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#!/usr/bin/env python
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"""A simple interactive kernel that talks to a frontend over 0MQ.
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Things to do:
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* Finish implementing `raw_input`.
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* Implement `set_parent` logic. Right before doing exec, the Kernel should
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call set_parent on all the PUB objects with the message about to be executed.
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* Implement random port and security key logic.
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* Implement control messages.
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* Implement event loop and poll version.
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"""
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import __builtin__
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import sys
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import time
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import traceback
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from code import CommandCompiler
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import zmq
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from session import Session, Message, extract_header
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from completer import KernelCompleter
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class OutStream(object):
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"""A file like object that publishes the stream to a 0MQ PUB socket."""
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def __init__(self, session, pub_socket, name, max_buffer=200):
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self.session = session
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self.pub_socket = pub_socket
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self.name = name
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self._buffer = []
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self._buffer_len = 0
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self.max_buffer = max_buffer
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self.parent_header = {}
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def set_parent(self, parent):
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self.parent_header = extract_header(parent)
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def close(self):
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self.pub_socket = None
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def flush(self):
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if self.pub_socket is None:
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raise ValueError(u'I/O operation on closed file')
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else:
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if self._buffer:
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data = ''.join(self._buffer)
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content = {u'name':self.name, u'data':data}
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msg = self.session.msg(u'stream', content=content,
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parent=self.parent_header)
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print>>sys.__stdout__, Message(msg)
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self.pub_socket.send_json(msg)
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self._buffer_len = 0
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self._buffer = []
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def isattr(self):
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return False
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def next(self):
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raise IOError('Read not supported on a write only stream.')
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def read(self, size=None):
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raise IOError('Read not supported on a write only stream.')
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readline=read
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def write(self, s):
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if self.pub_socket is None:
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raise ValueError('I/O operation on closed file')
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else:
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self._buffer.append(s)
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self._buffer_len += len(s)
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self._maybe_send()
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def _maybe_send(self):
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if '\n' in self._buffer[-1]:
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self.flush()
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if self._buffer_len > self.max_buffer:
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self.flush()
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def writelines(self, sequence):
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if self.pub_socket is None:
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raise ValueError('I/O operation on closed file')
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else:
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for s in sequence:
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self.write(s)
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class DisplayHook(object):
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def __init__(self, session, pub_socket):
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self.session = session
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self.pub_socket = pub_socket
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self.parent_header = {}
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def __call__(self, obj):
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if obj is None:
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return
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__builtin__._ = obj
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msg = self.session.msg(u'pyout', {u'data':repr(obj)},
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parent=self.parent_header)
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self.pub_socket.send_json(msg)
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def set_parent(self, parent):
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self.parent_header = extract_header(parent)
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class RawInput(object):
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def __init__(self, session, socket):
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self.session = session
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self.socket = socket
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def __call__(self, prompt=None):
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msg = self.session.msg(u'raw_input')
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self.socket.send_json(msg)
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while True:
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try:
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reply = self.socket.recv_json(zmq.NOBLOCK)
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except zmq.ZMQError, e:
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if e.errno == zmq.EAGAIN:
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pass
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else:
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raise
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else:
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break
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return reply[u'content'][u'data']
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class Kernel(object):
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def __init__(self, session, reply_socket, pub_socket):
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self.session = session
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self.reply_socket = reply_socket
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self.pub_socket = pub_socket
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self.user_ns = {}
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self.history = []
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self.compiler = CommandCompiler()
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self.completer = KernelCompleter(self.user_ns)
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# Build dict of handlers for message types
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self.handlers = {}
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for msg_type in ['execute_request', 'complete_request']:
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self.handlers[msg_type] = getattr(self, msg_type)
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def abort_queue(self):
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while True:
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try:
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ident = self.reply_socket.recv(zmq.NOBLOCK)
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except zmq.ZMQError, e:
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if e.errno == zmq.EAGAIN:
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break
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else:
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assert self.reply_socket.rcvmore(), "Unexpected missing message part."
