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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 set_path(self, file_path):
 """ Set the path of the database. Create the file if it does not exist. """

        if not file_path:
            self.read_data = self.memory_read
            self.write_data = self.memory_write
        elif not is_valid(file_path):
            self.write_data(file_path, {})

        self.path = file_path