def command(self, string, **kwargs):
        return self.request('vim_command', string, **kwargs)
od.viewkeys() -> a set-like object providing a view on od's keys
dataset/ETHPy150Open neovim/python-client/neovim/api/nvim.py/Nvim.command--crossover with--dataset/ETHPy150Open PythonCharmers/python-future/docs/3rd-party-py3k-compat-code/pandas_py3k.py/_OrderedDict.viewkeys