code: def set_evict_number(self, new_evict_number, only_read=False):
          
          if not isinstance(new_evict_number, int) or new_evict_number <= 0:
              self.logger.warning(
                  'Parameter new_evict_number %s must be greater than 0 and is an integer' % new_evict_number)
              return
          self.evict_number = new_evict_number
docs: >>> cache = Cache(log_level=logging.WARNING)
          >>> cache.set_evict_number(10)
          >>> cache.evict_number
          10
          >>> cache.set_evict_number('haha')
          >>> cache.evict_number
          10