用python計算學生/班級平均值

Question

python 3.3.3

我試圖寫一個上課的程序，我迷路了。 這是我需要做的。

我需要根據輸入的成績計算每個學生的平均成績。 我需要計算平均成績。 如果學生輸入的分數是-1，則停止輸入分數。 需要在每個學生年級時打印一條消息。 學生成績應顯示數字成績和字母成績。 該消息將基於學生的字母等級。

我如何收集和存儲學生的姓名和考試成績。 這樣我就可以一次全部輸出到顯示學生姓名的位置。 他們的數字平均值，基於該平均值的字母等級以及基於他們收到的字母等級的陳述 ？

到目前為止我的繼承人代碼：

def main():
    another_student = 'y'
    while another_student == 'y' or another_student == 'Y':
        student_average()
        print()
        another_student = input('do you have another student to enter (y/n) ? ')
    while another_student == 'n' or another_student == 'N':
        student_average_list()
        class_average()
        break

def student_average():
    total = 0.0
    print()
    student_name = input('what is the students name? ')
    print()
    print()
    print(student_name)
    print('-------------------')
    number_of_tests = int(input('please enter the number of tests : '))
    for test_num in range(number_of_tests):
        print('test number', test_num + 1, end='')
        score = float(input(': '))
        total += score
    student_average = total / number_of_tests
    print ()
    print(student_name,"'s average is : ",student_average, sep='')

def student_average_list():
    print ('kahdjskh')

def class_average():
    print ('alsjd')

main()

Answer 1

我認為這已經接近您基本上要尋找的東西。 它定義了一個Student類，以使數據存儲和處理更易於管理。

class Student(object):
    def __init__(self, name):
        self.name, self.grades = name, []

    def append_grade(self, grade):
        self.grades.append(grade)

    def average(self):
        return sum(self.grades) / len(self.grades)

    def letter_grade(self):
        average = self.average()
        for value, grade in (90, "A"), (80, "B"), (70, "C"), (60, "D"):
            if average >= value:
                return grade
        else:
            return "F"

def main():
    print()
    print('Collecting class student information')
    a_class = []  # "class" by itself is a reserved word in Python, avoid using
    while True:
        print()
        print('{} students in class so far'.format(len(a_class)))
        another_student = input('Do you have another student to enter (y/n) ? ')
        if another_student[0].lower() != 'y':
            break
        print()
        student_name = input('What is the student\'s name? ')
        a_class.append(Student(student_name))
        print()
        print('student :', student_name)
        print('-------------------')
        number_of_tests = int(input('Please enter the number of tests : '))
        for test_num in range(1, number_of_tests+1):
            print('test number {}'.format(test_num), end='')
            score = float(input(' : '))
            if score < 0:  # stop early?
                break
            a_class[-1].append_grade(score) # append to last student added

    print_report(a_class)

def print_report(a_class):
    print()
    print('Class Report')
    print()
    for student in sorted(a_class, key=lambda s: s.name):
        print('student: {:20s} average test score: {:3.2f}  grade: {}'.format(
            student.name, student.average(), student.letter_grade()))
    print()
    print('The class average is {:.2f}'.format(class_average(a_class)))

def class_average(a_class):
    return sum(student.average() for student in a_class) / len(a_class)

main()

Answer 2

您需要保留整個班級的成績單。 student_average函數正在執行太多操作。 也許使函數get_student_marks僅僅返回學生分數列表。 您需要一個average函數來計算列表的平均值，您可以將其用於學生平均值和班級平均值。 祝好運！