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).

Still, the engineers at Audemars Piguet are clearly not Luddites: What, they wondered, could be done to lend a chronograph the tactile feel of a smartphone? Certainly that would go a long way toward ...