Adding new stuff

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.. include:: ../global.rst
Jedi Development
================
.. currentmodule:: jedi
.. note:: This documentation is for Jedi developers who want to improve Jedi
itself, but have no idea how Jedi works. If you want to use Jedi for
your IDE, look at the `plugin api <plugin-api.html>`_.
Introduction
------------
This page tries to address the fundamental demand for documentation of the
|jedi| interals. Understanding a dynamic language is a complex task. Especially
because type inference in Python can be a very recursive task. Therefore |jedi|
couldn't get rid of complexity. I know that **simple is better than complex**,
but unfortunately it sometimes requires complex solutions to understand complex
systems.
Since most of the Jedi internals have been written by me (David Halter), this
introduction will be written mostly by me, because no one else understands to
the same level how Jedi works. Actually this is also the reason for exactly this
part of the documentation. To make multiple people able to edit the Jedi core.
In five chapters I'm trying to describe the internals of |jedi|:
- :ref:`The Jedi Core <core>`
- :ref:`Core Extensions <core-extensions>`
- :ref:`Imports & Modules <imports-modules>`
- :ref:`Caching & Recursions <caching-recursions>`
- :ref:`Helper modules <dev-helpers>`
.. note:: Testing is not documented here, you'll find that
`right here <testing.html>`_.
.. _core:
The Jedi Core
-------------
The core of Jedi consists of three parts:
- :ref:`Parser <parser>`
- :ref:`Python code evaluation <evaluate>`
- :ref:`API <dev-api>`
Most people are probably interested in :ref:`code evaluation <evaluate>`,
because that's where all the magic happens. I need to introduce the :ref:`parser
<parser>` first, because :mod:`jedi.evaluate` uses it extensively.
.. _parser:
Parser (parser/__init__.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.parser
Parser Representation (parser/representation.py)
++++++++++++++++++++++++++++++++++++++++++++++++
.. automodule:: jedi.parser.representation
Class inheritance diagram:
.. inheritance-diagram::
SubModule
Class
Function
Lambda
Flow
ForFlow
Import
Statement
Param
Call
Array
Name
ListComprehension
:parts: 1
.. _evaluate:
Evaluation of python code (evaluate/__init__.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.evaluate
Evaluation Representation (evaluate/representation.py)
++++++++++++++++++++++++++++++++++++++++++++++++++++++
.. automodule:: jedi.evaluate.representation
.. inheritance-diagram::
Executable
Instance
InstanceElement
Class
Function
FunctionExecution
:parts: 1
.. _name_resolution:
Name resolution (evaluate/finder.py)
++++++++++++++++++++++++++++++++++++
.. automodule:: jedi.evaluate.finder
.. _dev-api:
API (api.py and api_classes.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The API has been designed to be as easy to use as possible. The API
documentation can be found `here <plugin-api.html>`_. The API itself contains
little code that needs to be mentioned here. Generally I'm trying to be
conservative with the API. I'd rather not add new API features if they are not
necessary, because it's much harder to deprecate stuff than to add it later.
.. _core-extensions:
Core Extensions
---------------
Core Extensions is a summary of the following topics:
- :ref:`Iterables & Dynamic Arrays <iterables>`
- :ref:`Dynamic Parameters <dynamic>`
- :ref:`Fast Parser <fast_parser>`
- :ref:`Docstrings <docstrings>`
- :ref:`Refactoring <refactoring>`
These topics are very important to understand what Jedi additionally does, but
they could be removed from Jedi and Jedi would still work. But slower and
without some features.
