Python编程从入门到实践~if语句-优快云博客

这篇博客探讨了Python中的条件判断语句，包括检查相等、忽略大小写比较、不相等判断以及多个条件的组合。示例涵盖了if-elif-else结构以及列表操作，如检查列表是否为空和在列表中查找元素。此外，还涉及了布尔表达式的应用。

#检查是否相等
cars = ["bmw", "audi", "toyota", "subaru"]
for car in cars:
	if car == 'bmw':
		print(car.upper())
	else:
		print(car.title())

#忽略大小写是否相等
car = "Audi"
if (car.lower()  == "audi"):
	print(True)


#检查是否不相等
request_topping = 'mushrooms'
if request_topping != 'anchovies':
	print("Hold the anchovies!")


#多个条件
age_0 = 22
age_1 = 18
if age_0 >= 21 and age_1 >= 21:
	print(f"and True")
else:
	print(f"and False")


if age_0 >= 21 or age_1 >= 21:
	print(f"or True")
else:
	print(f"or False")


#布尔表达式
game_active = True
can_edit = False


#if-elif-else
age = 12
if age < 4:
	print("You admission cost is $0.")
elif age < 18:
	print("You admission cost is $25.")
else:
	print("You admission cost is $40.")


#确定列表不是空的
request_topping = []
if request_topping:
	for req in request_topping:
		print(req)
else:
	print("Are you sure you want a plain pizza?")



#使用多个列表
available_toppings = ["mushrooms","olives","green peppers","pepperoni","pineapple","extra cheese"]
request_topping = ["mushrooms","french fries","extra cheese"]
for req in request_topping:
	if req in available_toppings:
		print(f"Adding {req}")
	else:
		print(f"Sorry, we don't have {req}")