[英]How to calculate sum of numbers in a list?
I am trying to write a program in which the user enters the age of 8 guests.我正在尝试编写一个程序,其中用户输入 8 岁的客人。 Each guest's age is priced differently.每位客人的年龄都不同。 How can I add each cost together to come up with the total cost for each guest?如何将每项费用加在一起得出每位客人的总费用? This is what I have written.这就是我写的。
def main():
guest1= int(input("Enter the age of guest 1(in years): "))
guest2 = int(input("Enter the age of guest 2(in years): "))
guest3 = int(input("Enter the age of guest 3(in years): "))
guest4 = int(input("Enter the age of guest 4(in years): "))
guest5 = int(input("Enter the age of guest 5(in years): "))
guest6 = int(input("Enter the age of guest 6(in years): "))
guest7 = int(input("Enter the age of guest 7(in years): "))
guest8 = int(input("Enter the age of guest 8(in years): "))
ages = [guest1, guest2, guest3, guest4, guest5, guest6, guest7, guest8]
getCost(ages)
def getCost(ages):
for age in ages:
if age <=2:
cost = 0
print(cost)
elif age <= 3>12:
cost = 14
print(cost)
elif age >= 65:
cost = 18
print(cost)
else:
cost = 23
print(cost)
main()
You can put all the ages into a list up front by calling input()
in a loop instead of copying and pasting it eight times:您可以通过在循环中调用input()
将所有年龄预先放入一个列表中,而不是复制和粘贴八次:
ages = [int(input(f"Enter the age of guest {i}(in years): ")) for i in range(1, 9)]
I'd suggest having your getCost
function just return the cost for a single age (hint: make this simpler by arranging the age brackets in ascending order, and eliminating them one at a time according to their upper bound):我建议让您的getCost
function 只返回一个年龄的成本(提示:通过按升序排列年龄范围,并根据其上限一次消除一个来简化此操作):
def getCost(age):
if age < 3:
return 0
elif age < 12:
return 14
elif age < 65:
return 23
else:
return 18
This makes the job of getCost
much easier -- then after you've gotten ages
you can compute the total cost just by calling getCost(age)
for each age
and taking the sum
of the result:这使得getCost
的工作变得更加容易——然后在你得到ages
之后,你可以通过为每个age
调用getCost(age)
并获取结果的sum
来计算总成本:
print(sum(getCost(age) for age in ages))
Splitting the logic into parts like this makes it easy to do other things with the costs;将逻辑拆分成这样的部分可以很容易地用成本做其他事情; for example, you could show how the total was computed by join
ing the costs before you sum
them:例如,您可以通过在sum
之前join
成本来显示总计是如何计算的:
print(
" + ".join(str(getCost(age)) for age in ages),
"=",
sum(getCost(age) for age in ages)
)
Enter the age of guest 1(in years): 2
Enter the age of guest 2(in years): 9
Enter the age of guest 3(in years): 13
Enter the age of guest 4(in years): 27
Enter the age of guest 5(in years): 44
Enter the age of guest 6(in years): 52
Enter the age of guest 7(in years): 66
Enter the age of guest 8(in years): 81
0 + 14 + 23 + 23 + 23 + 23 + 18 + 18 = 142
You can start by defining a totalCost
variable, as a running total that you can keep incrementing after you calculate the cost for each customer.您可以从定义一个totalCost
变量开始,作为一个运行总计,您可以在计算每个客户的成本后继续递增。 For instance:例如:
def getCost(ages):
totalCost = 0
for age in ages:
if age <=2:
cost = 0
elif age >= 3 and age < 12:
cost = 14
elif age >= 65:
cost = 18
else:
cost = 23
totalCost += cost
return totalCost
Do note that I've assumed age <= 3>12
refers to ages between 3 and 11, inclusive.请注意,我假设age <= 3>12
是指 3 到 11 岁之间的年龄,包括 3 到 11 岁。
It seems that you use function getCost
to calculate each cost.您似乎使用 function getCost
来计算每个成本。 A little bit modification of adding a variable to sum up all values will help you get what you want.添加一个变量来总结所有值的一点点修改将帮助你得到你想要的。
def sumCost(ages):
total = 0
for age in ages:
if age <=2:
cost = 0
elif age <= 3>12: # your original code may have some problems here. I just keep it.
cost = 14
elif age >= 65:
cost = 18
else:
cost = 23
total = total + cost
return total
Or you can construct a list of cost then use sum
.或者您可以构建成本列表,然后使用sum
。
def sumCost(ages):
costs = []
for age in ages:
if age <=2:
cost = 0
elif age <= 3>12: # your original code may have some problems here. I just keep it.
cost = 14
elif age >= 65:
cost = 18
else:
cost = 23
costs.append(cost)
total = sum(costs)
return total
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