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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 load_file(self, path=None, env=None, silent=True, key=None):
 """Programmatically load files from ``path``. :param path: A single filename or a file list :param env: Which env to load from file (default current_env) :param silent: Should raise errors? :param key: Load a single key? """

        env = (env or self.current_env).upper()
        files = ensure_a_list(path)
        if files:
            self.logger.debug("Got %s files to process", files)
            already_loaded = set()
            for _filename in files:
                self.logger.debug("Processing file %s", _filename)
                filepath = os.path.join(self._root_path, _filename)
                self.logger.debug("File path is %s", filepath)
                # Handle possible *.globs sorted alphanumeric
                for path in sorted(glob.glob(filepath)):
                    self.logger.debug("Loading %s", path)
                    if path in already_loaded:  # pragma: no cover
                        self.logger.debug("Skipping %s, already loaded", path)
                        continue
                    settings_loader(
                        obj=self,
                        env=env,
                        silent=silent,
                        key=key,
                        filename=path,
                    )
                    already_loaded.add(path)
            if not already_loaded:
                self.logger.warning(
                    "Not able to locate the files %s to load", files
                )