#!/usr/bin/env python
# coding: utf-8

# # Connecting to an existing IPython kernel using the Qt Console

# ## The Frontend/Kernel Model

# The traditional IPython (`ipython`) consists of a single process that combines a terminal based UI with the process that runs the users code.
# 
# While this traditional application still exists, the modern Jupyter consists of two processes:
# 
# * Kernel: this is the process that runs the users code.
# * Frontend: this is the process that provides the user interface where the user types code and sees results.
# 
# Jupyter currently has 3 frontends:
# 
# * Terminal Console (`jupyter console`)
# * Qt Console (`jupyter qtconsole`)
# * Notebook (`jupyter notebook`)
# 
# The Kernel and Frontend communicate over a ZeroMQ/JSON based messaging protocol, which allows multiple Frontends (even of different types) to communicate with a single Kernel. This opens the door for all sorts of interesting things, such as connecting a Console or Qt Console to a Notebook's Kernel.  For example, you may want to connect a Qt console to your Notebook's Kernel and use it as a help
# browser, calling `??` on objects in the Qt console (whose pager is more flexible than the
# one in the notebook).  
# 
# This Notebook describes how you would connect another Frontend to an IPython Kernel that is associated with a Notebook.
# The commands currently given here are specific to the IPython kernel.

# ## Manual connection

# To connect another Frontend to a Kernel manually, you first need to find out the connection information for the Kernel using the `%connect_info` magic:

# In[ ]:


get_ipython().run_line_magic('connect_info', '')


# You can see that this magic displays everything you need to connect to this Notebook's Kernel.

# ## Automatic connection using a new Qt Console

# You can also start a new Qt Console connected to your current Kernel by using the `%qtconsole` magic. This will detect the necessary connection
# information and start the Qt Console for you automatically.

# In[ ]:


a = 10


# In[ ]:


get_ipython().run_line_magic('qtconsole', '')