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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 get(self, key, fallback=None):
 """ look up global config values from alot's config :param key: key to look up :type key: str :param fallback: fallback returned if key is not present :type fallback: str :returns: config value with type as specified in the spec-file """

        value = None
        if key in self._config:
            value = self._config[key]
            if isinstance(value, Section):
                value = None
        if value is None:
            value = fallback
        return value