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Python Development Emacs Environment
Emacs Lisp Python Shell HTML Common Lisp Ruby Other
Latest commit c232058 @andreas-roehler andreas-roehler #16, async def not working
Failed to load latest commit information.
completion py-help-at-point should close buffer , #4
devel `py-fast-process' fixed
doc Docu updated
extensions Provide skeletons with directory extensions
obsolete Rope bindings moved from pdee-bindings.el into pdee-init.el
python-libs Starting to develop unittesting
scripts Further editing on
snippets/django Some yasnippets for Django templates (html-mode).
test #16, async def not working
.gitignore py-in-string-p re-write
.travis.yml travis again
COPYING added license
CREDITS py--create-new-shell sets py-exception-buffer incorrectly, lp:1456415
ChangeLog Updated readme and changelog with the new feature
EXTENSIONS keep just one PDEE main directory
INSTALL keep just one PDEE main directory
INSTALL-INFO-FILES info-lookup-symbol, lp:1281950
IPYTHON keep just one PDEE main directory
NEWS NEWS updated `py-split-window-on-execute-p' renamed `py-split-window-on-execute' added Provide Richard Stanton's comment at py-ert-function-tests.el rewrite extended `py-fast-process' fixed execute-region forms re-organized
auto-complete-pycomplete.el keep just one PDEE main directory
beg-end.el py-indent-region keep inner block, lp:1426903 inconvinient-py-shell-switch-buffers-on-execute, lp:1073986
company-pycomplete.el keep just one PDEE main directory
index.docbook keep just one PDEE main directory
makeElpa renamed: Makefile -> makeElpa
misc-utils.el keep just one PDEE main directory
pdee-completion.el Don't add hooks that operate on non-existent variables
pdee-editing.el fixes issue #29
pdee-init.el wrong-coloring, lp:1315186
pdee-pkg.el Add package metadata files for ELPA packkage format and Marmalade add…
pycomplete+.el keep just one PDEE main directory keep just one PDEE main directory
pymacs.el Reduce compiler warnings
python-abbrev-propose.el email updated
python-components-auto-fill.el auto-fill fixed
python-components-backward-forms.el Handle multiple decorators
python-components-beginning-forms.el Some cleanup
python-components-beginning-position-forms.el Set `py-install-directory' if empty
python-components-booleans-beginning-forms.el top-level booleans don't make sense as -bol suffixed
python-components-booleans-end-forms.el Set `py-install-directory' if empty
python-components-bounds-forms.el Some cleanup
python-components-comment.el `py-end-of-comment' alias `py-forward-comment'
python-components-completion_flymake.el remove obsolete, risky forms
python-components-copy-forms.el Set `py-install-directory' if empty
python-components-copy.el Set `py-install-directory' if empty
python-components-create-menu.el Menu updated
python-components-dedicated-shells.el keep just one PDEE main directory
python-components-delete-forms.el Set `py-install-directory' if empty
python-components-delete.el email updated
python-components-edit.el `py-execute-line' calls void function, lp:1492054
python-components-electric.el `py-python-shell-mode', use current process
python-components-end-forms.el Some cleanup
python-components-end-position-forms.el py--end-of-paragraph-position-bol removed
python-components-exec-forms.el executes reconsidered
python-components-execute-file.el email updated
python-components-execute-region.el Execute-region forms reconsidered
python-components-execute.el `py-fast-process' fixed
python-components-extensions.el Unused `py--match-paren-indented-empty' removed
python-components-fast-complete.el py-help-at-point should close buffer , #4
python-components-fast-forms.el `py-fast-process' fixed
python-components-foot.el Emacs 25 global-eldoc-mode, #5
python-components-forms-code.el Set `py-install-directory' if empty
python-components-forms.el Some alias moved into python-components-foot.el
python-components-forward-forms.el `py--beginning-of-line-form', hand over argument erg
python-components-help.el with-current-buffer vs. set-buffer issues
python-components-hide-show.el Set `py-install-directory' if empty
python-components-imenu.el email updated
python-components-intern.el `py-current-defun' highlight name if `py-current-defun-show' is t
python-components-kill-forms.el Set `py-install-directory' if empty
python-components-mark-forms.el Set `py-install-directory' if empty
python-components-menu.el Menu fixed
python-components-misc-forms.el `py-beginning-of-for-block', lp:1367424
python-components-mode.el #16, async def not working
python-components-move.el Detect new PEP 492 async coroutines
python-components-named-shells.el Revert "Revert "Named shell window-management, fixed""
python-components-narrow.el Set `py-install-directory' if empty
python-components-paragraph.el #17, Broken fill paragraph on comments
python-components-pdb.el with-current-buffer vs. set-buffer issues
python-components-re-forms.el Some cleanup
python-components-section-forms.el email updated
python-components-send.el Set `py-install-directory' if empty
python-components-shell-complete.el `py-indent-or-complete' , lp:1508179
python-components-shell-menu.el email updated
python-components-shift-forms.el Reduce compiler warnings
python-components-switches.el Reduce compiler warnings
python-components-unified-completion.el keep just one PDEE main directory
python-components-up-down.el `py-down-statement' minor fix
python-components-versioned.el `py-compute-indentation' minor cleanup
python-components-virtualenv.el Redundant definitions removed
python-dedicated-shells.el keep just one PDEE main directory
python-edit-forms.el `py-beginning-of-for-block', lp:1367424
python-end-forms.el `py-beginning-of-for-block', lp:1367424
python-extended-executes.el `py-section' not suitable inside extended-executes keep just one PDEE main directory
python-mode-send.el keep just one PDEE main directory
python-mode-utils.el keep just one PDEE main directory
python-named-shells.el keep just one PDEE main directory
python-shell-complete.el keep just one PDEE main directory
python-shell-install-example-buffer.el keep just one PDEE main directory `py-find-definition' fixed `py-shell-manage-windows', lp:1273902
sh-beg-end.el keep just one PDEE main directory
thing-at-point-utils.el keep just one PDEE main directory
thingatpt-python-expressions.el keep just one PDEE main directory
thingatpt-utils-base.el keep just one PDEE main directory


