rom tictactoe.errors import TicTacToeException
rom tictactoe.hash   import Hashable
lass HashTable(object):
   def __init__(self,table={}):
       if not isinstance(table, dict):
           raise TicTacToeException(
               'table is not a valid dictionary instance.')
       for maybe_hashable in table:
           self.verify_hashable(hashable=table[maybe_hashable])
       self.table = table
   def __getitem__(self,key):
       return self.get(hash=key,silent=False)
   def __setitem__(self,key,hashable):
       self.verify_hashable(hashable)
       if key != hashable.hash:
           raise TicTacToeException(
               'Key:{} is not the same hash as hashable hash:{}'.format(key,hashable.hash))
       self.table[key] = hashable
   def __delitem__(self,key):
       return self.delete(hash=key,silent=False)
   def get(self,hash,silent=True):
       if silent:
           return self._table.get(hash,None)
       return self.table[hash]
   def delete(self,hash,silent=True):
       hashable = self.get(hash,silent)
       if hashable is None:
           return hashable
       del self.table[hash]
       return True
   def add(self,hashable,silent=True):
       self.verify_hashable(hashable)
       self.table[hashable.hash] = hashable
       return True
   def verify_hashable(self,hashable):
       if not isinstance(hashable,Hashable):
           raise TicTacToeException(
               'hashable is not a valid Hashable instance. Instead a : ' \
               '{} type was found'.format(type(hashable)))