def read_sections():
    """Read ini files and return list of pairs (name, options)"""
    config = configparser.ConfigParser()
    config.read(('requirements.ini', 'setup.cfg', 'tox.ini'))
    return [
        (
            name,
            {
                key: parse_value(key, config[name][key])
                for key in config[name]
            }
        )
        for name in config.sections()
        if 'requirements' in name
    ]