Understanding the Migration Process
Automatic migration of files
Where have my configuration files gone?
Finding the Location of Important Files
Data files: kernelspecs and notebook extensions
Since Jupyter does not have profiles, how do I customize it?
Changing the Jupyter notebook configuration directory
Changing the Jupyter notebook configuration file
Changing IPython’s profile using custom kernelspecs
Understanding Installation Changes
Understanding Changes in imports
The Big Split
moved IPython’s various language-agnostic components under the Jupyter
umbrella. Going forward, Jupyter will contain the language-agnostic
projects that serve many languages. IPython will continue to focus
on Python and its use with Jupyter.
This document describes what has changed, and how you may need to
modify your code or configuration when migrating from IPython version 3 to
The first time you run any jupyter command, it will perform an automatic
migration of files. The automatic migration process copies files,
instead of moving files, leaving the originals in place and the copies in the
Jupyter file locations. You can re-run the migration, if needed, by calling
jupyter migrate. Your custom configuration will be migrated automatically
and should work with Jupyter without further editing. When you update or
modify your configuration in the future, please keep in mind that the file
locations may have changed.
Also known as: “Why isn’t my configuration having any effect anymore?”
Jupyter splitting out from IPython means that the locations of some
files have moved, and Jupyter projects have not inherited everything
from how IPython did it.
When you start your first Jupyter application, the relevant configuration
files are automatically copied to their new Jupyter locations. The original
configuration files in the IPython locations have no effect on Jupyter’s
execution. If you accidentally edit your original IPython config file, you may
not see the desired effect with Jupyter now. You should check that you are
editing Jupyter’s configuration file, and you should see the expected effect
after restarting the Jupyter server.
This section provides quick reference for common locations of IPython 3 files
and the migrated Jupyter files.
Configuration files customize Jupyter to the user’s preferences.
The migrated files should all be automatically copied to their new Jupyter
locations. Here are the location changes:
To choose a directory location other than the default ~/.jupyter, set
the JUPYTER_CONFIG_DIR environment variable. You may need to run
jupyter migrate after setting the environment variable for files to be
copied to the desired directory.
Data files include files, other than configuration files, which are
user installed. Examples include kernelspecs and notebook extensions. Like
the configuration files, data files are also automatically migrated to
their new Jupyter locations.
In IPython 3, data files lived in ~/.ipython.
In Jupyter, data files use platform-appropriate locations:
OS X: ~/Library/Jupyter
Windows: the location specified in %APPDATA% environment variable
Elsewhere, $XDG_DATA_HOME is respected, with the default of
In all cases, the JUPYTER_DATA_DIR environment variable can be used to set
a location explicitly.
Data files installed system-wide (e.g. in /usr/local/share/jupyter) have
not changed. Per-user installation of data files has changed location from
.ipython to the platform-appropriate Jupyter location.
While IPython has the concept of profiles, Jupyter does not have
In IPython, profiles are collections of configuration and runtime files.
Inside the IPython directory (~/.ipython), there are directories with
names like profile_default or profile_demo. In each of these are
configuration files (ipython_config.py, ipython_notebook_config.py)
and runtime files (history.sqlite, security/kernel-*.json). Profiles
could be used to switch between configurations of IPython.
Previously, people could use commands like ipython notebook --profile demo
to set the profile for both the notebook server and the IPython kernel.
This is no longer possible in one go with Jupyter, just like it wasn’t
possible in IPython 3 for any other kernels.
ipython notebook --profile demo
If you want to change the notebook configuration, you can set the
If you just want to change the config file, you can do:
jupyter notebook --config=/path/to/myconfig.py
If you do want to change the IPython kernel’s profile, you
can’t do this at the server command-line anymore. Kernel arguments must
be changed by modifying the kernelspec. You can do this without relaunching
the server. Kernelspec changes take effect every time you start a new kernel.
However, there isn’t a great way to modify the kernelspecs.
One approach uses jupyter kernelspec list to find the
kernel.json file and then modifies it, e.g. kernels/python3/kernel.json,
by hand. Alternatively, a2km is an
experimental project that tries to make these things easier.
jupyter kernelspec list
For example, add the --profile option to a custom kernelspec under kernels/mycustom/kernel.json
(see the Jupyter kernelspec directions
"argv": ["python", "-m", "ipykernel",
"display_name": "Custom Profile Python",
You can then run Jupyter with the --kernel=mycustom command-line option and IPython
will find the appropriate profile.
See the Installing Jupyter Notebook page for more information about
installing Jupyter. Jupyter automatically migrates some things,
like Notebook extensions and kernels.
Any IPython notebook extensions should be automatically migrated as part
of the data files migration.
Notebook extensions were installed with:
ipython install-nbextension [--user] EXTENSION
Now, extensions are installed with:
jupyter nbextension install [--user] EXTENSION
The notebook extensions will be installed in a system-wide location (e.g.
/usr/local/share/jupyter/nbextensions). If doing a --user
install, the notebook extensions will go in the JUPYTER_DATA_DIR location.
Installation SHOULD NOT be done manually by guessing where the files
Kernels are installed in much the same way as notebook extensions. They will
also be automatically migrated.
Kernel specs used to be installed with:
ipython kernelspec install [--user] KERNEL
They are now installed with:
jupyter kernelspec install [--user] KERNEL
By default, kernel specs will go in a system-wide location
(e.g. /usr/local/share/jupyter/kernels). If doing a --user install,
the kernel specs will go in the JUPYTER_DATA_DIR location. Installation
SHOULD NOT be done manually by guessing where the files should go.
IPython 4.0 includes shims to manage dependencies; so, all imports that work
on IPython 3 should continue to work on IPython 4. If you find any
differences, please let us know.
Some changes include:
Jupyter and IPython 4.0
The IPython.kernel Split
IPython.kernel became two packages:
jupyter_client for the Jupyter client-side APIs.
ipykernel for Jupyter’s IPython kernel