code: def save(self, path, compressed=True, exist_ok=False):
          
          path = os.path.expandvars(os.path.expanduser(path))
          if os.path.isfile(path) and not exist_ok:
              raise OSError(17, os.strerror(17), path)
  
          if os.path.isdir(path):
              path = os.path.join(path, "out.gdg")
  
          if compressed:
              bytes_written = cgaddag.gdg_save_compressed(self.gdg, path.encode("ascii"))
          else:
              bytes_written = cgaddag.gdg_save(self.gdg, path.encode("ascii"))
  
          if bytes_written == -1:
              errno = ctypes.c_int.in_dll(ctypes.pythonapi, "errno").value
              raise OSError(errno, os.strerror(errno), path)
  
          return bytes_written
docs: Save the GADDAG to file.
  
          Args:
              path: path to save the GADDAG to.
              compressed: compress the saved GADDAG using gzip.
              exist_ok: overwrite existing file at `path`.