如何在Python中序列化哈希对象 [英] How to serialize hash objects in Python

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问题描述

如何序列化散列对象?我正在使用 shelve 存储大量对象。



层次结构:

   - 用户
- 客户
- 好友

user.py:

 输入时间
输入hashlib
from localfile import localfile
$ b $ class user(object):
_id = 0
_ip =127.0.0.1
_nick =Unnamed
_files = {}
def __init __(self,ip =127.0.0.1,nick =Unnamed):
self._id = hashlib.sha1(str(time.time() ))
self._ip = ip
self._nick = nick
def add_file(self,localfile):
self._files [localfile.hash] = localfile
def delete_file(self,localfile):
del self._files [localfile.hash]

if __name__ ==__main__:
pass

$ b

client.py:

  from用户从朋友导入用户

中导入用户
(self,ip =127.0.0.1,nick =Unnamed):
user .__ init __(self,ip, nick)
@property
def friends(self):
return self._friends
@ friends.setter
def friends(self,value):
self._friends = value
def add_friend(self,client):
self._friends.append(client)
def delete_friend(self,client):
self._friends.remove (客户端)

if __name__ ==__main__:
import shelve
$ bx = shelve.open(localfile,'c')
(朋友(127.0.0.1,Amigo2))
cliente )

x [client] = cliente
print x [client]。friends
$ b x b.close()


错误:

  facon @ facon -E1210:〜/ Documentos / workspace / test $ python client.py 
Traceback(mos t最近调用最后):
在< module>文件中的client.py,第28行,
x [client] = cliente
文件/usr/lib/python2.7/shelve.py,第132行,在__setitem__
p.dump(value)
文件/usr/lib/python2.7/copy_reg.py,第70行,在_reduce_ex
中引发TypeError,无法腌制%s对象%base .__ name__
TypeError:can not pickle HASH objects

EDITED



添加了user.py。

解决方案

由于无法序列化 HASH 具有 shelve 的对象,您将不得不以不同的方式提供相同的信息。例如,您只能保存散列的摘要。


How can I serialize hash objects?, I'm using shelve to store a lot of objects.

Hierarchy:

- user
    - client
    - friend

user.py:

import time
import hashlib
from localfile import localfile

class user(object):
    _id = 0
    _ip = "127.0.0.1"
    _nick = "Unnamed"
    _files = {}
    def __init__(self, ip="127.0.0.1", nick="Unnamed"):
        self._id = hashlib.sha1(str(time.time()))
        self._ip = ip
        self._nick = nick
    def add_file(self, localfile):
        self._files[localfile.hash] = localfile
    def delete_file(self, localfile):
        del self._files[localfile.hash]

if __name__ == "__main__":
    pass

client.py:

from user import user
from friend import friend

class client(user):
    _friends = []
    def __init__(self, ip="127.0.0.1", nick="Unnamed"):
        user.__init__(self, ip, nick)
    @property
    def friends(self):
        return self._friends
    @friends.setter
    def friends(self, value):
        self._friends = value
    def add_friend(self, client):
        self._friends.append(client)
    def delete_friend(self, client):
        self._friends.remove(client)

if __name__ == "__main__":
    import shelve

    x = shelve.open("localfile", 'c')

    cliente = client()
    cliente.add_friend(friend("127.0.0.1", "Amigo1"))
    cliente.add_friend(friend("127.0.0.1", "Amigo2"))

    x["client"] = cliente
    print x["client"].friends

    x.close()

Errors:

facon@facon-E1210:~/Documentos/workspace/test$ python client.py
Traceback (most recent call last):
  File "client.py", line 28, in <module>
    x["client"] = cliente
  File "/usr/lib/python2.7/shelve.py", line 132, in __setitem__
    p.dump(value)
  File "/usr/lib/python2.7/copy_reg.py", line 70, in _reduce_ex
    raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle HASH objects

EDITED

Added user.py.

解决方案

Since you can't serialize HASH objects with shelve, you would have to provide the same information in a different way. For example, you could only save the digest of the hash.

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