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).

The Trump administration says it has a deal to save the popular video app, which by law must find a new, non-Chinese owner or face a ban in the United States. By Sapna Maheshwari Amanda Holpuch and ...