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Use default OS shell to run system commands...
Use default OS shell to run system commands Instead of using os.system which uses /bin/sh, this uses subprocess.call (the replacement of os.system) to run the command using the default shell of the OS. With this, one can use more advanced commands for bash, zsh, ksh, ... I also edited the docstring, added comments and fixed the handling of return codes.

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displayhook.py
65 lines | 2.1 KiB | text/x-python | PythonLexer
import __builtin__
import sys
from IPython.core.displayhook import DisplayHook
from IPython.kernel.inprocess.socket import SocketABC
from IPython.utils.jsonutil import encode_images
from IPython.utils.traitlets import Instance, Dict
from session import extract_header, Session
class ZMQDisplayHook(object):
"""A simple displayhook that publishes the object's repr over a ZeroMQ
socket."""
topic=b'pyout'
def __init__(self, session, pub_socket):
self.session = session
self.pub_socket = pub_socket
self.parent_header = {}
def __call__(self, obj):
if obj is None:
return
__builtin__._ = obj
sys.stdout.flush()
sys.stderr.flush()
msg = self.session.send(self.pub_socket, u'pyout', {u'data':repr(obj)},
parent=self.parent_header, ident=self.topic)
def set_parent(self, parent):
self.parent_header = extract_header(parent)
class ZMQShellDisplayHook(DisplayHook):
"""A displayhook subclass that publishes data using ZeroMQ. This is intended
to work with an InteractiveShell instance. It sends a dict of different
representations of the object."""
topic=None
session = Instance(Session)
pub_socket = Instance(SocketABC)
parent_header = Dict({})
def set_parent(self, parent):
"""Set the parent for outbound messages."""
self.parent_header = extract_header(parent)
def start_displayhook(self):
self.msg = self.session.msg(u'pyout', {}, parent=self.parent_header)
def write_output_prompt(self):
"""Write the output prompt."""
self.msg['content']['execution_count'] = self.prompt_count
def write_format_data(self, format_dict, md_dict=None):
self.msg['content']['data'] = encode_images(format_dict)
self.msg['content']['metadata'] = md_dict
def finish_displayhook(self):
"""Finish up all displayhook activities."""
sys.stdout.flush()
sys.stderr.flush()
self.session.send(self.pub_socket, self.msg, ident=self.topic)
self.msg = None