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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 _unset_magic_constants(self):
 """ Removes magic constants from current replace list. """

        if '__FILE__' in self._replace:
            del self._replace['__FILE__']

        if '__ROUTINE__' in self._replace:
            del self._replace['__ROUTINE__']

        if '__DIR__' in self._replace:
            del self._replace['__DIR__']

        if '__LINE__' in self._replace:
            del self._replace['__LINE__']