code: def format(self, version=None, wipe=None):
          
          if hasattr(self, "_format"):
              args = "version={0!r}, wipe={1!r}"
              args = args.format(version, wipe)
              log.debug("format({0})".format(args))
              status = self._format(version, wipe)
              if status is True:
                  self._ndef = None
              return status
          else:
              log.debug("this tag can not be formatted with nfcpy")
              return None
docs: Format the tag to make it NDEF compatible or erase content.
  
          The :meth:`format` method is highly dependent on the tag type,
          product and present status, for example a tag that has been
          made read-only with lock bits can no longer be formatted or
          erased.
  
          :meth:`format` creates the management information defined by
          the NFC Forum to describes the NDEF data area on the tag, this
          is also called NDEF mapping. The mapping may differ between
          versions of the tag specifications, the mapping to apply can
          be specified with the *version* argument as an 8-bit integer
          composed of a major version number in the most significant 4
          bit and the minor version number in the least significant 4
          bit. If *version* is not specified then the highest possible
          mapping version is used.
  
          If formatting of the tag is possible, the default behavior of
          :meth:`format` is to update only the management information
          required to make the tag appear as NDEF compatible and empty,
          previously existing data could still be read. If existing data
          shall be overwritten, the *wipe* argument can be set to an
          8-bit integer that will be written to all available bytes.
  
          The :meth:`format` method returns :const:`True` if formatting
          was successful, :const:`False` if it failed for some reason,
          or :const:`None` if the present tag can not be formatted
          either because the tag does not support formatting or it is
          not implemented in nfcpy.