python - 如何在Python中打印字典键值的平均值？

Question

Python 问题:

我一直在尝试让 Python 3 打印我的字典的平均值、sum/len。

我一直在研究如何在堆栈溢出中查找字典中值的平均值的方法，但每次我尝试使用字典中值的键来执行此操作时，我都会遇到错误。我能够让 len 工作，但除以它不起作用。

*TL:DR 如何打印字典中值的平均值？在注释行上。

我已经清理了我的代码并留下了一个空行来放入正确的代码。

import operator
"Dictionary"
time = {
        'Kristian':19,
        'Alistair':27,
        'Chris':900,
        'Maxi':50, 
        'Jack':15,
        'Milk Man':1
        }
print(time)
print ("-------------------------------")
"Printing the List"
for xyz in time:
    print ("-------------------------------")
    print("\nStudent Name: ", xyz,"\n Time: ", time[xyz],"seconds\n")

"Printing the Results"
def results():
    print ("-------------------------------")
    print("\nThe Fastest Time is: ",(time[min(time, key=time.get)]),"seconds")
    print("\nThe Slowest Time is: ",(time[max(time, key=time.get)]),"seconds")
    print("\nNo. of Competitors: ",len(time))
"//////////Here is where I want to print the mean score\\\\\\\\\\"

results()

"Adding to the Results"
def question():
    person = input("\nPlease enter the student's name: ")
    secs = int(input("Please enter the student's time in seconds: "))
    print("The results you have added are:")
    print("\nStudent Name: ", person,"\n Time: ", secs,"seconds\n")
    sure = input("Are you sure? ").lower()
    if sure in ("no", "n", "nope"):
        question()
    else:
        time.update({person:secs})
        print("Student has been added successfully.")
        results()

"Running the loop"
question()

Answer 1

你指的是字典的值，而不是键，对吧？那么这将起作用(使用 statistics.mean ):

from statistics import mean
time = {
        'K':19,
        'Al':27,
        'Chris':900,
        'Max':50,
        'Jack':15,
        'Milk Man':1
        }

print(mean(time.values()))  # 168.66666666666666

使用dict.values您还可以轻松获得更简单的最大值:

print(max(dct.values()))

也许时间不是字典的最佳名称；标准库中有一个名为time的模块。如果您将其导入到同一个文件中，您将覆盖该模块。