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).

Oct. 3 marks 30 years since OJ Simpson was acquitted in the double homicide. The tumultuous life of O.J. Simpson -- from football Hall of Famer to movie star to double murder suspect -- has captivated ...