def keys(self):
        return [k for k, v in self._headers]
Private method
dataset/ETHPy150Open kleientertainment/ds_mod_tools/pkg/win32/Python27/Lib/email/message.py/Message.keys--crossover with--dataset/ETHPy150Open veeresht/CommPy/commpy/channelcoding/convcode.py/Trellis._generate_states