.. _iterables:
Iterables & Dynamic Arrays (evaluate/iterable.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To understand Python on a deeper level, |jedi| needs to understand some of the
dynamic features of Python, however this probably the most complicated part:
.. automodule:: jedi.evaluate.iterable
.. _dynamic:
Parameter completion (evaluate/dynamic.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.evaluate.dynamic
.. _fast_parser:
Fast Parser (parser/fast.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.parser.fast
.. _docstrings:
Docstrings (evaluate/docstrings.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.evaluate.docstrings
.. _refactoring:
Refactoring (evaluate/refactoring.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.refactoring
.. _imports-modules:
Imports & Modules
-------------------
- :ref:`Modules <modules>`
- :ref:`Builtin Modules <builtin>`
- :ref:`Imports <imports>`
.. _builtin:
Compiled Modules (evaluate/compiled.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.evaluate.compiled
.. _imports:
Imports (evaluate/imports.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.evaluate.imports
.. _caching-recursions:
Caching & Recursions
--------------------
- :ref:`Caching <cache>`
- :ref:`Recursions <recursion>`
.. _cache:
Caching (cache.py)
~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.cache
.. _recursion:
Recursions (recursion.py)
~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.evaluate.recursion
.. _dev-helpers:
Helper Modules
---------------
Most other modules are not really central to how Jedi works. They all contain
relevant code, but you if you understand the modules above, you pretty much
understand Jedi.
Python 2/3 compatibility (_compatibility.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi._compatibility

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.. include:: ../global.rst
Features and Caveats
====================
Jedi obviously supports autocompletion. It's also possible to get it working in
(:ref:`your REPL (IPython, etc.) <repl-completion>`).
Static analysis is also possible by using the command ``jedi.names``.
The Jedi Linter is currently in an alpha version and can be tested by calling
``python -m jedi linter``.
Jedi would in theory support refactoring, but we have never publicized it,
because it's not production ready. If you're interested in helping out here,
let me know. With the latest parser changes, it should be very easy to actually
make it work.
General Features
----------------
- python 2.6+ and 3.3+ support
- ignores syntax errors and wrong indentation
- can deal with complex module / function / class structures
- virtualenv support
- can infer function arguments from sphinx, epydoc and basic numpydoc docstrings,
and PEP0484-style type hints (:ref:`type hinting <type-hinting>`)
Supported Python Features
-------------------------
|jedi| supports many of the widely used Python features:
- builtins
- returns, yields, yield from
- tuple assignments / array indexing / dictionary indexing / star unpacking
- with-statement / exception handling
- ``*args`` / ``**kwargs``
- decorators / lambdas / closures
- generators / iterators
- some descriptors: property / staticmethod / classmethod
- some magic methods: ``__call__``, ``__iter__``, ``__next__``, ``__get__``,
``__getitem__``, ``__init__``
- ``list.append()``, ``set.add()``, ``list.extend()``, etc.
- (nested) list comprehensions / ternary expressions
- relative imports
- ``getattr()`` / ``__getattr__`` / ``__getattribute__``
- function annotations (py3k feature, are ignored right now, but being parsed.
I don't know what to do with them.)
- class decorators (py3k feature, are being ignored too, until I find a use
case, that doesn't work with |jedi|)
- simple/usual ``sys.path`` modifications
- ``isinstance`` checks for if/while/assert
- namespace packages (includes ``pkgutil`` and ``pkg_resources`` namespaces)
- Django / Flask / Buildout support
Unsupported Features
--------------------
Not yet implemented:
- manipulations of instances outside the instance variables without using
methods
- implicit namespace packages (Python 3.3+, `PEP 420 <https://www.python.org/dev/peps/pep-0420/>`_)
Will probably never be implemented:
- metaclasses (how could an auto-completion ever support this)
- ``setattr()``, ``__import__()``
- writing to some dicts: ``globals()``, ``locals()``, ``object.__dict__``
- evaluating ``if`` / ``while`` / ``del``
Caveats
-------
**Malformed Syntax**
Syntax errors and other strange stuff may lead to undefined behaviour of the
completion. |jedi| is **NOT** a Python compiler, that tries to correct you. It
is a tool that wants to help you. But **YOU** have to know Python, not |jedi|.
**Legacy Python 2 Features**
This framework should work for both Python 2/3. However, some things were just
not as *pythonic* in Python 2 as things should be. To keep things simple, some
older Python 2 features have been left out:
- Classes: Always Python 3 like, therefore all classes inherit from ``object``.
