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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, prompt_default='', prompt_help=''):
 """ Return the value for key from the environment or keyring. The keyring value is resolved from a local namespace or a global one. """

        value = super(DjSecret, self).get(key, prompt_default, prompt_help='')
        if not value and self.raise_on_none:
            error_msg = "The %s setting is undefined in the environment and djset %s" % (key, self._glob)
            raise self.raise_on_none(error_msg)
        return value