code: def get(self, symbol):
          
          syms = self.try_to_get(symbol)
          if syms is None:
              raise Exception("Symbol {} does not exist".format(symbol))
          else:
              return syms
docs: Gets a Symbol based on name, which is expected to exist. 
          
          Parameters
          ----------
          symbol : str or Symbol
          
          Returns
          -------
          Symbol
          
          Raises
          ------
          Exception
              If it does not exist. Use .try_to_get(), 
              if the symbol may or may not exist.