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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 _settings_from_file(self):
 """Loads settings from file."""

        settings = load_source(
            'settings', text_type(self.user_dir.joinpath('settings.py')))
        return {key: getattr(settings, key)
                for key in const.DEFAULT_SETTINGS.keys()
                if hasattr(settings, key)}