code: def path_total_size(path_: str) -> int:
      
      if path.isfile(path_):
          return path.getsize(path_)
      total_size = 0
      for root_dir, _, files in os.walk(path_):
          for file_ in files:
              total_size += path.getsize(path.join(root_dir, file_))
      return total_size
docs: Compute total size of the given file/dir.