def popen4(cmd, bufsize=-1, mode='t'):
        inst = Popen4(cmd, bufsize)
        return inst.fromchild, inst.tochild
From one document or action definition passed in by the user extract the
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/popen2.py/popen4--crossover with--dataset/ETHPy150Open hvandenb/splunk-elasticsearch/search-elasticsearch/bin/elasticsearch/helpers/__init__.py/expand_action