def _empty_info(sfreq):
    """Create an empty info dictionary"""
    from ..transforms import Transform
    _none_keys = (
        'acq_pars', 'acq_stim', 'buffer_size_sec', 'ctf_head_t', 'description',
        'dev_ctf_t', 'dig', 'experimenter',
        'file_id', 'filename', 'highpass', 'hpi_subsystem', 'line_freq',
        'lowpass', 'meas_date', 'meas_id', 'proj_id', 'proj_name',
        'subject_info', 'xplotter_layout',
    )
    _list_keys = ('bads', 'chs', 'comps', 'events', 'hpi_meas', 'hpi_results',
                  'projs')
    info = Info()
    for k in _none_keys:
        info[k] = None
    for k in _list_keys:
        info[k] = list()
    info['custom_ref_applied'] = False
    info['dev_head_t'] = Transform('meg', 'head', np.eye(4))
    info['highpass'] = 0.
    info['sfreq'] = float(sfreq)
    info['lowpass'] = 2. / info['sfreq']
    info._update_redundant()
    info._check_consistency()
    return info
dataset/ETHPy150Open mne-tools/mne-python/mne/io/meas_info.py/_empty_info/swapped operands of `/`