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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 train(self, record):
 """ Incrementally updates the tree with the given sample record. """

        assert self.data.class_attribute_name in record, \
            "The class attribute must be present in the record."
        record = record.copy()
        self.sample_count += 1
        self.tree.train(record)