平均来自用户的输入

Question

第四项作业涉及编写一个 Python 程序来计算一组五名学生的平均测验成绩。您的程序应包含五个名称的列表。使用 for 循环，它应该连续提示用户输入五个学生中每个学生的测验成绩。每个提示应包括要输入其测验成绩的学生的姓名。它应该计算并显示这五个等级和最高等级的平均值。你应该决定这五个学生的名字。

这是我的任务，下面是我目前的任务。

# This program will compute the average quiz grade for 5 students
print ("Hello, this program is designed to compute the average quiz grades for the following students: Clark, Nicole, Kiran, Alex, and Erik")

students = ["Clark", "Nicole", "Kiran", "Alex", "Erik"]
for student in students:
    print (student, ", What was your quiz grade?")
    grades = eval(input("My grade is: "))

程序会询问每个学生的成绩。但是，我需要以某种方式将这些数字相加，以便之后我可以将它们划分为平均值。任何人都可以建议我解决此问题的正确途径吗？

Answer 1

是的。首先，我已经为您修复并格式化了您的代码。

# This program will compute the average quiz grade for 5 students
print("Hello, this program is designed to compute the average quiz grades for the following students: Clark, Nicole, Kiran, Alex, and Erik")

students = ["Clark", "Nicole", "Kiran", "Alex", "Erik"]

for student in students:
    print(student, ", What was your quiz grade?")
    grades = input("My grade is: ")

到目前为止，您可以向每个学生询问成绩。一旦他们告诉您，您应该将其存储在内存中。一个简单的方法是使用一个列表（我假设你还没有学过字典）。

您可以在询问成绩之前创建一个新列表，然后将用户输入的每个新成绩添加到列表末尾。

# This program will compute the average quiz grade for 5 students
print("Hello, this program is designed to compute the average quiz grades for the following students: Clark, Nicole, Kiran, Alex, and Erik")

students = ["Clark", "Nicole", "Kiran", "Alex", "Erik"]

grades = []  # create an empty list to store the grades in

for student in students:
    print(student, ", What was your quiz grade?")
    grade = input("My grade is: ")
    grades.append(int(grade))  # convert the grade to an integer number, then add it to the list

print("Here are the grades you entered: ", grades)

现在，我们需要计算列表的平均值。回顾初等数学，一组数字的平均值是数字的总和除以数字的个数。

在 Python 中，您可以使用内置函数 sum() 来计算数字的总和。您可以使用内置函数len() 来获取列表中的元素个数。

现在，您只需将总和除以长度即可。

average = sum(grades) / len(grades)
print("The average is:", average)

现在，为了获得最高等级，您可以使用内置函数max()。这将找到并返回数组中的最大数字。

你可以这样使用它。

highest = max(grades)
print("The highest grade is:", highest)

如果您想要组合代码：

# This program will compute the average quiz grade for 5 students
print("Hello, this program is designed to compute the average quiz grades for the following students: Clark, Nicole, Kiran, Alex, and Erik")

students = ["Clark", "Nicole", "Kiran", "Alex", "Erik"]

grades = []  # create an empty list to store the grades in

for student in students:
    print(student, ", What was your quiz grade?")
    grade = input("My grade is: ")
    grades.append(int(grade))  # convert the grade to an integer number, then add it to the list

print("Here are the grades you entered: ", grades)

average = sum(grades) / len(grades)
print("The average is:", average)

highest = max(grades)
print("The highest grade is:", highest)