Work with quadkeys.
>>> quadtools.quadkey(-3.7, 42.4, 5)
'03133'
>>> quadtools.parent('031332')
'03133'
>>> quadtools.children('01')
['010', '011', '012', '013']
>>> quadtools.siblings('011')
['010', '011', '012', '013']
>>> quadtools.neighbors('032')
['021', '030', '031', '023', '032', '033', '201', '210', '211']