如何从引用行中正确替换文本中的行

Question

我已经编写了一些代码来接收用户，并使用文本文件为他们分配任务。我遇到的问题是，用户输入了一个要编辑的任务编号，但我不知道如何替换输入的任务编号上方12行的文本行，这将替换用户名。如果文本文件中有两个任务，我需要能够使用任务编号行作为参考点，然后将上面的第12行替换为新的用户名。所以我基本上需要为每个任务替换用户输入上方的第12行。我已经写了一些代码来替换名称，但它会擦除我的整个文本文件。

文本文件示例：(tasks.txt(

分配给任务的用户：

插孔

任务标题：

飞行

任务描述：

飞往月球

任务截止日期：

2020-02-20分配日期：

2020-02-18

任务完成：

无

任务编号：

1

到目前为止，受影响区块的代码是：

with open('tasks.txt') as xxaz:
main2 = "Task number:" + "n" + str(review)
aa = xxaz.read()
if main2 in aa:
print(str(main2) + "n")
edit = input("Enter ""1"" to edit the user assigned to task, ""2"" to change the due date or ""3"" to change the completion status.n")
if edit == "1":
new_name = input("Please enter a new user name")
lines = open('tasks.txt').read().splitlines()
lines[2] = new_name
open('tasks.txt','w').write

Answer 1

这就是您想要的吗？就我个人而言，我会为此收养熊猫。但这与你的方法是一致的。

样本输入文件：

User assigned to task:
jack
Task Title :
Fly
Task Description:
Fly to the moon
Task Due Date:
2020-02-20
Date Assigned:
2020-02-18
Task Completed:
No
Task number:
1
User assigned to task:
jill
Task Title :
Walk
Task Description:
Walk to the moon
Task Due Date:
2020-03-20
Date Assigned:
2020-02-19
Task Completed:
No
Task number:
2
User assigned to task:
Brenda
Task Title :
Run
Task Description:
Run to the moon
Task Due Date:
2020-03-16
Date Assigned:
2020-04-19
Task Completed:
Yes
Task number:
3

代码

#Take the user inputs
review = input('Enter the task number you want to modify: ')
field = input('''Enter:
1: To change the user assigned to task.
2: To change the due date.
3: To change the completion status
''')
value = input('Enter the value: ')
#Create a function which returns the field name as per the number provided by the user
def switchdic(num):
dic = {'1':'User assigned to task:',
'2':'Task Due Date:',
'3':'Task Completed:'
}
return dic.get(num,'Invalid entry')
#code block to read and write the modified content to a new file
with open('user_task_data.txt') as fh,open('new_task_data.txt','w') as fw :
lines = fh.readlines()
for line in lines:
#Skip the lines if they do not match the 'Task number:' as the previous line
if (lines[lines.index(line)-1].strip() != "Task number:"):
continue
data = lines[lines.index(line)-13:lines.index(line)+1] #Assign the whole block of the given task number to variable data
#Modify the values as per the given input and write to the new file
if review == str(line.strip()):
data[lines.index(switchdic(field)+"n")+1] = value+"n"
fw.write(''.join(data))
#Write the values as they are if they are not connected to the input task number
else:
fw.write(''.join(data)) 
print('The file is modified and new file is"new_task_data.txt" ')

O/p

Enter the task number you want to modify: 3
Enter:
1: To change the user assigned to task.
2: To change the due date.
3: To change the completion status
3
Enter the value: No
The file is modified and new file is"new_task_data.txt" 

Answer 2

如果您想继续使用相同的方法，下面是解决方案：

Tasks.txt:

User assigned to task:
jack
Task Title :
Fly
Task Description:
Fly to the moon
Task Due Date:
2020-02-20 Date Assigned:
2020-02-18
Task Completed:
No
Task number:
1
User assigned to task:
qwe
Task Title :
Fly
Task Description:
Fly to the moon
Task Due Date:
2020-02-20 Date Assigned:
2020-02-18
Task Completed:
No
Task number:
2

代码：-

with open(r"C:UsersxyzDesktopTasks.txt","r+") as xxaz:
main2 = "Task number:" + "n" + str(2)
if main2 in xxaz.read():
edit = input("Enter ""1"" to edit the user assigned to task, ""2"" to change the due date or ""3"" to change the completion status.")
if edit == "1":
xxaz.seek(0)
taskLines = xxaz.readlines()
new_name = input("Please enter a new user name: ")
for i in taskLines:
if i == ('Task number:n'):
indexVal = taskLines.index('Task number:n')
taskLines.insert(indexVal,taskLines[indexVal]+taskLines[indexVal+1])
taskLines.pop(indexVal+1)
taskLines.pop(indexVal+1)
indexVal = taskLines.index(main2.strip())
taskLines.pop(indexVal-10)
taskLines.insert(indexVal-10,new_name+'n')
xxaz.seek(0)
xxaz.writelines(taskLines)