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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 prefixes_to_fns(self, prefixes: List[str]) -> Tuple[List[str], List[str]]: """ Fetches the file paths to the features files and labels files corresponding to the provided list of features"""

        # TODO Return pathlib.Paths
        feat_fns = [str(self.feat_dir / ("%s.%s.npy" % (prefix, self.feat_type)))
                    for prefix in prefixes]
        label_fns = [str(self.label_dir / ("%s.%s" % (prefix, self.label_type)))
                      for prefix in prefixes]
        return feat_fns, label_fns