Python 为什么'sum（）'不能在'for'循环csv数据中使用float？

我只能使用一个循环、一个

if

语句，并使用我的only-if语句过滤csv文件中的行，以打印具有相同作业名称的特定行。因此，我使用了一个

尝试

除了

之外的方法来计算平均工资收入

为了在

循环中给出
的值，我使用
sum（）
来填充工资总额，但由于工资是浮动的，所以不起作用。代码如下：

for line in reader:
    name, job, salary = line
    salary = float(salary)
    salary = salary + (salary*0.1)
    instructor_count = len(line)
    total_salaries = sum(salary)

我试着写total_salaries=sum（float，salary），但这给了我一个类型错误

以下是获得完整图片的完整代码：

    import csv
    file = open('SP21-Emp1.txt', 'r')
    reader = csv.reader(file)
    total_salaries = 0
    instructor_count = 0
    print("Reading from file SP21-Emp1.txt" "\n")
    for line in reader:
        name, job, salary = line
        salary = float(salary)
        salary = salary + (salary*0.1)
        instructor_count += 1
        total_salaries += salary
        if job == 'Instructor':
        instructor_count += 1
        total_salaries += salary
        first_name, last_name = name.split(' ', 1)
        print(f'Name: {last_name} {first_name} \t Job: {job} \t Income: {salary}',)
    try:
        average_instructor_salary = total_salaries / instructor_count
    except ValueError:
        print('can not calculate average because there were no instructor salaries found.')
        average_instructor_salary = "No instructor salary found"


my output was this:

    Reading from file SP21-Emp1.txt
    
    Name: Tweijari Bilal     Job: Instructor     Income: 2200.0
    Name: Hachem Nizar       Job: Instructor     Income: 1980.0
    Name: Saeed Walaa        Job: Instructor     Income: 2090.0
    Name: Khattar Nadine     Job: Instructor     Income: 1628.0
    
    The average of the instructors' salaries is: 1493.8

but if you look at the average for my output and the expected output that is coming up you will see that it is different.

    Reading from file SP21-Emp1.txt
    
    Name: Tweijari, Bilal     Job: Instructor     Income: $2200.0
    Name: Hachem, Nizar       Job: Instructor     Income: $1980.0
    Name: Saeed, Walaa        Job: Instructor     Income: $2090.0
    Name: Khattar, Nadine     Job: Instructor     Income: $1628.0
    
    The average of the instructors' salaries is: 1974.5


this is the latest update, i am a certified dumbass, i copyed and pasted the print line in the wrong place... so now i do get a value but it is still not the expected value

    

    import csv
    
    file = open('SP21-Emp1.txt', 'r')
    reader = csv.reader(file)
    total_salaries = 0
    instructor_count = 0
    print("Reading from file SP21-Emp1.txt" "\n")
    for line in reader:
        name, job, salary = line
        salary = float(salary)
        salary = salary + (salary*0.1)
        instructor_count += 1
        total_salaries += salary
        if job == 'Instructor':
            first_name, last_name = name.split(' ', 1)
            print(f'Name: {last_name} {first_name} \t Job: {job} \t Income: {salary}',)
    try:
        average_instructor_salary = total_salaries / instructor_count
        print("\n" "The average of the instructors' salaries is:", average_instructor_salary)
    except ValueError:
        print('can not calculate average because there were no instructor salaries found.')
        average_instructor_salary = "No instructor salary found"
        

工资不是一系列要素。所以sum（薪水）不会给出一个总数。您可以尝试total_salary+=salary
这是我正在运行的代码，它与您的代码完全相同：

import csv
file = open('SP21-Emp1.txt', 'r')
reader = csv.reader(file)
total_salaries = 0
instructor_count = 0
print("Reading from file SP21-Emp1.txt" "\n")
for line in reader:
    name, job, salary = line
    salary = float(salary)
    salary = salary + (salary*0.1)
    instructor_count += 1
    total_salaries += salary
    if job == 'Instructor':
        first_name, last_name = name.split(' ', 1)
        print(f'Name: {last_name} {first_name} \t Job: {job} \t Income: {salary}',)
try:
    average_instructor_salary = total_salaries / instructor_count
    print("\n" "The average of the instructors' salaries is:", average_instructor_salary)
except ValueError:
    print('can not calculate average because there were no instructor salaries found.')
    average_instructor_salary = "No instructor salary found"

以下是我使用的CSV文件：

C:\tmp>cat SP21-Emp1.txt                                         
Tweijari Bilal,Instructor,2000                                   
Hachem Nizar,Instructor,1800                                     
Saeed Walaa,Instructor,1900                                      
Khattar Nadine,Instructor,1480                                   
                                                                 
C:\tmp>

以下是我收到的输出：

C:\tmp>python x.py
Reading from file SP21-Emp1.txt

Name: Bilal Tweijari     Job: Instructor         Income: 2200.0
Name: Nizar Hachem       Job: Instructor         Income: 1980.0
Name: Walaa Saeed        Job: Instructor         Income: 2090.0
Name: Nadine Khattar     Job: Instructor         Income: 1628.0

The average of the instructors' salaries is: 1974.5

salary
只是一个项目，所以
sum（salary）
只是返回salary。你想要的是
total_salaries+=salary
。这是我第一次真正得到一个值，我非常喜欢你的时间……但答案与预期的结果不同。我将编辑我的帖子并显示结果。同样的事情也适用于
讲师\u count=len（line）
。您只需要
讲师计数+=1
。该值现在非常接近，但仍与预期值不同。我的输出为1493.8，预期输出为1974.5。那么我的整个方程一直都错了吗？我剪切并粘贴了你的精确代码，得到了1974.5。你是怎么打印最后一行的？我现在已经打印了，不管出于什么原因，它都没有显示任何价值。这是代码井的最后一次更新我的csv文件是这样的，你能再运行一次吗？Adam Saleet，it支持，1000 Naji Shemmari，注册官，1250 Bilal Tweijari，讲师，2000 Abdallah Mazem，会计师，1000 Nizar Hachem，讲师，1800 Nawwara Sleiman，准入，900 Ameen Sinjer，质量保证官，1400 Walaa Saeed，讲师，1900 Hamid Shami，it支持，850 Nadine Khattar，讲师，1480我是个白痴抱歉，我刚刚发现我接收了所有讲师和非讲师的数据，我把所有数据都放在if语句下，结果成功了。非常感谢你的帮助。愿你有一个幸福的日子