cars = ['audi', 'bmw', 'subaru', 'toyota']

for car in cars:
    #判断当car是bmw的时候全大写打印，其他首字母大写打印
    if car == 'bmw':
        print(car.upper())
    else:
        print(car.title())

car = 'Audi'
#lower可将变量转换为小写再判断是否相等
print(car.lower() == 'audi')
print(car)