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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 abspath(self, path):
        '''
        Transform the path to an absolute path

        Args:
            path (string): The path to transform to an absolute path

        Returns:
            string: The absolute path to the file
        '''
        if not path.startswith(os.path.sep) or path.startswith('~'):
            path = os.path.expanduser(os.path.join(self.base_path, path))
        return path