0.9 series — IPython 2.3.1 documentation

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# 0.9 series

## Release 0.9.1

This release was quickly made to restore compatibility with Python 2.4, which version 0.9 accidentally broke. No new features were introduced, other than some additional testing support for internal use.

## Release 0.9

### New features

- All furl files and security certificates are now put in a read-only directory named ~/.ipython/security.
- A single function `get_ipython_dir()`, in `IPython.genutils` that determines the user’s IPython directory in a robust manner.
- Laurent’s WX application has been given a top-level script called ipython-wx, and it has received numerous fixes. We expect this code to be architecturally better integrated with Gael’s WX ‘ipython widget’ over the next few releases.
- The Editor synchronization work by Vivian De Smedt has been merged in. This code adds a number of new editor hooks to synchronize with editors under Windows.
- A new, still experimental but highly functional, WX shell by Gael Varoquaux. This work was sponsored by Enthought, and while it’s still very new, it is based on a more cleanly organized arhictecture of the various IPython components. We will continue to develop this over the next few releases as a model for GUI components that use IPython.
- Another GUI frontend, Cocoa based (Cocoa is the OSX native GUI framework), authored by Barry Wark. Currently the WX and the Cocoa ones have slightly different internal organizations, but the whole team is working on finding what the right abstraction points are for a unified codebase.
- As part of the frontend work, Barry Wark also implemented an experimental event notification system that various ipython components can use. In the next release the implications and use patterns of this system regarding the various GUI options will be worked out.
- IPython finally has a full test system, that can test docstrings with IPython-specific functionality. There are still a few pieces missing for it to be widely accessible to all users (so they can run the test suite at any time and report problems), but it now works for the developers. We are working hard on continuing to improve it, as this was probably IPython’s major Achilles heel (the lack of proper test coverage made it effectively impossible to do large-scale refactoring). The full test suite can now be run using the iptest command line program.
- The notion of a task has been completely reworked. An ITask interface has been created. This interface defines the methods that tasks need to implement. These methods are now responsible for things like submitting tasks and processing results. There are two basic task types: `IPython.kernel.task.StringTask` (this is the old Task object, but renamed) and the new `IPython.kernel.task.MapTask`, which is based on a function.
- A new interface, `IPython.kernel.mapper.IMapper` has been defined to standardize the idea of a map method. This interface has a single map method that has the same syntax as the built-in map. We have also defined a mapper factory interface that creates objects that implement `IPython.kernel.mapper.IMapper` for different controllers. Both the multiengine and task controller now have mapping capabilties.
- The parallel function capabilities have been reworks. The major changes are that i) there is now an @parallel magic that creates parallel functions, ii) the syntax for multiple variable follows that of map, iii) both the multiengine and task controller now have a parallel function implementation.
- All of the parallel computing capabilities from ipython1-dev have been merged into IPython proper. This resulted in the following new subpackages: `IPython.kernel`, `IPython.kernel.core`, `IPython.config`, `IPython.tools` and `IPython.testing`.
- As part of merging in the ipython1-dev stuff, the setup.py script and friends have been completely refactored. Now we are checking for dependencies using the approach that matplotlib uses.
- The documentation has been completely reorganized to accept the documentation from ipython1-dev.
- We have switched to using Foolscap for all of our network protocols in `IPython.kernel`. This gives us secure connections that are both encrypted and authenticated.
- We have a brand new COPYING.txt files that describes the IPython license and copyright. The biggest change is that we are putting “The IPython Development Team” as the copyright holder. We give more details about exactly what this means in this file. All developer should read this and use the new banner in all IPython source code files.
- sh profile: ./foo runs foo as system command, no need to do !./foo anymore
- String lists now support `sort(field, nums = True)` method (to easily sort system command output). Try it with `a = !ls -l ; a.sort(1, nums=1)`.
- ‘%cpaste foo’ now assigns the pasted block as string list, instead of string
- The ipcluster script now run by default with no security. This is done because the main usage of the script is for starting things on localhost. Eventually when ipcluster is able to start things on other hosts, we will put security back.
- ‘cd –foo’ searches directory history for string foo, and jumps to that dir. Last part of dir name is checked first. If no matches for that are found, look at the whole path.

### Bug fixes

- The Windows installer has been fixed. Now all IPython scripts have `.bat` versions created. Also, the Start Menu shortcuts have been updated.
- The colors escapes in the multiengine client are now turned off on win32 as they don’t print correctly.
- The `IPython.kernel.scripts.ipengine` script was exec’ing mpi_import_statement incorrectly, which was leading the engine to crash when mpi was enabled.
- A few subpackages had missing `__init__.py` files.
- The documentation is only created if Sphinx is found. Previously, the `setup.py` script would fail if it was missing.
- Greedy `cd` completion has been disabled again (it was enabled in 0.8.4) as it caused problems on certain platforms.

### Backwards incompatible changes

- The `clusterfile` options of the ipcluster command has been removed as it was not working and it will be replaced soon by something much more robust.
- The `IPython.kernel` configuration now properly find the user’s IPython directory.
- In ipapi, the `make_user_ns()` function has been replaced with `make_user_namespaces()`, to support dict subclasses in namespace creation.
- `IPython.kernel.client.Task` has been renamed `IPython.kernel.client.StringTask` to make way for new task types.
- The keyword argument style has been renamed dist in scatter, gather and map.
- Renamed the values that the rename dist keyword argument can have from ‘basic’ to ‘b’.
- IPython has a larger set of dependencies if you want all of its capabilities. See the setup.py script for details.
- The constructors for `IPython.kernel.client.MultiEngineClient` and `IPython.kernel.client.TaskClient` no longer take the (ip,port) tuple. Instead they take the filename of a file that contains the FURL for that client. If the FURL file is in your IPYTHONDIR, it will be found automatically and the constructor can be left empty.
- The asynchronous clients in `IPython.kernel.asyncclient` are now created using the factory functions `get_multiengine_client()` and `get_task_client()`. These return a Deferred to the actual client.
- The command line options to ipcontroller and ipengine have changed to reflect the new Foolscap network protocol and the FURL files. Please see the help for these scripts for details.
- The configuration files for the kernel have changed because of the Foolscap stuff. If you were using custom config files before, you should delete them and regenerate new ones.

### Changes merged in from IPython1

#### New features

- Much improved `setup.py` and `setupegg.py` scripts. Because Twisted and zope.interface are now easy installable, we can declare them as dependencies in our setupegg.py script.
- IPython is now compatible with Twisted 2.5.0 and 8.x.
- Added a new example of how to use `ipython1.kernel.asynclient`.
- Initial draft of a process daemon in `ipython1.daemon`. This has not been merged into IPython and is still in ipython1-dev.
- The `TaskController` now has methods for getting the queue status.
- The `TaskResult` objects not have information about how long the task took to run.
- We are attaching additional attributes to exceptions `(_ipython_*)` that we use to carry additional info around.
- New top-level module `asyncclient` that has asynchronous versions (that return deferreds) of the client classes. This is designed to users who want to run their own Twisted reactor.
- All the clients in `client` are now based on Twisted. This is done by running the Twisted reactor in a separate thread and using the `blockingCallFromThread()` function that is in recent versions of Twisted.
- Functions can now be pushed/pulled to/from engines using `MultiEngineClient.push_function()` and `MultiEngineClient.pull_function()`.
- Gather/scatter are now implemented in the client to reduce the work load of the controller and improve performance.
- Complete rewrite of the IPython docuementation. All of the documentation from the IPython website has been moved into docs/source as restructured text documents. PDF and HTML documentation are being generated using Sphinx.
- New developer oriented documentation: development guidelines and roadmap.
- Traditional `ChangeLog` has been changed to a more useful `changes.txt` file that is organized by release and is meant to provide something more relevant for users.

#### Bug fixes

- Created a proper `MANIFEST.in` file to create source distributions.
- Fixed a bug in the `MultiEngine` interface. Previously, multi-engine actions were being collected with a `DeferredList` with `fireononeerrback=1`. This meant that methods were returning before all engines had given their results. This was causing extremely odd bugs in certain cases. To fix this problem, we have 1) set `fireononeerrback=0` to make sure all results (or exceptions) are in before returning and 2) introduced a `CompositeError` exception that wraps all of the engine exceptions. This is a huge change as it means that users will have to catch `CompositeError` rather than the actual exception.

#### Backwards incompatible changes

- All names have been renamed to conform to the lowercase_with_underscore convention. This will require users to change references to all names like `queueStatus` to `queue_status`.
- Previously, methods like `MultiEngineClient.push()` and `MultiEngineClient.push()` used `*args` and `**kwargs`. This was becoming a problem as we weren’t able to introduce new keyword arguments into the API. Now these methods simple take a dict or sequence. This has also allowed us to get rid of the `*All` methods like `pushAll()` and `pullAll()`. These things are now handled with the `targets` keyword argument that defaults to `'all'`.
- The `MultiEngineClient.magicTargets` has been renamed to `MultiEngineClient.targets`.
- All methods in the MultiEngine interface now accept the optional keyword argument `block`.
- Renamed `RemoteController` to `MultiEngineClient` and `TaskController` to `TaskClient`.
- Renamed the top-level module from `api` to `client`.
- Most methods in the multiengine interface now raise a `CompositeError` exception that wraps the user’s exceptions, rather than just raising the raw user’s exception.
- Changed the `setupNS` and `resultNames` in the `Task` class to `push` and `pull`.

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