python if else

# study python 2019-02-11cars = ['audi','bmw','toyota','subaru']for car in cars:if car == 'bmw':print(car.upper())else:print(car.lower())car = "Audi"
# python 咋检查是否相等时不考虑大小写
print(car == 'audi')  # False
print(car == 'AUDI')  # False
print(car.lower() == 'audi')  # True# 检查是否不相等
age = 20
if age != 10:print("yes")# 检查特定的值是否在列表中存在
encryptionMethod = ['hash','md5','aes']
if 'hash' in encryptionMethod:print("the key is exist in list")
else:print("the key is not exist in list")# 检查特定的值是否不存在列表中
if 'song' not in encryptionMethod:print("yes")
else:print("no it exist")# if else 语句
num = 20
if num > 10:print("the result is true")
else:print("the result is false")# if-elif-else 语句
age = 20
if age < 4:print("your are free")
elif age < 10:print("you need pay 4.0$")
else:print("you need pay 14.0$")# 确定列表不是空的# python 在列表至少有一个元素时返回 True. 空列表返回 False
array = ['1']
if array:print("ok finish your pizza")
else:print("Are you sure you want a plain pizza")