title: How to call cache clear of a class method?
body: <p>I have this code:</p>
  <pre><code>class Test(CqlEngineModel):
       @classmethod
       @cql_engine_connector
       @functools.lru_cache(maxsize=1000)
       def is_not_analyzable(cls, x, y):
          if mic:
             query_result = ...
             mic_list = cls._to_list(query_result)   
             return True if mic_list else False
          else:
             return False
  </code></pre>
  <p>Outside I need to call cache_clear function, like this:</p>
  <pre><code>Test.is_not_analyzable.cache_clear()
  </code></pre>
  <p>but I have this error:</p>
  <pre><code>AttributeError: 'function' object has no attribute 'cache_clear
  </code></pre>