code: def touch(self, mode=0o666, exist_ok=True):
          
          if self._closed:
              self._raise_closed()
          if exist_ok:
              # First try to bump modification time
              # Implementation note: GNU touch uses the UTIME_NOW option of
              # the utimensat() / futimens() functions.
              try:
                  self._accessor.utime(self, None)
              except OSError:
                  # Avoid exception chaining
                  pass
              else:
                  return
          flags = os.O_CREAT | os.O_WRONLY
          if not exist_ok:
              flags |= os.O_EXCL
          fd = self._raw_open(flags, mode)
          os.close(fd)
docs: Create this file with the given access mode, if it doesn't exist.