- Generators: No ``next()`` method. The ``__next__()`` method is used instead.
**Slow Performance**
Importing ``numpy`` can be quite slow sometimes, as well as loading the
builtins the first time. If you want to speed things up, you could write import
hooks in |jedi|, which preload stuff. However, once loaded, this is not a
problem anymore. The same is true for huge modules like ``PySide``, ``wx``,
etc.
**Security**
Security is an important issue for |jedi|. Therefore no Python code is
executed. As long as you write pure python, everything is evaluated
statically. But: If you use builtin modules (``c_builtin``) there is no other
option than to execute those modules. However: Execute isn't that critical (as
e.g. in pythoncomplete, which used to execute *every* import!), because it
means one import and no more. So basically the only dangerous thing is using
the import itself. If your ``c_builtin`` uses some strange initializations, it
might be dangerous. But if it does you're screwed anyways, because eventualy
you're going to execute your code, which executes the import.
Recipes
-------
Here are some tips on how to use |jedi| efficiently.
.. _type-hinting:
Type Hinting
~~~~~~~~~~~~
If |jedi| cannot detect the type of a function argument correctly (due to the
dynamic nature of Python), you can help it by hinting the type using
one of the following docstring/annotation syntax styles:
**PEP-0484 style**
https://www.python.org/dev/peps/pep-0484/
function annotations (python 3 only; python 2 function annotations with
comments in planned but not yet implemented)
::
def myfunction(node: ProgramNode, foo: str) -> None:
"""Do something with a ``node``.
"""
node.| # complete here
assignment, for-loop and with-statement type hints (all python versions).
Note that the type hints must be on the same line as the statement
::
x = foo() # type: int
x, y = 2, 3 # type: typing.Optional[int], typing.Union[int, str] # typing module is mostly supported
for key, value in foo.items(): # type: str, Employee # note that Employee must be in scope
pass
with foo() as f: # type: int
print(f + 3)
Most of the features in PEP-0484 are supported including the typing module
(for python < 3.5 you have to do ``pip install typing`` to use these),
and forward references.
Things that are missing (and this is not an exhaustive list; some of these
are planned, others might be hard to implement and provide little worth):
- annotating functions with comments: https://www.python.org/dev/peps/pep-0484/#suggested-syntax-for-python-2-7-and-straddling-code
- understanding ``typing.cast()``
- stub files: https://www.python.org/dev/peps/pep-0484/#stub-files
- ``typing.Callable``
- ``typing.TypeVar``
- User defined generic types: https://www.python.org/dev/peps/pep-0484/#user-defined-generic-types
**Sphinx style**
http://sphinx-doc.org/domains.html#info-field-lists
::
def myfunction(node, foo):
"""Do something with a ``node``.
:type node: ProgramNode
:param str foo: foo parameter description
"""
node.| # complete here
**Epydoc**
http://epydoc.sourceforge.net/manual-fields.html
::
def myfunction(node):
"""Do something with a ``node``.
@type node: ProgramNode
"""
node.| # complete here
**Numpydoc**
https://github.com/numpy/numpy/blob/master/doc/HOWTO_DOCUMENT.rst.txt
In order to support the numpydoc format, you need to install the `numpydoc
<https://pypi.python.org/pypi/numpydoc>`__ package.
::
def foo(var1, var2, long_var_name='hi'):
r"""A one-line summary that does not use variable names or the
function name.
...
Parameters
----------
var1 : array_like
Array_like means all those objects -- lists, nested lists,
etc. -- that can be converted to an array. We can also
refer to variables like `var1`.
var2 : int
The type above can either refer to an actual Python type
(e.g. ``int``), or describe the type of the variable in more
detail, e.g. ``(N,) ndarray`` or ``array_like``.
long_variable_name : {'hi', 'ho'}, optional
Choices in brackets, default first when optional.
...
"""
var2.| # complete here
A little history
----------------
The Star Wars Jedi are awesome. My Jedi software tries to imitate a little bit
of the precognition the Jedi have. There's even an awesome `scene
<http://www.youtube.com/watch?v=5BDO3pyavOY>`_ of Monty Python Jedis :-).
But actually the name hasn't so much to do with Star Wars. It's part of my
second name.
After I explained Guido van Rossum, how some parts of my auto-completion work,
he said (we drank a beer or two):
*"Oh, that worries me..."*
When it's finished, I hope he'll like it :-)
I actually started Jedi, because there were no good solutions available for VIM.
Most auto-completions just didn't work well. The only good solution was PyCharm.
But I like my good old VIM. Rope was never really intended to be an
auto-completion (and also I really hate project folders for my Python scripts).
It's more of a refactoring suite. So I decided to do my own version of a
completion, which would execute non-dangerous code. But I soon realized, that
this wouldn't work. So I built an extremely recursive thing which understands
many of Python's key features.
By the way, I really tried to program it as understandable as possible. But I
think understanding it might need quite some time, because of its recursive
nature.

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.. include:: ../global.rst
Installation and Configuration
==============================
You can either include |jedi| as a submodule in your text editor plugin (like
jedi-vim_ does by default), or you can install it systemwide.
.. note:: This just installs the |jedi| library, not the :ref:`editor plugins
<editor-plugins>`. For information about how to make it work with your
editor, refer to the corresponding documentation.
The preferred way
-----------------
On any system you can install |jedi| directly from the Python package index
using pip::
sudo pip install jedi
If you want to install the current development version (master branch)::
sudo pip install -e git://github.com/davidhalter/jedi.git#egg=jedi
System-wide installation via a package manager
----------------------------------------------
Arch Linux
~~~~~~~~~~
You can install |jedi| directly from official Arch Linux packages:
- `python-jedi <https://www.archlinux.org/packages/community/any/python-jedi/>`__
(Python 3)
- `python2-jedi <https://www.archlinux.org/packages/community/any/python2-jedi/>`__
(Python 2)
The specified Python version just refers to the *runtime environment* for
|jedi|. Use the Python 2 version if you're running vim (or whatever editor you
use) under Python 2. Otherwise, use the Python 3 version. But whatever version
you choose, both are able to complete both Python 2 and 3 *code*.
(There is also a packaged version of the vim plugin available: `vim-jedi at
Arch Linux<https://www.archlinux.org/packages/community/any/vim-jedi/>`__.)
Debian
~~~~~~
Debian packages are available in the `unstable repository
<http://packages.debian.org/search?keywords=python%20jedi>`__.
Others
~~~~~~
We are in the discussion of adding |jedi| to the Fedora repositories.
Manual installation from a downloaded package
---------------------------------------------
If you prefer not to use an automated package installer, you can `download
<https://github.com/davidhalter/jedi/archive/master.zip>`__ a current copy of
|jedi| and install it manually.
To install it, navigate to the directory containing `setup.py` on your console
and type::
sudo python setup.py install
Inclusion as a submodule
------------------------
If you use an editor plugin like jedi-vim_, you can simply include |jedi| as a
git submodule of the plugin directory. Vim plugin managers like Vundle_ or
Pathogen_ make it very easy to keep submodules up to date.
.. _jedi-vim: https://github.com/davidhalter/jedi-vim
.. _vundle: https://github.com/gmarik/vundle
.. _pathogen: https://github.com/tpope/vim-pathogen

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.. include:: ../global.rst
.. _plugin-api-classes:
API Return Classes
------------------
.. automodule:: jedi.api.classes
:members:
:undoc-members:

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.. include:: ../global.rst
The Plugin API
==============
.. currentmodule:: jedi
Note: This documentation is for Plugin developers, who want to improve their
editors/IDE autocompletion
If you want to use |jedi|, you first need to ``import jedi``. You then have
direct access to the :class:`.Script`. You can then call the functions
documented here. These functions return :ref:`API classes
<plugin-api-classes>`.
