Config Abstractor

config.py

class Config(object):
     _sources = []
     def __init__(self, sources):
         self._sources = []
         for s in sources:
             if isinstance(s, basestring):
                 _sources.append(vars(load_file(s))) #TODO: How to load a file?
             elif isinstance(s, dict):
                 _sources.append(s.copy())
             else:
                 _sources.append(vars(s))
    def __getattr__(self, key):
        for s in self._sources:
            try:
                return s[key]
            except KeyError:
                continue
         else:
             raise AttributeError

Should probably use __slots__, since vars() won't work as expected.