如何我可以從保存爲文本文件

Question

我不得不採取從文本文件信息的格式的文件得到的平均值：

Dom : 9 
Eathan : 0 
Harry : 8 
Jack : 7 
Jake : 0 
James : 1 
Jeffin : 1 
Louis : 8 
Sam : 0 
Tom : 3 
William : 0 

我需要從這個文本文件中把分數保存作爲int（因爲它們是字符串）並計算出平均值並打印出來。

import random 
import operator 

def randomCalc(): 
    ops = {'+':operator.add, 
      '-':operator.sub, 
      '*':operator.mul, 
      '/':operator.truediv} 
    num1 = random.randint(0,12) 
    num2 = random.randint(1,10) 
    op = random.choice(list(ops.keys())) 
    answer = ops.get(op)(num1,num2) 
    print('What is {} {} {}?\n'.format(num1, op, num2)) 
    return answer 

def askQuestion(): 
    answer = randomCalc() 
    while True: 
     try: 
     guess = float(input())#The Answer the user inputs to the question asked 
     except ValueError: #When anything but a interger is inputted. 
     print ("That is not a valid answer") 
     continue #Dosen't print Invalid Code Error 
     else: 
     break 
    return guess == answer 

def quiz(): 
    print('Welcome. This is a 10 question math quiz\n') 
    score = 0 
    for i in range(10): 
     correct = askQuestion() 
     if correct: 
      score += 1 
      print('Correct!\n') 
     else: 
      print('Incorrect!\n') 
    print ("\nYour score was {}/10 Well done".format(score)) 
    print ("\nWhat is your name") 
    name = str(input()) 
    class_name = input("\nWhich class do you wish to input results for? ") 
    class_name = class_name + ".dat" #adds '.txt' to the end of the file so it can be used to create a file under the name a user specifies 

    file = open(class_name, "a") #opens the file in 'append' mode so you don't delete all the information 
    name = (name) 
    file.write(str(name + " : ")) #writes the information to the file 
    file.write(str(score)) 
    file.write('\n') 
    file.close() 
    return score 

quiz() 

viewscore_alpha = str(input("\nWould you like to view the score`s of players alphabeticaly: Yes or No")) 
if viewscore_alpha == "yes".lower(): 
    class_name = input("\nWhich class do you wish to View results for? ") 
    class_name = class_name + ".dat" 
    with open(class_name) as file: # use with to open files as it closes them automatically 
     file.seek(0) # go back to start of file 
     for line in f: # print each name 
      print(line) 
     file.seek(0) # go back to start again 
     lines = sorted(file.readlines()) # sort the names 
     with open(class_name, "w") as file_save: # write names in sorted order 
      for line in lines: 
       file_save.write(line) 
     file.close() 
     file_save.close90 
elif viewscore_average == "no".lower() : 
    viewscore_average = str(input("\nWould you like to view the score`s of classes avrages?: Yes or No")) 
    if viewscore_average == "yes".lower(): 
     chars = set("") 


    else: 
     viewscore_higest = str(input("\nWould you like to view the score`s of players alphabeticaly: Yes or No")) 
     if viewscore_higest == "yes".lower(): 

這就是我所有的，我卡住了。

Answer 1

將其分解爲邏輯步驟。

1. 打開該文件（並初始化幾個變量，我們以後將使用）

   running_total = 0 
   num_scores = 0 
   with open("path/to/file.txt") as scoresfile: 
   

2. 閱讀每一行

   for line in scoresfile: 
   

3. 分裂冒號每一行

    splitline = line.split(":") 
   

4. 分數轉換爲int

    score = int(splitline[1]) # splitline[1] is the score 
   

5. 比分添加到運行總量

    running_total += score 
   

6. 增量我們讀到的平均

    num_scores += 1 
   

劃分的行數

7. 讓for循環完成，然後做你的數學找到平均值

   average = running_total/num_scores 
   

您可以將其中的幾個步驟，通過列表理解的魔法拿出一些更簡潔，看起來像：

with open('path/to/file.txt') as scoresfile: 
    scores = [int(score) for line in scoresfile for 
       _, score in line.split(":")] 
average = sum(scores)/len(scores)