如何通过subprocess.Popen接收泡菜 [英] How to receive pickle via subprocess.Popen

问题描述

getPickle.py

getPickle.py

import pickle
import subprocess

cmd = ['rsh', 'host1', 'sendPickle.py']
p  = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
results = pickle.load(stdout)
print results

sendPickle.py

sendPickle.py

import pickle
import sys

to_return = {'a':1, 'b': 2}
pickle.dump(to_return, sys.stdout)

输出:

File "getPickle" line 10, in <module>
    results = pickle.load(stdout)
AttributeError: 'str' object has no attribute 'readline'

我该怎么办才能使酱汁从stdout回来?

What can I do to get pickle back from stdout?

谢谢

推荐答案

使用pickle.loads从字符串中加载泡菜. pickle.load用于从流中加载.

Use pickle.loads to load the pickle from a string. pickle.load is for loading from a stream.

两条无关的话:

• 如果您使用的是Python 2，您可能想使用import cPickle as pickle，因为C版本的速度快了许多，而且功能也一样强大.

• if you are using Python 2, you probably want to import cPickle as pickle because the C version is many time faster and just as powerful.

除非您特别想支持较旧的Python版本，否则最好在转储端使用protocol=-1来指定最新的Pickle协议，该协议比默认的最低/最旧版本更有效.

unless you specifically want to support older Python versions, it is a good idea to use protocol=-1 on the dump side in order specify the latest Pickle protocol, which is more efficient than the default lowest/oldest version.

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