'Command to start kernels'

@property
def argv(self):

    if self.default_interpreter:
        pyexec = get_python_executable()
    else:
        os.environ.pop('VIRTUAL_ENV', None)
        pyexec = CONF.get('main_interpreter', 'executable')
    if (os.name == 'nt'):
        dir_pyexec = osp.dirname(pyexec)
        pyexec_w = osp.join(dir_pyexec, 'pythonw.exe')
        if osp.isfile(pyexec_w):
            pyexec = pyexec_w
    utils_path = osp.join(self.spy_path, 'utils', 'ipython')
    kernel_cmd = [pyexec, osp.join(('%s' % utils_path), 'start_kernel.py'), '-f', '{connection_file}']
    return kernel_cmd
