def METHOD_NAME(waveform_infos, channels, records):
    '''Populate the channel and record attributes of WaveformInfo instances
    Args:
        waveform_infos (Iterable of WaveformInfo): WaveformInfo class instances
        channels (Iterable of str): Channel names
        records (Iterable of int): Record numbers
    '''
    i = 0
    for record in records:
        for channel in channels:
            waveform_infos[i].channel = channel
            waveform_infos[i].record = record
            i += 1