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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 files(self):
 """Return list of files in root directory"""

        self._printer('\tFiles Walk')
        for directory in self.directory:
            for path in os.listdir(directory):
                full_path = os.path.join(directory, path)
                if os.path.isfile(full_path):
                    if not path.startswith('.'):
                        self.filepaths.append(full_path)
        return self._get_filepaths()