python从入门到实践-5章if语句

weixin_33868027

于 2018-10-30 22:14:00 发布

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文章标签： python

原文链接：http://www.cnblogs.com/vwei/p/9879982.html

本文通过两个示例详细介绍了Python中if-else、if-elif-else语句的使用，以及如何检查列表是否为空，并针对不同情况执行相应操作。示例包括汽车品牌名的打印和比萨配料的添加过程。

#！/user/bin/env python

cars = ['audi','bmw','subaru','toyota']
for car in cars:
if car == 'bmw':
print(car.upper())
else:
print(car.title())

# == !=
# <= >=
# and or
# in not in
# True False
# if-else
# if-elif-elif-else # 选择一个执行
requesed_toppings = ['mushrooms','green peppers','extra cheese']
for requesed_topping in requesed_toppings:
if requesed_topping == 'green peppers':
print("Sorry,we are out of green peppers now.")
else:
print("Addin" + requesed_topping + ".")
print('\nFinished making your pizza!')

# 确定列表不是空
requesed_toppings = []
if requesed_toppings:
for requesed_topping in requesed_toppings:
print("Adding" + requesed_topping + ".")
print("\nFinished making your pizza!")
else:
print("Are you sure you want a plain pizza?")

转载于:https://www.cnblogs.com/vwei/p/9879982.html