更新基於搜索追加的Python列表

Question

我想創建一個非常基本的記分板系統。要從文件讀入列表中的分數。如果名稱存在，則將使用更多分數更新列表（追加）。如果名稱不存在，則創建新行。我認爲它的附加新分數列表不起作用。任何幫助表示讚賞 - 學習。

message="" 

#ask for name and score 
name = input("Please enter the name you wish to add") 
score = input("Please enter the high score") 

#open the highscores line and read in all the lines to a list called ScoresList. 
# Then close the file. 
scoresFile = open("highscores.txt","r") 
ScoresList = scoresFile.readlines() 
scoresFile.close() 

#for each line in the ScoresList list 
for i in range(0, len(ScoresList)): 

    #check to see if the name is in the line 
    if name in ScoresList[i]: 

     #append new score to list 
     tempscore= ScoresList[i] 
     ScoresList[i]=tempscore.append(score) 
     message="Updated" 

     #write the scores back to the file. Overwrite with the new list 
     scoresFile = open("highscores.txt","w") 
     for line in ScoresList: 
      scoresFile.write(line + "\n") 
     scoresFile.close() 

    else: 
     message = "Not updated" 

if message=="": 
     scoresFile = open("highscores.txt","a") 
     scoresFile.write(name + str(score)+"\n") 
     scoresFile.close() 

Answer 1

ScoresList[i]=tempscore.append(score)使得ScoresList[i]等於None作爲追加是一個在適當位置的方法。因此，您將所有None's存儲在您的ScoresList中。

如果你想得分添加到名稱：

name = input("Enter your name").rstrip() # make "foo" == "foo " 
score = input("Enter your score") 
with open("highscores.txt","a+") as f: # a+ will allow us to read and will also create the file if it does not exist 
    scores_list = f.readlines() 
    # if scores_list is empty this is our first run 
    if not scores_list: 
     f.write("{} {}\n".format(name, score)) 
    else: 
     # else check for name and update score 
     new_names = [] 
     for ind, line in enumerate(scores_list): 
      # if name exists update name and score 
      if name in line.split(): 
       scores_list[ind] = "{} {}\n".format(name, score) 
       break # break so we don't add existing name to new names 
     else: 
      # else store new name and score 
      new_names.append("{} {}\n".format(name, score)) 


     # all scores updated so open and overwrite 
     with open("highscores.txt","w") as scores_file: 
      scores_file.writelines(scores_list + new_names) 

您還你已經在列表中的所有得分，從而打開該文件只有一次外循環時ScoresList更新並覆蓋代替每次重複打開。

如果你想添加的，而不是覆蓋分數增加分數線，而不是名稱的新成績：

scores_list[ind] = "{} {}\n".format(line.rstrip(), score) 

如果你想用逗號分隔每個新的得分追加到exisiting名稱：

with open("highscores.txt","a+") as f: # a+ will allow us to read and will also create the file if it does not exist 
    scores_list = f.readlines() 
    # if scores_list is empty this is our first run 
    if not scores_list: 
     f.write("{},{}\n".format(name, score)) 
    else: 
     # else check for name and update score 
     new_names = [] 
     for ind, line in enumerate(scores_list): 
      # if name exists update name and score 
      if name.rstrip() in line.split(","): 
       scores_list[ind] = "{},{}\n".format(line.rstrip(), score) 
       break # break so we don't add existing name to new names 
     else: 
      # else store new name and score 
      new_names.append("{},{}\n".format(name, score)) 


     # all scores updated so open and overwrite 
     with open("highscores.txt","w") as scores_file: 
      scores_file.writelines(scores_list + new_names)