def __init__(self, filepaths, overrides=None, locked=False):
self.filepaths = filepaths<EOL>self._sourced_filepaths = None<EOL>self.overrides = overrides or {}<EOL>self.locked = locked<EOL>
Create a config.

        Args:
            filepaths (list of str): List of config files to load.
            overrides (dict): A dict containing settings that override all
                others. Nested settings are overridden with nested dicts.
            locked: If True, settings overrides in environment variables are
                ignored.