Put the following into your initialization file:

(setq py-install-directory “PATH/TO/PYTHON-MODE/”) (add-to-list ‘load-path py-install-directory) (require ‘python-mode)

Selecting a Python shell:

Customize default Python shell as `py-shell-name’

`py-shell-name’ might be an installed default executable as shell command `type’ would display, but also a PATH/TO/EXECUTABLE

If different flavours of Python are installed, customize py-python-command - python2 py-python3-command py-ipython-command

py-python-command-args py-python3-command-args py-ipython-command-args

You might run code by another installed (I)Python-version than default.

Normally this would happen if a shebang in buffer specifies it. Shebang precedes default py-shell-name.

In case you will run code by default-shell, ignoring shebang, set `py-force-py-shell-name-p’ to. This might be done also via menu Python/…/Switches

Another way to enforce a different shell is specifiyng a path –interactively C-u prompts for that– or using commands which end in version like `py-execute-statement-python3’ See menu Python/Interpreter/Other/Ignoring Defaults

Invoking an (I)Python interactive shell

Commands related to a specific shell start with it’s name as `ipython-complete’. Open an installed shell by


This calls py-shell with its default arguments


if DEDICATED is set to `t’, shell will get an unique name.

Install a local shell by evaluating

(defun MY-LOCAL-SHELL () (interactive) (py-shell nil DEDICATED PATH-TO-LOCAL-SHELL))

Invoking versioned Python shells in interactive mode:

M-x py-shell RET ==> ”Python” M-x python RET ==> ”Python” M-x ipython RET ==> ”IPython” M-x python3 RET ==> ”Python3

When Path/To/Executable is given C-u python RET ==> ”PTE Python

Prefix conventions

Most python-mode.el commands start with prefix `py-’

`M-x py- TAB’ displays a list of them in completion-buffer. See also commands list delivered in directory doc.

