网络py

``` pythonimport os from os import os import pickleclass FileDescr(object): saved = [] def __init__(self, name=None): self.name = name11 def __get__(self, obj, typ=None): if self.name not in FileDescr.saved:14 raise AttributeError, \15 "%r used before assignment" % self.name1617 try:18 f = open(self.name, 'r')19 val = pickle.load(f)20 f.close()21 return val22 except(pickle.InpicklingError, IOError,23 EOFError, AttributeError,24 ImportError, IndexError), e:25 raise AttributeError, \26 "could not read %r: %s" % self.name2728 def __set__(self, obj, val):29 f = open(self.name, 'w')30 try:31 try:32 pickle.dump(val, f)33 FileDescr.saved.append(self.name)34 except (TypeError, pickle.PicklingError), e:35 raise AttributeError, \36 "could not pickle %r" % self.name37 finally:38 f.close()

`这里写代码片