通过包含特定字符串从文件中删除行在 python 中不起作用

Question

I'm trying to delete each line which contains "annote = {" but my code is not working.

I have a file stored in a variable myFile and I want to go through every line of this file and delete every line which contains the string annote.

this is basically my code:

    print(myFile.read())      //prints myFile
    myFile.seek(0)

    for lines in myFile:
        if b"annote = {" in lines:
            lines = lines.replace(b'.', b'')

    myFile.seek(0)
    print(myFile.read())    //this prints the exact same as the print method above so annote lines 
                            //haven't been removed from this file

I have no idea why annote lines doesn't get removed. There is probably anything wrong with the replace method because it always is inside the if request but nothing happens with annote lines. I've also tried lines.replace(b'.', b'') instead of lines = lines.replace(b'.', b'') but nothing happened.

Hope anyone can help me with this problem

Answer 1

This will do it for you.

f.readlines() returns a list of text lines

Then you check for the lines that do not contain the things you do not want

Then you write them to a separate new file.

    f2 = open('newtextfile.txt', 'w')

    with open('text_remove_line.txt', 'r') as f:
       for line in f.readlines():
           if 'annote = {' not in line:
               f2.write(line)
    f2.close()

Answer 2

This should work:

with open('input.txt') as fin :
    lines = fin.read().split('\n')  # read the text, split into the lines

with open('output.txt', 'w') as fout :
    # write out only the lines that does not contain the text 'annote = {'
    fout.write( '\n'.join( [i for i in lines if i.find('annote = {') == -1] ))