def sec_as_hex(self, use_uncompressed=None):
        sec = self.sec(use_uncompressed=use_uncompressed)
        if sec is None:
            return None
        return b2h(sec)
pre-check
dataset/ETHPy150Open richardkiss/pycoin/pycoin/key/Key.py/Key.sec_as_hex--crossover with--dataset/ETHPy150Open algorhythms/LintCode/Route Between Two Nodes in Graph.py/Solution.dfs