Remove lines that contain certain string

Question

I\'m trying to read a text from a text file, read lines, delete lines that contain specific string (in this case \'bad\' and \'naughty\'). The code I wrote goes like this:

Answer 1

You could simply not include the line into the new file instead of doing replace.

for line in infile :
     if 'bad' not in line and 'naughty' not in line:
            newopen.write(line)