Question

我正在通过一本《学习Python的艰难方法3》学习python。

我完全按照作者的要求去做，但是得到了不同的价值。以下是问题的摘要部分。我目前正在旅途中，所以没有这本书，但这是出于记忆，因为我昨晚尝试了100次。

age = '35'
height = '74'
weight = '180'

total = {age} + {height} + {weight}

print(f"If I add my {age}, {height} and {weight}, I get {total}.")

作者说我应该得到289。但是，我仍然得到3574180。我已经重新输入，反复验证，仍然得到年龄，身高和体重的字符串3574180与所有三个289的总和。我是莫名其妙，并希望得到任何反馈。提前非常感谢您。

Answer 1

您要添加字符串，因此结果是年龄，体重和身高的串联。而是：

total = int(age) + int(height) + int(weight)

这会将值转换为int，可以将它们加在一起

Answer 2

好友发生的事情是您输入的年龄，身高和体重是一个字符串'' 所以总共会发生

total = '35' + '74' + '180'

他们只是合并在一起，而不是这里的计算

要计算字符串，必须将其转换为整数或浮点数

total = int(age) + int(height) + int(weight)

这将执行数学计算，您的代码将正常运行

Answer 3

在解决了逻辑错误之后，我相信正确的程序代码如下。我已经对其进行了几次测试，并据此计算出收益。

barsInACase = 12
costPerCase = 8.00
costPerSingleBar = 1.00

#asks for the user to enter the number of bars they sold
sold = int (input ("How many candy bars did you sale? "))

#calculates the number of cases sold based off of the users input
casesSold = sold / barsInACase

#calculates the net earnings using the users input
netEarnings = (sold * costPerSingleBar) - (casesSold * costPerCase)

#displays the net earnings
print ("Your net earnings are $",
format (netEarnings, ',.2f'), ".", sep="")

#calculates the amount that the SGA gets
studentGovernmentAssociation = netEarnings * 0.10

#calculates the amount that the cheer team gets
cheerTeamsProceed = netEarnings - studentGovernmentAssociation

#displays the amount that the SGA gets
print ('The student government associations earnings are: $',
       format (studentGovernmentAssociation, ',.2f'), ".", sep="")

#displays the amount that the cheer team gets
print('The cheer teams earnings are: $',
      format (cheerTeamsProceed, ',.2f'), ".", sep="")

#displays a congratulatory message if the cheer team gets more than $500
if (cheerTeamsProceed >= 500):
    print ("Congratulations! You have raised $500 or more!")

#displays a sorry message if the cheer team gets less than $500
else:
    print ("Sorry! You did not meet your goal! ")

{}在Python中无法正常计算

3 个答案: