python实现通过shelve修改对象实例

import shelveshe = shelve.open('try.she','c')for c in 'spam':  she[c] = {c:23}  for c in she.keys():  print c,she[c]she.close()she = shelve.open('try.she','c')print she['p']she['p']['p'] = 42 #这样修改是不行，这只是修改了个临时对象print she['p']a = she['p']#给临时对象绑定个名字a['p'] = 42she['p'] = aprint she['p']

p {'p': 23}a {'a': 23}m {'m': 23}s {'s': 23}{'p': 23}#原值是这样的{'p': 23}#只是修改了临时对象{'p': 42}#绑定名字后，达到修改的目的