code: def get_all_files(folder):
      
      for path, dirlist, filelist in os.walk(folder):
          for fn in filelist:
              yield op.join(path, fn)
docs: Generator that loops through all absolute paths of the files within folder
  
      Parameters
      ----------
      folder: str
      Root folder start point for recursive search.
  
      Yields
      ------
      fpath: str
      Absolute path of one file in the folders