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).

Owing to the rise in energy costs, many homeowners are asking, “Are solar panels worth it?”. While it depends on a range of factors, the answer, in most instances, is yes. The growing interest has ...