In [21]: for bug in b:
    print bug
    lp.bugs[bug].getNominationFor(target=lp.distributions['ubuntu'].getSeries(name_or_version='trusty')).approve()
   ....:     
1491913
1485073
1449654
1458950
1460626
1131385
1441626
1241972
913612
1366583
1446634
1045933
989588
1412937
1351591
1291950
1461618
1405349
1351591
1351591
1350821
1460626