[英]If/else statements in python
我将如何使用清单中的if和else语句? 就像我有一个预制的列表一样,然后用户输入他们的列表,我将如何使其显示在我们输入相同答案的位置。 这是作业:
选择一个类别,并列出您最喜欢的五件事。 建议的类别包括您最喜欢的:演员,书籍,汽车或其他您选择的物品。
询问用户他们最喜欢的类别在您选择的类别中。
通过创建列表,循环和if语句,打印一条消息,让用户知道其收藏夹是否与列表中的收藏夹匹配。
将整个列表整齐地打印到屏幕上。 确保为每个项目编号。
编写该程序的伪代码。 确保包括任何需要的输入,计算和输出。
这是我当前的代码:
def main():
print("What are your five favorite cars?")
favoriteCarOne = input("What is your first favorite car?")
favoriteCarTwo = input("What is your second favorite car?")
favoriteCarThree = input("What is your third favorite car?")
favoriteCarFour = input("What is your fourth favorite car?")
favoriteCarFive = input("What is your fifth favorite car?")
userCarList = [favoriteCarOne, favoriteCarTwo, favoriteCarThree, favoriteCarFour, favoriteCarFive]
daltonCarList = ["Shelby", "Dodge HellCat", "Nissian GT-R R34", "Ford Focus RS", "Corvette ZR1"]
for n in range(0, len(userCarList)):
print(str(n) + " " + userCarList[n])
daltonLength = len(daltonCarList)
userLength = len(userCarList)
if (userCarList == daltonCarList):
print("Cool! We like the same cars!")
print
else:
print("Those are cool cars!")
print
print("These are my favorite cars!")
print(daltonCarList)
print
main()
Python可以比较两个列表:
a = ["Shelby", "Dodge HellCat", "Nissian GT-R R34", "Ford Focus RS", "Corvette ZR1"]
b = ["Shelby", "Dodge HellCat", "Nissian GT-R R34", "Ford Focus RS", "Corvette ZR1"]
if a == b:
print("They are the same")
else:
print("They are different")
# Outputs: They are the same
但是,如果它们的顺序不同,则将无法使用:
a = ["Shelby", "Dodge HellCat", "Nissian GT-R R34", "Ford Focus RS", "Corvette ZR1"]
b = ["Dodge HellCat", "Shelby", "Nissian GT-R R34", "Ford Focus RS", "Corvette ZR1"]
if a == b:
print("They are the same")
else:
print("They are different")
# Outputs: They are different
根据需求,您似乎需要检查所有元素都存在于两个列表中,但不一定要按顺序检查。 最简单的方法可能是使用两个set
,但是似乎需要使用循环。
相反,也许尝试使用not in
关键字来检查汽车是否存在。 例如:
for car in their_cars:
if car not in my_cars:
print("Oh no, a car that's not in my list")
警告,这不会完成。 假设有人输入"Shelby"
5次,它将通过。 因此,您需要将其反转并向后检查。
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