#检查是否相等
cars = ["bmw", "audi", "toyota", "subaru"]
for car in cars:if car == 'bmw':print(car.upper())else:print(car.title())#忽略大小写是否相等
car = "Audi"
if (car.lower()  == "audi"):print(True)#检查是否不相等
request_topping = 'mushrooms'
if request_topping != 'anchovies':print("Hold the anchovies!")#多个条件
age_0 = 22
age_1 = 18
if age_0 >= 21 and age_1 >= 21:print(f"and True")
else:print(f"and False")if age_0 >= 21 or age_1 >= 21:print(f"or True")
else:print(f"or False")#布尔表达式
game_active = True
can_edit = False#if-elif-else
age = 12
if age < 4:print("You admission cost is $0.")
elif age < 18:print("You admission cost is $25.")
else:print("You admission cost is $40.")#确定列表不是空的
request_topping = []
if request_topping:for req in request_topping:print(req)
else:print("Are you sure you want a plain pizza?")#使用多个列表
available_toppings = ["mushrooms","olives","green peppers","pepperoni","pineapple","extra cheese"]
request_topping = ["mushrooms","french fries","extra cheese"]
for req in request_topping:if req in available_toppings:print(f"Adding {req}")else:print(f"Sorry, we don't have {req}")