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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 getlist(self, key):
 """Returns a Storage value as a list. If the value is a list it will be returned as-is. If object is None, an empty list will be returned. Otherwise, `[value]` will be returned. Example output for a query string of `?x=abc&y=abc&y=def`:: ['abc'] ['abc', 'def'] [] """

        
        value = self.get(key, [])
        if value is None or isinstance(value, (list, tuple)):
            return value
        else:
            return [value]