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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 attributes(self):
 if 'id' in self.node.attrib: yield PlaceholderAttribute('id', self.node.attrib['id']) if 'tei-tag' in self.node.attrib: yield PlaceholderAttribute('tei-tag', self.node.attrib['tei-tag']) """Contain attributes applicable to this element"""

        for attributes in self.node.iterchildren('attributes'):
            for attribute in self.__iter_attributes__(attributes):
                yield attribute