Question

当分数大于3时，我的代码试图删除文本文件中最早的分数。这是文本文件：

humzah:0:6:5
ikrah:8:6:4

这是我的代码：

if userclass=="1": #if userclass is equal to 1
   with open ("Class1scores.txt", "r") as dataforclass1:#open the class 1 file as
#data for class 1 in read plus mode 
        lines = dataforclass1.read().splitlines() #lines is equal to each line on
        #the file (list).
        for lineno1, line in enumerate(lines): #for the line number
            usertaken=input("Have you taken this quiz before, yes or no") #first ask if the user
            #has done this quiz before
            while True: #this states that while it is true
                      if usertaken=="yes": #if the user says yes continue the script
                         break
                      if usertaken=="no": #if the user says no continue the script
                         break
                      else:
                           print("That is not a valid answer! yes or no")#if the user
                           continue
            if usertaken=="yes": #if they have then find the line and add to it
               if line.startswith(username): 
                  print("was found on line", lineno1) #tells the user what lines their name is on
                  lines[lineno1] += ":" + str(score)
                  break
            else:
                lines.append(username + ":" + str(score)) #if they have not add to
                #a new line
                break
   data = "\n".join(lines) + "\n" #data is the list plus indents (\n means new
  #line)
   with open("Class1scores.txt", "w") as file: #opens the file in write mode
        file.write(data) #this writes in to the file
        print(data)

with open('Class1scores.txt','r') as class1file:#with the text file
#as class1file
    lines = []#this creates an empty list
    for x, line in enumerate(class1file):#to find x read the lines
        if lineno1==x:
          class1_list = line.split(':')#split the text file by :
        if len(class1_list) > 4:#if theres more than 4 values
           del class1_list[1]#delete the first score
           line = ':'.join(class1_list)#the line is equal to the
           #data with : as the seperator
        lines.append(line)#append this to the list
    with open("Class1scores.txt",'w') as writefile:
        writefile.write(''.join(lines))

对于1级，它只是循环问题＆＃34;你在＃34;之前进行了这个测验吗？对于其他类，复制和粘贴相同的代码，它表示＆＃34; lineno1未定义＆＃34;。有什么帮助吗？

Answer 1

lineno1仅在if-block中定义，其中userclass等于1.在所有其他情况下，变量永远不会被定义，因此会抛出错误。
如果在代码的第一行定义lineno1，它将在第一个if块中被覆盖，但你也可以在第二个if块中使用。

为什么这个coden告诉我lineno1不存在？

1 个答案: