code: def get_and_cache_account(self, addr):
          
  
          if addr in self.cache:
              return self.cache[addr]
          rlpdata = self.secure_trie.get(addr)
          if (
              rlpdata == trie.BLANK_NODE and len(addr) == 32
          ):  # support for hashed addresses
              rlpdata = self.trie.get(addr)
  
          if rlpdata != trie.BLANK_NODE:
              o = rlp.decode(rlpdata, Account, db=self.db, addr=addr)
          else:
              o = Account.blank_account(self.db, addr, 0)
          self.cache[addr] = o
          o._mutable = True
          o._cached_rlp = None
          return o
docs: Gets and caches an account for an addres, creates blank if not
          found.
  
          :param addr:
          :return: