Jedi.el - Python auto-completion for Emacs

What is it?

Jedi.el is a Python auto-completion package for Emacs. It aims at helping your Python coding in a non-destructive way. It also helps you to find information about Python objects, such as docstring, function arguments and code location.

Quick start

Install Jedi.el via el-get, Marmalade or MELPA (see install for more info) and add this to your Emacs configuration:

(add-hook 'python-mode-hook 'jedi:setup)
(setq jedi:setup-keys t)                      ; optional
(setq jedi:complete-on-dot t)                 ; optional

If you install Jedi.el manually (BTW, you shouldn’t!), you need to add more stuff to it. See manual install section.


Jedi.el comes with a set of useful features. Here is a list of screenshots to show some of them.

Auto-completion and popup help. This is the main feature of Jedi.el. You don’t need to type any special command. Completions and help popup as you type.

Popup-style call signature help. This is useful when you don’t remember what argument to pass.

eldoc-style call signature help. This is another style of showing arguments. Use jedi:tooltip-method to configure which style to use.

Source code viewer (need jedi-direx extension).



If your completion popup is broken when width of completion candidates is wide, try the newest version of popup.el.

Jedi.el is currently tested against Emacs 24.3-devel, 24.2 and 23.1.


Jedi.el is tested against Python 2.6, 2.7 and 3.2.

Optional dependencies for automatic installation:



The easiest way to install Jedi.el is to use el-get: just do M-x el-get-install jedi. You need to have virtualenv to automatically install Python module dependencies. If your el-get does not have the recipes for Jedi.el yet, get them from this pull request.

package.el (Marmalade or MELPA)

You can install Jedi.el using package.el interface from Marmalade or MELPA. As package.el does not support installing non-elisp packages, you need to install Python part manually (see the next section).

Manual install

  1. Install EPC and auto-complete.
  2. Install Jedi.el. Download the repository of Jedi.el and add it to load-path.
  3. Install Jedi and python-epc by
    • make requirements (no need for root privileges [1]) or
    • pip install -r requirements.txt if you want to determine where to install Python modules. You need root privileges (i.e., sudo) to install it in system directory.
  4. Add (autoload 'jedi:setup "jedi" nil t) in your Emacs configuration.
[1]You need virtualenv for make requirements. It installs all requirements for Jedi EPC server in an isolated Python environment in env/ directory under the directory where jedi.el locates. Note that you don’t need to worry about if you want to use Jedi.el to complete modules in another virtualenv you made. Jedi EPC server recognize the virtualenv it is in (i.e., the environment variable VIRTUAL_ENV in your Emacs) and then add modules in that environment to its sys.path.


All you need to do is to call jedi:setup in python buffer. To do that, add the following in your Emacs configuration:

(add-hook 'python-mode-hook 'jedi:setup)

If auto-completion is all you need, use jedi:ac-setup instead:

(add-hook 'python-mode-hook 'jedi:ac-setup)

To setup recommended keybinds for Jedi.el, add this to your Emacs configuration. Note that you must set jedi:setup-keys before loading jedi.el. See its docstring (<f1> v jedi:setup-keys) for more information.:

(setq jedi:setup-keys t)


IPython integration

Sometimes it is useful to find completion using Python interpreter. To do that in a seamless manner, you can use IPython and its Emacs binding EIN (Emacs IPython Notebook). See ein:jedi-setup in the EIN manual. Using this setup, you can run auto-completion command in Jedi.el and EIN simultaneously.


function jedi:setup

Fully setup jedi.el for current buffer. It setups ac-sources (calls jedi:ac-setup) and turns jedi-mode on.

This function is intended to be called from python-mode-hook, like this:

(add-hook 'python-mode-hook 'jedi:setup)

You can also call this function as a command, to quickly test what jedi can do.

function jedi:ac-setup

Add Jedi AC sources to ac-sources.

variable (jedi:complete-on-dot nil)

Non-nil means automatically start completion after inserting a dot. To make this option work, you need to use jedi:setup instead of jedi:ac-setup to start Jedi.

variable (jedi:server-command '("python" "JEDI:SOURCE-DIR/"))

Command used to run Jedi server.

If you setup Jedi requirements using make requirements command, jedi:server-command should be automatically set to:


Otherwise, it should be set to:

'("python" "JEDI:SOURCE-DIR/")

If you want to use your favorite Python executable, set jedi:server-command using:

(setq jedi:server-command
      (list "YOUR-FAVORITE-PYTHON" jedi:server-script))

If you want to pass some arguments to the Jedi server command, use jedi:server-command.

variable (jedi:server-args nil)

Command line arguments to be appended to jedi:server-command.

If you want to add some special sys.path when starting Jedi server, do something like this:

(setq jedi:server-args
      '("--sys-path" "MY/SPECIAL/PATH"
        "--sys-path" "MY/OTHER/SPECIAL/PATH"))

If you want to include some virtualenv, do something like this. Note that actual VIRTUAL_ENV is treated automatically. Also, you need to start Jedi EPC server with the same python version that you use for the virtualenv.:

(setq jedi:server-args
      '("--virtual-env" "SOME/VIRTUAL_ENV_1"
        "--virtual-env" "SOME/VIRTUAL_ENV_2"))

To see what other arguments Jedi server can take, execute the following command:

python --help

Advanced usage

Sometimes you want to configure how Jedi server is started per buffer. To do that, you should make this variable buffer local in python-mode-hook and set it to some buffer specific variable, like this:

(defun my-jedi-server-setup ()
    (when cmds (set (make-local-variable 'jedi:server-command) cmds))
    (when args (set (make-local-variable 'jedi:server-args) args))))

(add-hook 'python-mode-hook 'my-jedi-server-setup)

Note that Jedi server run by the same command is pooled. So, there is only one Jedi server for the same set of command. If you want to check how many EPC servers are running, use the EPC GUI: M-x epc:controller. You will see a table of EPC connections for Jedi.el and other EPC applications.

If you want to start a new ad-hoc server for the current buffer, use the command jedi:start-dedicated-server.

variable (jedi:get-in-function-call-timeout 3000)

Cancel request to server for call signature after this period specified in in millisecond.

variable (jedi:get-in-function-call-delay 1000)

How long Jedi should wait before showing call signature tooltip in millisecond.

variable (jedi:tooltip-method '(pos-tip popup))

Configuration for jedi:tooltip-show. This is a list which may contain symbol(s) pos-tip and/or popup. It determines tooltip method to use. Setting this value to nil means to use minibuffer instead of tooltip.

variable (jedi:goto-definition-config '((nil nil nil) (t nil nil) (nil definition nil) (t definition nil) (nil nil t) (t nil t) (nil definition t) (t definition t)))

Configure how prefix argument modifies jedi:goto-definition behavior.

Each element of the list is arguments (list) passed to jedi:goto-definition. Note that this variable has no effect on jedi:goto-definition when it is used as a lisp function

The following setting is default (last parts are omitted). Nth element is used as the argument when N universal prefix arguments (C-u) are given.:

(setq jedi:goto-definition-config
      '((nil nil        nil)        ; C-.
        (t   nil        nil)        ; C-u C-.
        (nil definition nil)        ; C-u C-u C-.
        (t   definition nil)        ; C-u C-u C-u C-.

For example, if you want to follow “substitution path” by default, use the setting like this:

(setq jedi:goto-definition-config
      '((nil definition nil)
        (t   definition nil)
        (nil nil        nil)
        (t   nil        nil)
        (nil definition t  )
        (t   definition t  )
        (nil nil        t  )
        (t   nil        t  )))

You can rearrange the order to have most useful sets of arguments at the top.

variable (jedi:goto-definition-marker-ring-length 16)

Length of marker ring to store jedi:goto-definition call positions

variable (jedi:doc-mode 'rst-mode)

Major mode to use when showing document.

variable (jedi:doc-display-buffer 'display-buffer)

A function to be called with a buffer to show document.

variable (jedi:install-imenu nil)

[EXPERIMENTAL] If t, use Jedi to create imenu index. To use this feature, you need to install the developmental version (“dev” branch) of Jedi.

variable (jedi:imenu-create-index-function 'jedi:create-nested-imenu-index)

imenu-create-index-function for Jedi.el. It must be a function that takes no argument and return an object described in imenu--index-alist. This can be set to jedi:create-flat-imenu-index. Default is jedi:create-nested-imenu-index.


variable (jedi:setup-keys nil)

Setup recommended keybinds.

Default keybinds

<C-tab> : = jedi:key-complete
Complete code at point. (jedi:complete)
C-. : = jedi:key-goto-definition
Goto the definition of the object at point. (jedi:goto-definition)
C-c d : = jedi:key-show-doc
Goto the definition of the object at point. (jedi:show-doc)
C-c r : = jedi:key-related-names
Find related names of the object at point. (helm-jedi-related-names / anything-jedi-related-names)

When jedi:setup-keys is non-nil, recommended keybinds are set in jedi-mode-map when loading jedi.el. Therefore, you must set this value before jedi.el is loaded. As recommended usage of jedi.el is to call jedi:setup via python-mode-hook where jedi:setup is autloaded, setting jedi:setup-keys to t in you emacs setup (e.g., .emacs.d/init.el) works fine.:

(setq jedi:setup-keys t)
(add-hook 'python-mode-hook 'jedi:setup)

If you want to require jedi.el explicitly when loading Emacs, make sure to set jedi:setup-keys before loading jedi.el:

(setq jedi:setup-keys t)
(require 'jedi)

Byte compiler warns about unbound variable if you set jedi:setup-keys before loading jedi.el. The proper way to suppress this warning is the following:

(eval-when-compile (require 'jedi nil t))
(setq jedi:setup-keys t)

You can change these keybinds by changing jedi:key-complete, jedi:key-goto-definition, jedi:key-show-doc, and jedi:key-related-names. For example, default keybind for ropemacs’s rope-show-doc is same as jedi:show-doc. You can avoid collision by something like this:

(setq jedi:key-show-doc (kbd "C-c D"))
variable (jedi:key-complete (kbd "<C-tab>"))

Keybind for command jedi:complete.

variable (jedi:key-goto-definition (kbd "C-."))

Keybind for command jedi:goto-definition.

variable (jedi:key-show-doc (kbd "C-c d"))

Keybind for command jedi:show-doc.

Keybind for command helm-jedi-related-names or anything-jedi-related-names.

variable (jedi:goto-definition-pop-marker (kbd "C-,"))

Goto the last point where jedi:goto-definition was called.


function jedi:stop-server

Stop Jedi server. Use this command when you want to restart Jedi server (e.g., when you changed jedi:server-command or jedi:server-args). Jedi srever will be restarted automatically later when it is needed.

function (jedi:start-dedicated-server command)

Start Jedi server dedicated to this buffer. This is useful, for example, when you want to use different sys.path for some buffer. When invoked as an interactive command, it asks you how to start the Jedi server. You can edit the command in minibuffer to specify the way Jedi server run.

If you want to setup how Jedi server is started programmatically per-buffer/per-project basis, make jedi:server-command and jedi:server-args buffer local and set it in python-mode-hook. See also: jedi:server-args.

function (jedi:complete &rest --cl-rest--)

Complete code at point.

function jedi:get-in-function-call

Manually show call signature tooltip.

function (jedi:goto-definition &optional other-window deftype use-cache index)

Goto the definition of the object at point.

See jedi:goto-definition-config for how this function works when universal prefix arguments (C-u) are given. If numeric prefix argument(s) (e.g., M-0) are given, goto point of the INDEX-th result. Note that you cannot mix universal and numeric prefixes. It is Emacs’s limitation. If you mix both kinds of prefix, you get numeric prefix.

When used as a lisp function, popup a buffer when OTHER-WINDOW is non-nil. DEFTYPE must be either assignment (default) or definition. When USE-CACHE is non-nil, use the locations of the last invocation of this command. If INDEX is specified, goto INDEX-th result.

function jedi:goto-definition-pop-marker

Goto the last point where jedi:goto-definition was called.

function jedi:show-doc

Show the documentation of the object at point.

Find related names of the object at point using helm interface.

Find related names of the object at point using anything interface.

function jedi:toggle-debug-server

Setup jedi:server-command and jedi:server-args to debug server using pdb or ipdb.

When this command is called, it essentially execute the following code:

(setq jedi:server-command (list "cat" "jedi-port.log" )
      jedi:server-args nil)

It means to pass the port number recorded in the file jedi-port.log to EPC client.

To start Jedi server in terminal and record port to the file, use the following command:

python --port-file jedi-port.log --pdb

This command will be copied in the kill-ring (clipboard) when this command is called. You can use –ipdb instead of –pdb to use ipdb instead of pdb.

Calling this command again restores the original setting of jedi:server-command and jedi:server-args then stops the running server.


Before posting question or bug report in the issue tracker, please investigate the problem by yourself. Here is some checklist.

  1. You can try Jedi.el without installing it, by running make tryout if you have carton installed. This will install requirements for Jedi.el separated from your local setup in .emacs.d. You can also check the configuration file tryout-jedi.el to see a minimum working configuration. This is the configuration file loaded by make tryout. If you have trouble setting up Jedi.el, compare your configuration file and tryout-jedi.el.

    If you get some error during make tryout or any other make tasks, checking elpa/install.log may help you finding the problem.

    If you install carton in a different place or you don’t add it to the $PATH, you can call make like this: make CARTON=PATH/TO/bin/carton tryout. Typically, PATH/TO/bin/carton is ~/.carton/bin/carton.

    If you are too lazy to go to carton site to checkout how to install it, here is what you need to do:

    curl -fsSkL | sh
    make CARTON=$HOME/.carton/bin/carton tryout

    Note that this carton is different from the one for Perl.

  2. To make sure that jedi.el is running correctly, you can do M-x jedi:show-jedi-version. It will show the versions of the Python libraries you are using.

    This is least complex way to communicate with the Jedi server. If it doesn’t work, rest of Jedi.el functions will not work.

  3. To check that jedi:setup is called properly via python-mode-hook, run M-: jedi-mode RET in some Python file. It should return t.

  4. If you see message “auto-complete-mode is not enabled”, you might forget to setup auto-complete properly. Calling (global-auto-complete-mode t) in your Emacs configuration after loading auto-complete should solve this problem.

    “After loading” means you need to call (require 'auto-complete) (or (require 'auto-complete-config) if you need) before calling (global-auto-complete-mode t).

  5. It is possible that Jedi’s keybind conflicts with keybinds of other libraries. You can check the definition of keybind by <f1> k C-c d (or C-h instead of <f1>), for example. This one should show the help for jedi:show-doc.

    If you find other command using the keybind, you can change it by using jedi:key-show-doc, etc. See: jedi:setup-keys.

  6. If you have trouble setting keybinds, make sure that (require 'jedi) is not called anywhere before the line (setq jedi:setup-keys t).

    To check that keybind setup works, do M-: jedi-mode-map RET. It should return something like the following (formatted):

    (keymap (3 keymap (100 . jedi:show-doc))
            (67108910 . jedi:goto-definition)
            (C-tab . jedi:complete))

    Note that using (require 'jedi) is not recommended way to configure Jedi.el because it slows down your Emacs startup [2]. If you use package.el or el-get to install Jedi.el, there should be no need for adding (require 'jedi) to your configuration. See: jedi:setup-keys.

[2]But if you know what you are doing (require 'jedi) can be a good choice. For example, this way is faster to open the first Python file in an Emacs session.

How it works

Jedi.el uses jedi (an awesome Python auto-completion library) and EPC (an RPC stack for Emacs Lisp) and its Python binding to communicate with Python process. It also uses excellent Emacs auto-complete module to start completion automatically. As Jedi.el always calls Python function asynchronously (thanks to EPC), it will not block your Emacs while your are editing.


v0.1.2 (2013-05-26)


  • Package is available from Marmalade.
  • Add imenu support (see jedi:install-imenu and jedi:imenu-create-index-function). Currently it is not on by default as it needs developmental version of Jedi.
  • Add jedi:goto-definition-config configurable option.
  • Jedi.el now pools server instances. So, for example, you can create buffer-local jedi:server-args to setup project-specific Jedi server (issue-28).
  • Do not expand common part when completing on inserting dot using jedi:dot-complete.
  • Strip off newlines from candidate summary. This prevents popup to be disrupted when showing candidates summary containing newlines (e.g., json.__all__).

Contributions from:

Closed issues and pulled patches:

v0.1.1 (2012-12-01)

  • Add experimental “full-name” support [3].
  • PR-11 fixes Makefile for BSD make (thanks, @goro1080!).
  • Fix issue-9: line number sent to the server was shifted when the cursor is at the beginning of line.
  • Fix issue-10: get_in_function_call was called in non-python-mode buffer.
  • Fix issue-7: server process was killed unexpectedly.
  • Add jedi:setup-keys. You don’t need to manually add Jedi commands to python-mode-map now.

Contributions from:

Closed issues and pulled patches:

[3]jedi:get-full-name-* functions require developmental version of Jedi. See also: Request: Definition.fullname · Issue #61 · davidhalter/jedi

v0.1.0 (2012-11-09)

  • PR-8 adds ELDoc like argument highlighting (thanks, @syohex!).
  • PR-2 adds meta-data in header comment for ELPA (thanks, @syohex!).
  • PR-1 fixes Makefile for newer pip version (thanks, @L42y!).
  • First version.

Contributions from:

Closed issues and pulled patches: