def __init__(self, cmd, capturestderr=False, bufsize=-1):
        stderr = subprocess.PIPE if capturestderr else None
        PIPE = subprocess.PIPE
        self._popen = subprocess.Popen(cmd, bufsize=bufsize,
                                       shell=isinstance(cmd, basestring),
                                       stdin=PIPE, stdout=PIPE, stderr=stderr)
        self._setup(cmd)
The parameter 'cmd' is the shell command to execute in a
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/popen2.py/Popen3.__init__