On Jul 10, 4:17 pm, Dave Angel <da...@ieee.org> wrote: > vox wrote: > > On Jul 10, 2:04 pm, Peter Otten <__pete...@web.de> wrote: > > >> You are probably misinterpreting len(s3). s3 contains lines occuring in > >> "file1" but not in "file2". Duplicate lines are only counted once, and the > >> order doesn't matter. > > >> So there are 119 lines that occur at least once in "file2", but not in > >> "file1". > > >> If that is not what you want you have to tell us what exactly you are > >> looking for. > > >> Peter > > > Hi, > > Thanks for the answer. > > > I am looking for a script that compares file1 and file2, for each line > > in file1, check if line is present in file2. If the line from file1 is > > not present in file2, print that line/write it to file3, because I > > have to know what lines to add to file2. > > > BR, > > Andy > > There's no more detail in that response. To the level of detail you > provide, the program works perfectly. Just loop through the set and > write the members to the file. > > But you have some unspecified assumptions: > 1) order doesn't matter > 2) duplicates are impossible in the input file, or at least not > meaningful. So the correct output file could very well be smaller than > either of the input files. > > And a few others that might matter: > 3) the two files are both text files, with identical line endings > matching your OS default > 4) the two files are ASCII, or at least 8 bit encoded, using the > same encoding (such as both UTF-8) > 5) the last line of each file DOES have a trailing newline sequence
Thanks all for the input! I have guess I have to think it through a couple times more. :) BR, Andy -- http://mail.python.org/mailman/listinfo/python-list