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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 _dict_lookup(cls, item, **kwargs):
        '''
        Retrieves the key or value from a dict based on the item
        kwarg lookup dict to search for item
        kwarg value_lookup bool to determine if item should be compared to keys
        or values
        '''
        log.debug('item == %s', item)
        value_lookup = kwargs.get('value_lookup', False)
        if 'lookup' in kwargs:
            for k, v in six.iteritems(kwargs['lookup']):
                if value_lookup:
                    if six.text_type(v).lower() == six.text_type(item).lower():
                        log.debug('returning key %s', k)
                        return k
                else:
                    if six.text_type(k).lower() == six.text_type(item).lower():
                        log.debug('returning value %s', v)
                        return v
        return 'Invalid Value'