Deprecations
------------
The deprecation process is as follows:
1. A deprecation is announced in the next major/minor release.
2. We wait either at least a year & at least two minor releases until we remove
the deprecated functionality.
API documentation
-----------------
API Interface
~~~~~~~~~~~~~
.. automodule:: jedi.api
:members:
:undoc-members:
Examples
--------
Completions:
.. sourcecode:: python
>>> import jedi
>>> source = '''import json; json.l'''
>>> script = jedi.Script(source, 1, 19, '')
>>> script
<jedi.api.Script object at 0x2121b10>
>>> completions = script.completions()
>>> completions
[<Completion: load>, <Completion: loads>]
>>> completions[1]
<Completion: loads>
>>> completions[1].complete
'oads'
>>> completions[1].name
'loads'
Definitions / Goto:
.. sourcecode:: python
>>> import jedi
>>> source = '''def my_func():
... print 'called'
...
... alias = my_func
... my_list = [1, None, alias]
... inception = my_list[2]
...
... inception()'''
>>> script = jedi.Script(source, 8, 1, '')
>>>
>>> script.goto_assignments()
[<Definition inception=my_list[2]>]
>>>
>>> script.goto_definitions()
[<Definition def my_func>]
Related names:
.. sourcecode:: python
>>> import jedi
>>> source = '''x = 3
... if 1 == 2:
... x = 4
... else:
... del x'''
>>> script = jedi.Script(source, 5, 8, '')
>>> rns = script.related_names()
>>> rns
[<RelatedName x@3,4>, <RelatedName x@1,0>]
>>> rns[0].start_pos
(3, 4)
>>> rns[0].is_keyword
False
>>> rns[0].text
'x'

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.. include:: ../global.rst
Settings
========
.. automodule:: jedi.settings

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This file is the start of the documentation of how static analysis works.
Below is a list of parser names that are used within nodes_to_execute.
------------ cared for:
global_stmt
exec_stmt # no priority
assert_stmt
if_stmt
while_stmt
for_stmt
try_stmt
(except_clause)
with_stmt
(with_item)
(with_var)
print_stmt
del_stmt
return_stmt
raise_stmt
yield_expr
file_input
funcdef
param
old_lambdef
lambdef
import_name
import_from
(import_as_name)
(dotted_as_name)
(import_as_names)
(dotted_as_names)
(dotted_name)
classdef
comp_for
(comp_if) ?
decorator
----------- add basic
test
or_test
and_test
not_test
expr
xor_expr
and_expr
shift_expr
arith_expr
term
factor
power
atom
comparison
expr_stmt
testlist
testlist1
testlist_safe
----------- special care:
# mostly depends on how we handle the other ones.
testlist_star_expr # should probably just work with expr_stmt
star_expr
exprlist # just ignore? then names are just resolved. Strange anyway, bc expr is not really allowed in the list, typically.
----------- ignore:
suite
subscriptlist
subscript
simple_stmt
?? sliceop # can probably just be added.
testlist_comp # prob ignore and care about it with atom.
dictorsetmaker
trailer
decorators
decorated
# always execute function arguments? -> no problem with stars.
# Also arglist and argument are different in different grammars.
arglist
argument
----------- remove:
tname # only exists in current Jedi parser. REMOVE!
tfpdef # python 2: tuple assignment; python 3: annotation
vfpdef # reduced in python 3 and therefore not existing.
tfplist # not in 3
vfplist # not in 3
--------- not existing with parser reductions.
small_stmt
import_stmt
flow_stmt
compound_stmt
stmt
pass_stmt
break_stmt
continue_stmt
comp_op
augassign
old_test
typedargslist # afaik becomes [param]
varargslist # dito
vname
comp_iter
test_nocond

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.. include:: ../global.rst
Jedi Testing
============
The test suite depends on ``tox`` and ``pytest``::
pip install tox pytest
To run the tests for all supported Python versions::
tox
If you want to test only a specific Python version (e.g. Python 2.7), it's as
easy as::
tox -e py27
Tests are also run automatically on `Travis CI
<https://travis-ci.org/davidhalter/jedi/>`_.
