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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 _build_search_values(self, kwargs):
 """Build the search criteria dictionary. It will first try and build the values from already set attributes on the object, falling back to the passed in kwargs. :param dict kwargs: Values to build the dict from :rtype: dict """

        criteria = {}
        for key in self._search_by:
            if getattr(self, key, None):
                criteria[key] = getattr(self, key)
            elif key in kwargs and kwargs.get(key):
                criteria[key] = kwargs.get(key)
        return criteria