In [1]: archive = lp.load('/~launchpad/+archive/ubuntu/ppa')

In [2]: bpph = archive.getPublishedBinaries(binary_name='launchpad-buildd', exact_match=True)[0]

In [3]: bpph.getDailyDownloadTotals()
Out[3]:
{u'2017-11-29': 2,
 u'2017-12-04': 4,
 u'2017-12-05': 2,
 u'2017-12-09': 1,
 u'2017-12-11': 1,
 u'2017-12-12': 1}