How To Receive Pickle Via Subprocess.popen

getPickle.py import pickle import subprocess cmd = ['rsh', 'host1', 'sendPickle.py'] p = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE) stdout, stderr = p.

Solution 1:

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

Two unrelated remarks:

• 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.

• 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.

Solution 2:

@user4815162342 gives the correct answer. To make it crystal clear, here's example code showing how to retrieve the pickled object.

Note that it's a bit of an unusual case to pair dump and loads, but that's what needs to be done as p.communicate returns the string from stdout.

>>>import pickle>>>import subprocess as sp>>>cmd = ['python', 'sendPickle.py']>>>p = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.PIPE)>>>stdout, stderr = p.communicate()>>>stdout
"(dp0\nS'a'\np1\nI1\nsS'b'\np2\nI2\ns."
>>>results = pickle.loads(stdout)>>>results
{'a': 1, 'b': 2}