cache in python , Python

cache in python

#Title of this code
#python 2.7.8
from pprint import pprint

class SAcache:

def __init__(self,size):
            self.size = size
            self.__hash = {}
            self.__queue = []
        
        
    def put(self,cache_id,data):
            if self.__hash.__len__() == self.size:
                self.delete_leasted_accessed()
                 
            self.__hash[cache_id] = data 
            self.__queue.append(cache_id)
            
            
    def get(self,cache_id):
            if self.__hash.has_key(cache_id):
                self.__queue.remove(cache_id)
                self.__queue.append(cache_id)
                return self.__hash[cache_id]
            else:
               return "invalid cache id, get the cache from the database"    
            
            
            
    def delete_leasted_accessed(self):
            self.__queue.reverse()
            item = self.__queue.pop()
            del self.__hash[item]
            self.__queue.reverse()

c = SAcache(5)
c.put("c1","this is c1 data")
c.put("c2","this is c1 data")
c.put("c3","this is c1 data")
c.put("c4","this is c1 data")
c.put("c5","this is c1 data")
c.put("c6","this is c1 data")
pprint(c.get('c6'))
pprint(c.get('c1'))


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