I'm looking for a way to optimize some programs I've written. Basically the problem is that I'm manipulating a long list composed entirely of 1's and 0's. Is there a module/extension that allows me to ...

os.path.join (folder, filename) ensures the path is correct for the system. On Windows, it uses backslashes (reports\summary.txt); on Linux and macOS it uses forward slashes (reports/summary.txt).