List virtualenv related `M-x virtualenv- TAB’ resp. Pymacs commands `M-x pymacs-’

Execution code

Python code might be processed by an

  • interactive Python shell (DEFAULT)
  • non-interactive Python (`py-fast-process-p’) The latter, while design for large output, seems more reliable - see also

Both processes might run in

  • session, i.e. start from possible previous state (DEFAULT)
  • dedicated, (`py-dedicated-process-p’) run in separate process

There is also

  • python-mode-v5-behavior


Access is provided to a couple of known checkers like Flake8, pep8, pylint Need to be installed for example calling “pip install pep8” from a shell command-line Get flycheck from

Displaying Output

`py-execute-…’-commands arrive in buffer created by `py-shell’. It’s name is composed WRT to Python version used, it’s path etc.

Result of commands ending “-fast” arrives in `py-fast-output-buffer’

Window management

Variables in question:

** py-keep-windows-configuration

Default is nil. When non-nil, it takes precedence over `py-split-window-on-execute’ and `py-switch-buffers-on-execute-p’ settings

Useful, if a pre-designed set of python-shells/buffers should be maintained

** py-split-window-on-execute

When non-nil split windows according to value set.

Default is ‘just-two: when code is send to interpreter, split screen into source-code buffer and current py-shell result. Other buffers will be hidden that way.

When set to `t’, python-mode tries to reuse existing windows and will split only if needed.

With ‘always, results will displayed in a new window.

** py-switch-buffers-on-execute-p

Put focus into the output buffer: this will display buffer in any case


At the end of a word TAB by default calls completion.

Auto-completion should be available via

(require ‘auto-complete-config) (ac-config-default)

or for company:

(autoload ‘company-mode “company” nil t)

There is also a Pymacs based auto-completion mode see

Either use Pymacs and `company-mode’ with `pycomplete.el’ etc. –load stuff from folder completion–

or switch `py-auto-completion-mode-p’ - which relies on `py-shell-complete’, i.e. calls the current Python process.

Extern tools like jedi-server/mode should work too.


Beside common moves like `defun’, `statement’, block called via py-end-of-…, py-beginning-… specific Python-mode edits are delivered:

`py-expression’ and `py-partial-expression’.

Statement below is considered composed of two `py-expression’

a = [‘spam’, ‘eggs’, 100, 1234]


Assigment operator and all inside comments is ignored.

`py-partial-expression’ would match six sections

a = [‘spam’, ‘eggs’, 100, 1234]


When traversing code, `py-partial-expression’ climbs down and up all levels encountered, i.e. at opening `[’ `py-expression’ would return [‘spam’, ‘eggs’, 100, 1234], while one char behind at `” it yields `’spam’,’

  • py-sexp-function, When set, it’s value is called instead of `forward-sexp’, `backward-sexp Choices are py-partial-expression, py-expression, default nil


Customize boolean `py-set-fill-column-p’

If `t’, enables use Python specific `fill-column’ according to

`py-docstring-fill-column’, default is 72

and `py-comment-fill-column, default is 79

Comment- and docstring settings might be disabled by any non-integer value, which means: do not use a different value of `fill-column’ than emacs-wide

Python and IPython

Start IPython shell after loading python-mode via M-x ipython, not from plain shell.

Executing code through IPython should work as with regular Python, also getting completions from. However, with IPython, it feels a demi-second slower.


Start with Emacs -Q from the directory where python-mode.el lives. Open python-mode.el and evaluate it.

Open a file with ending “.py”.

M-x python RET

a regular Python-shell should appear

M-x IPython RET

an IPython-shell should be opened

** pdb doesn’t work at Windows Richard Stanton commented:

Running M-x pdb doesn’t work on my Windows machine, primarily because Windows (at least using the default shell) doesn’t automatically know what to do when you give it a .py command at the command line.

For example, here’s the suggested command when I run pdb on a file c:\projects/


If I accept this, I get an error “Spawning child process: Invalid argument”

A work-around to get it to work is to replace the suggested command with

c:\python27\python -i c:/python27/Lib/ c:/projects/

(note that I not only have to add the python command, but also fully qualify the script file, since otherwise it complains it can’t find the file).

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