You want to add a test for |jedi|? Great! We love that. Normally you should
write your tests as :ref:`Blackbox Tests <blackbox>`. Most tests would
fit right in there.
For specific API testing we're using simple unit tests, with a focus on a
simple and readable testing structure.
.. _blackbox:
Blackbox Tests (run.py)
~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: test.run
Refactoring Tests (refactor.py)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: test.refactor

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.. include:: ../global.rst
End User Usage
==============
If you are a not an IDE Developer, the odds are that you just want to use
|jedi| as a browser plugin or in the shell. Yes that's :ref:`also possible
<repl-completion>`!
|jedi| is relatively young and can be used in a variety of Plugins and
Software. If your Editor/IDE is not among them, recommend |jedi| to your IDE
developers.
.. _editor-plugins:
Editor Plugins
--------------
Vim:
- jedi-vim_
- YouCompleteMe_
- deoplete-jedi_
Emacs:
- Jedi.el_
- elpy_
- anaconda-mode_
Sublime Text 2/3:
- SublimeJEDI_ (ST2 & ST3)
- anaconda_ (only ST3)
SynWrite:
- SynJedi_
TextMate:
- Textmate_ (Not sure if it's actually working)
Kate:
- Kate_ version 4.13+ `supports it natively
<https://projects.kde.org/projects/kde/applications/kate/repository/entry/addons/kate/pate/src/plugins/python_autocomplete_jedi.py?rev=KDE%2F4.13>`__,
you have to enable it, though.
Visual Studio Code:
- `Python Extension`_
Atom:
- autocomplete-python_
SourceLair:
- SourceLair_
GNOME Builder:
- `GNOME Builder`_ `supports it natively
<https://git.gnome.org/browse/gnome-builder/tree/plugins/jedi>`__,
and is enabled by default.
Gedit:
- gedi_
Eric IDE:
- `Eric IDE`_ (Available as a plugin)
Web Debugger:
- wdb_
and many more!
.. _repl-completion:
Tab completion in the Python Shell
----------------------------------
There are two different options how you can use Jedi autocompletion in
your Python interpreter. One with your custom ``$HOME/.pythonrc.py`` file
and one that uses ``PYTHONSTARTUP``.
Using ``PYTHONSTARTUP``
~~~~~~~~~~~~~~~~~~~~~~~
.. automodule:: jedi.replstartup
Using a custom ``$HOME/.pythonrc.py``
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.. autofunction:: jedi.utils.setup_readline
.. _jedi-vim: https://github.com/davidhalter/jedi-vim
.. _youcompleteme: http://valloric.github.io/YouCompleteMe/
.. _deoplete-jedi: https://github.com/zchee/deoplete-jedi
.. _Jedi.el: https://github.com/tkf/emacs-jedi
.. _elpy: https://github.com/jorgenschaefer/elpy
.. _anaconda-mode: https://github.com/proofit404/anaconda-mode
.. _sublimejedi: https://github.com/srusskih/SublimeJEDI
.. _anaconda: https://github.com/DamnWidget/anaconda
.. _SynJedi: http://uvviewsoft.com/synjedi/
.. _wdb: https://github.com/Kozea/wdb
.. _TextMate: https://github.com/lawrenceakka/python-jedi.tmbundle
.. _kate: http://kate-editor.org/
.. _autocomplete-python: https://atom.io/packages/autocomplete-python
.. _SourceLair: https://www.sourcelair.com
.. _GNOME Builder: https://wiki.gnome.org/Apps/Builder/
.. _gedi: https://github.com/isamert/gedi
.. _Eric IDE: http://eric-ide.python-projects.org
.. _Python Extension: https://marketplace.visualstudio.com/items?itemName=donjayamanne.python