python -抽象那些事

>>> strs={}>>> strs['f']={}>>> strs['s']={}>>> strs['t']={}>>> me='Megnus Lie Hetland'>>> strs['f']['Megnus']=[me]>>> strs['s']['Lie']=[me]>>> strs['t']['Hetland']=[me]>>> strs['s']['Lie']['Megnus Lie Hetland']>>> my_sister='Anny Lie Hetland'>>> strs['f'].setdefault('Anny',[]).append(my_sister)>>> strs['s'].setdefault('Lie',[]).append(my_sister)>>> strs['t'].setdefault('Hetland',[]).append(my_sister)>>> strs['f']['Anny']['Anny Lie Hetland']>>> strs['s']['Lie']['Megnus Lie Hetland', 'Anny Lie Hetland']>>> strs['t']['Hetland']['Megnus Lie Hetland', 'Anny Lie Hetland']