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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_space(self):
 # type: () -> Optional[Text] """Back out a namespace from full name."""

        if self._full is None:
            return None

        if self._full.find('.') > 0:
            return self._full.rsplit(".", 1)[0]
        else:
            return ""