descr.py 文件源码

def __get__(self, obj, typ=None):
    '__get__() -- retrives attribute from disk'
        self.name = name
        if self.name not in FileDescr.saved:
            raise AttributeError, \
                "%r used before assignment" % self.name

    # open pickle file and load object; choke on failure
        try:
            f = open(self.name, 'r')
            val = pickle.load(f)
            f.close()
            return val
        except (pickle.UnpicklingError, IOError,
                EOFError, AttributeError,
                ImportError, IndexError), e:
            raise AttributeError, \
                "could not read %r: %s" % self.name