How to write the condition for deleting multiple lines?

Lky · Jul-10-2022, 05:36 AM

Does anyone know how to delete lines in txt file according to user input without using any list or dictionary?

For example content inside txt file:
Question 1 Which is correct?
A. X
B. XX
C. XXX
D. XXXX
Question 2 Which is wrong?
A. X
B. XX
C. XXX
D. XXXX
Question 3 Which is True?
A. X
B. XX
C. XXX
D. XXXX

When user choose to delete question 2, the file will updated and the output will become like this:
Question 1 Which is correct?
A. X
B. XX
C. XXX
D. XXXX
Question 3 Which is True?
A. X
B. XX
C. XXX
D. XXXX

I'm not sure how to write the condition for deleting the A/B/C/D option together with the question entered by user.

Here is my code:

        
              import os
def main():
     
    import os
 
    answer = input("Enter question to delete:")
    with open("testing.txt", "r") as read:
        with open("temp.txt", "w") as output:
            # iterate all lines from file
            for line in read:
                # if text matches then don't write it
                if line.strip("\n") != answer:
                    output.write(line)
                         
    read.close()
    output.close()
    # replace file with original name
    os.replace('temp.txt', 'testing.txt')
 
main()

jcrubaugh45 · Jul-10-2022, 02:25 PM

(Jul-10-2022, 05:36 AM)Lky Wrote: Does anyone know how to delete lines in txt file according to user input without using any list or dictionary?

For example content inside txt file:
Question 1 Which is correct?
A. X
B. XX
C. XXX
D. XXXX
Question 2 Which is wrong?
A. X
B. XX
C. XXX
D. XXXX
Question 3 Which is True?
A. X
B. XX
C. XXX
D. XXXX

When user choose to delete question 2, the file will updated and the output will become like this:
Question 1 Which is correct?
A. X
B. XX
C. XXX
D. XXXX
Question 3 Which is True?
A. X
B. XX
C. XXX
D. XXXX

I'm not sure how to write the condition for deleting the A/B/C/D option together with the question entered by user.

Here is my code:

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import os
def main():

    import os

    answer = input("Enter question to delete:")
    with open("testing.txt", "r") as read:
        with open("temp.txt", "w") as output:
            # iterate all lines from file
            for line in read:
                # if text matches then don't write it
                if line.strip("\n") != answer:
                    output.write(line)


    read.close()
    output.close()
    # replace file with original name
    os.replace('temp.txt', 'testing.txt')

main()

What are you expecting the user to input ? the number of the question ? or the matching text of the full question they want to remove ?

Lky · Jul-10-2022, 02:27 PM

(Jul-10-2022, 02:25 PM)jcrubaugh45 Wrote:
(Jul-10-2022, 05:36 AM)Lky Wrote: Does anyone know how to delete lines in txt file according to user input without using any list or dictionary?

For example content inside txt file:
Question 1 Which is correct?
A. X
B. XX
C. XXX
D. XXXX
Question 2 Which is wrong?
A. X
B. XX
C. XXX
D. XXXX
Question 3 Which is True?
A. X
B. XX
C. XXX
D. XXXX

When user choose to delete question 2, the file will updated and the output will become like this:
Question 1 Which is correct?
A. X
B. XX
C. XXX
D. XXXX
Question 3 Which is True?
A. X
B. XX
C. XXX
D. XXXX

I'm not sure how to write the condition for deleting the A/B/C/D option together with the question entered by user.

Here is my code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21

import os
def main():

    import os

    answer = input("Enter question to delete:")
    with open("testing.txt", "r") as read:
        with open("temp.txt", "w") as output:
            # iterate all lines from file
            for line in read:
                # if text matches then don't write it
                if line.strip("\n") != answer:
                    output.write(line)


    read.close()
    output.close()
    # replace file with original name
    os.replace('temp.txt', 'testing.txt')

main()

What are you expecting the user to input ? the number of the question ? or the matching text of the full question they want to remove ?

User have to enter full questions

Lky · Jul-10-2022, 02:28 PM

(Jul-10-2022, 02:27 PM)Lky Wrote:
(Jul-10-2022, 02:25 PM)jcrubaugh45 Wrote: What are you expecting the user to input ? the number of the question ? or the matching text of the full question they want to remove ?
User have to enter full questions

        
              import os
def main():
     
    list3=[]
    ans = input("Delete:")
    with open("testing.txt", "r") as read:
        #file_content = read.readlines()
     
        with open("temp.txt", "w") as output:
        # iterate all lines from file
             
            for line in read:
                if line.strip() == ans:  # Or whatever test is needed
                    break
                    # Reads text until the end of the block:
            for line in read:  # This keeps reading the file
                if line[0].isupper():
                    break
                #print(line)
                strip_lines=line.strip()
                list1=strip_lines.split("\n")
                 
                list3.append(list1)
             
            for line in read:
                currentline = line.strip('\n')
                if line not in list3:
                    output.write(line)
                     
    read.close()
    output.close()
     
    os.replace('temp.txt', 'testing.txt')
main()

Here is my latest code. (Assuming the option is in small letter (a./b./c./d.)

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How to write the condition for deleting multiple lines?

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