and age <= 12:
        print ("You can  jion us.")
    else:
        print("Sorry,You can't jion us.")
#7.3加油问题
size = float(input("请问你的油箱多大尺寸？"))
full = float(input("你的油箱有多满百分比？"))
kmper = float(input("汽油每升可以跑多少千米"))
kmgo = (size-5)*full/100*kmper #5升为缓冲区，以防油表不准
print("You can go another",kmgo,"km.")
print("The next gas station is 200 km away.")
if kmgo >200 :
    print("You can wait for the next station!")
else:
    print("Get gas now!")

7.4 建立一个程序，判断用户输入密码才能进入这个程序。我用7.2的例子来进行这个游戏。

import easygui
password = easygui.enterbox("请输入你的密码：")
if password == "password":
    easygui.msgbox("You can play this game!")
    sex = input("请问你的性别是男还是女:")
    if sex == "男":
        print("你不能参加球队.")
    else:
        age =float(input("请问你的年龄："))
        if age >= 10 and age <= 12:
            print ("You can  jion us.")
        else:
            print("Sorry,You can't jion us.")
else:
    easygui.msgbox("You can't paly the game!")