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msg = self.reply_socket.recv_json()
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print>>sys.__stdout__, "Aborting:"
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print>>sys.__stdout__, Message(msg)
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msg_type = msg['msg_type']
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reply_type = msg_type.split('_')[0] + '_reply'
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reply_msg = self.session.msg(reply_type, {'status' : 'aborted'}, msg)
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print>>sys.__stdout__, Message(reply_msg)
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self.reply_socket.send(ident,zmq.SNDMORE)
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self.reply_socket.send_json(reply_msg)
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# We need to wait a bit for requests to come in. This can probably
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# be set shorter for true asynchronous clients.
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time.sleep(0.1)
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def execute_request(self, ident, parent):
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try:
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code = parent[u'content'][u'code']
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except:
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print>>sys.__stderr__, "Got bad msg: "
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print>>sys.__stderr__, Message(parent)
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return
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pyin_msg = self.session.msg(u'pyin',{u'code':code}, parent=parent)
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self.pub_socket.send_json(pyin_msg)
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try:
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comp_code = self.compiler(code, '<zmq-kernel>')
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sys.displayhook.set_parent(parent)
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exec comp_code in self.user_ns, self.user_ns
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except:
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result = u'error'
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etype, evalue, tb = sys.exc_info()
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tb = traceback.format_exception(etype, evalue, tb)
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exc_content = {
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u'status' : u'error',
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u'traceback' : tb,
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u'etype' : unicode(etype),
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u'evalue' : unicode(evalue)
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}
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exc_msg = self.session.msg(u'pyerr', exc_content, parent)
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self.pub_socket.send_json(exc_msg)
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reply_content = exc_content
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else:
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reply_content = {'status' : 'ok'}
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reply_msg = self.session.msg(u'execute_reply', reply_content, parent)
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print>>sys.__stdout__, Message(reply_msg)
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self.reply_socket.send(ident, zmq.SNDMORE)
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self.reply_socket.send_json(reply_msg)
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if reply_msg['content']['status'] == u'error':
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self.abort_queue()
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def complete_request(self, ident, parent):
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matches = {'matches' : self.complete(parent),
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'status' : 'ok'}
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completion_msg = self.session.send(self.reply_socket, 'complete_reply',
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matches, parent, ident)
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print >> sys.__stdout__, completion_msg
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def complete(self, msg):
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return self.completer.complete(msg.content.line, msg.content.text)
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def start(self):
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while True:
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ident = self.reply_socket.recv()
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assert self.reply_socket.rcvmore(), "Unexpected missing message part."
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msg = self.reply_socket.recv_json()
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omsg = Message(msg)
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print>>sys.__stdout__
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print>>sys.__stdout__, omsg
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handler = self.handlers.get(omsg.msg_type, None)
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if handler is None:
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print >> sys.__stderr__, "UNKNOWN MESSAGE TYPE:", omsg
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else:
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handler(ident, omsg)
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def main():
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c = zmq.Context()
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ip = '127.0.0.1'
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port_base = 5575
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connection = ('tcp://%s' % ip) + ':%i'
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rep_conn = connection % port_base
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pub_conn = connection % (port_base+1)
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print >>sys.__stdout__, "Starting the kernel..."
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print >>sys.__stdout__, "XREP Channel:", rep_conn
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print >>sys.__stdout__, "PUB Channel:", pub_conn
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session = Session(username=u'kernel')
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reply_socket = c.socket(zmq.XREP)
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reply_socket.bind(rep_conn)
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pub_socket = c.socket(zmq.PUB)
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pub_socket.bind(pub_conn)
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stdout = OutStream(session, pub_socket, u'stdout')
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stderr = OutStream(session, pub_socket, u'stderr')
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sys.stdout = stdout
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sys.stderr = stderr
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display_hook = DisplayHook(session, pub_socket)
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sys.displayhook = display_hook
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kernel = Kernel(session, reply_socket, pub_socket)
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# For debugging convenience, put sleep and a string in the namespace, so we
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# have them every time we start.
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kernel.user_ns['sleep'] = time.sleep
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kernel.user_ns['s'] = 'Test string'
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print >>sys.__stdout__, "Use Ctrl-\\ (NOT Ctrl-C!) to terminate."
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kernel.start()
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if __name__ == '__main__':
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main()
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