2017-5-15 if语句的使用

简单实例：

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

for car in cars:
if car == 'bmw':
print(car.upper())
else:
print(car.title())

 

条件测试：

car = 'bmw'

car == 'bmw'

返回True             区分大小写

 

age_0 = 20
age_1 = 18
if age_0 >= 21 and age_1 >=15:                        and两个条件都需满足
print('True')
else:
print('Flase')

 

age_0 = 20
age_1 = 18
if age_0 >= 21 or age_1 >=15:               or满足一个条件即可

print('True')
else:
print('Flase')

 

shopping = ['iphone','meat','apple','ice cream']               检查特定值是否包含在列表中，不包含则用not in

if 'iphone' in shopping:
print ('True')

 

条件判断：

requested_topping = 'mushrooms'
if requested_topping != 'an':
print('LLL')

 

 

 

 

 

if语句：

简单的if语句只有一个测试和一个操作：

age = 19
if age >= 18:
print('you are old boy')

 

if else语句：

age = 17
if age >= 18:
print('you are old boy')
else:
print('yeoyeoyeo')

 

if elif else 语句：

age = 12
if age < 4:
print('your admission cost is $0')
elif age < 18:
print('your admission cost is $5')
else:
print('your admission cost $10')

 

count = list(range(0,11))
for i in count:
if i == 1:
print('1st')

elif i ==2:
print('2nd')

elif i == 3:
print(str(i) + 'rd')

else:
print(str(i) + 'th')