code: def eth_getCode(self, address, default_block=BLOCK_TAG_LATEST):
          
          if isinstance(default_block, str):
              if default_block not in BLOCK_TAGS:
                  raise ValueError
          return self._call("eth_getCode", [address, default_block])
docs: TODO: documentation
  
          https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getcode
  
          NEEDS TESTING