<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def load(self, files):
 """Load any files found into a suite. Any directories are walked and their files are added as TAP files. :returns: A ``unittest.TestSuite`` instance """

        suite = unittest.TestSuite()
        for filepath in files:
            if os.path.isdir(filepath):
                self._find_tests_in_directory(filepath, suite)
            else:
                suite.addTest(self.load_suite_from_file(filepath))
        return suite