1. if语句
cars = ['audi','bmw','subaru','toyota']
for car in cars:
if car == 'bmw': #在python中都是用 : 来进入下一级
print(car.upper())
else:
print(car.title())
car1 = 'audi'
print(car1 == 'Audi') #python中会检查大小写
requested_topping = "mushroom"
if requested_topping != 'anchovies': #python中的不等于判断 以及不需要括号
print("Hold the anchovies")
age_0 = 23
age_1 = 26
print(age_0>22 and age_1>22) #and 需要两个条件都满足 可添加括号
print(age_0<22 or age_1<22) #or 只需要满足其中一个条件即可 可添加括号
是否在列表中，使用in
# in list or not
requested_toppings = ['mushroom','onions','pineapple']
a = 'mushroom' in requested_toppings
b = 'pepper' in requested_toppings
print(a) #true
print(b) #false
food = 'pepper'
if food not in requested_toppings:
print(food.title() + ' should also be added to the list')
