import cdsapi

c = cdsapi.Client()

c.retrieve(
    'projections-cmip5-daily-pressure-levels',
    {
        'ensemble_member': 'r1i1p1',
        'format': 'zip',
        'experiment': 'rcp_4_5',
        'variable': [
            'u_component_of_wind', 'v_component_of_wind',
        ],
        'model': 'gfdl_esm2g',
        'period': '20460101-20501231',
    },
    'download.zip')