我正在为小学生做一个小测验

Question

分数应记录在与学生班级有关的.txt文件中。然后，教师应该能够选择一个班级。然后，老师可以选择是按字母顺序看成绩，还是从最近的三个成绩看每个学生的平均分数，还是从最高到最低。

我已经完成了课堂部分，但我有困难，为老师编写代码，选择一个班级，并选择一种方式排序的结果。

到目前为止，这是我的代码：

import random


score=0
name= input('What is your name?')

def class_():
    classNum=input('What class are you in 1,2 or 3?')
    global inputfile
    if classNum=="1": inputfile=open("class1.txt","a")
    elif classNum=="2": inputfile=open("class2.txt","a")
    else: inputfile=open("class3.txt", "a")


print ('Welcome to my quiz', str(name))
print ('You will be asked 10 random questions to test your maths skills')
input("Press Enter to continue...")

range(10)
operatorList=["+","-","*"]
numQuestions=10



for q in range (numQuestions):
    op=random.choice(operatorList)
    first_num = random.randint(0,10)
    second_num = random.randint(0,10)
    print(first_num,op,second_num)
    expression = "%d %s %d" % (first_num, op, second_num) 
    answer = eval(expression) 
    reply = int(input('Enter the answer: '))

    if (reply==answer):
        print("Well done, you got it right!")
        score=score+1
    else:
         print("Unlucky! You got it wrong")


print ('\n')
print ('\n')


print("Well done", str(name))
print("You scored", str(score)+"/10")

class_()
inputfile.write(name + "," + str(score)+ "\n")
inputfile.close()

我认为你必须为老师创造一个全新的代码。

新代码

好的，这是我的新代码的开始：

viewclass= input("choose a class number and either alphabetically, average or highest?")


if viewclass=='1 alphabetically':
    with open('class1.txt', 'r') as r:
        for line in sorted(r):
             print(line, end='')

elif viewclass=='2 alphabetically':
    with open('class2.txt', 'r') as r:
        for line in sorted(r):
             print(line, end='')

elif viewclass=='3 alphabetically':
    with open('class3.txt', 'r') as r:
        for line in sorted(r):
             print(line, end='')

因此，我已经完成了字母部分，但我必须更改第一个代码，只允许每个学生的3个最近的分数存储，或者我可以把它添加到我的第二个。

Answer 1

这不是一个愚蠢的问题，所以我投了赞成票。但是，如果您想要创建一个很好的应用程序，那么您应该真正学习如何在python中处理类和使用对象。贝娄--我向您展示了一些关于如何将问题抽象为python类的技巧，这并不好，我也不太清楚您需要什么，但这只是一个开始。

class Class(object):
    def __init__(self, num, name, input_file):
        self.name = name
        self.num = num
        self.input_file = input_file
        self.students = []
        #so far it's just an empty list

    #add methods that read in the students from a file
    #parse it for info you need
    def parse():
        #parse self.input_file for info you need
        pass

class Classes(object):
    def __init__(self, input_file):
        self.input_file = input_file
        self.all_classes = []
    #this parse function should read in from a file
    #of all classes, and instantiate a new Class
    #object and put them in self.all_classes
    #this is the class that enables you to select
    #which Class you want, and Class object should
    #have methods for calculating average, per student
    #grade etc....
    def parse():
        #parse the file to fill self.all_classes
        pass


classes = Classes(input_file="all_classes.txt")
#this should return a Classes object named classes
#that object should contain a list of all Class objects
#those objects should have methods to retrieve avg grade etc...

然后，在空闲的时候，你可能会有这样的东西：

>>> classes.all_classes
[]
>>> classes.input_file
'all_classes.txt'
>>> specific_class = classes.all_classes["specific_class_identifier"]
>>> specific_class["specific_quiz_identifier"].avgGrade()

我建议你在实际编程之前计划好你到底想要达到什么目标。尤其是你保存信息的数据文件。也就是说，它们可以像csv分隔的文件一样简单：all_classes.txt

class1a,"class1a.txt"

specific_class.txt

"Student Student","quiz1: grade","quiz2: grade"
"Student Student","quiz1: grade","quiz2: grade"

或者是复杂的文件，比如JSON等等.