Pylint - distinguish new errors from old ones

Two basic approaches. Fix errors as they appear so that there will be no old ones. Or, if you have no intention of fixing certain types of lint errors, tell lint to stop reporting them.

If you have a lot of files it would be a good idea to get a lint report for each file separately, commit the lint reports to revision control like svn, and then use the revision control systems diff utility to separate new lint errors from older pre-existing ones. The reason for seperate reports for each .py file is to make it easier to read the diff output.

If you are on Linux, vim -d oldfile newfile is a nice way to read diff. If you are on Windows then just use the diff capability built into Tortoise SVN.