Default modes
There are a number of python modes for Emacs. fgallina's python.el is the python.el included in Emacs 24.2 and onwards.
 All-in-one solutions
emacs-for-python is a bundle of the above modes (and more), and it's an easy way to turn Emacs into a Python IDE.
Elpy is a collection of elisp packages for Python too.
 rope & ropemacs
rope is a library for refactoring and manipulating Python code. ropemacs is an Emacs interface to the rope library.
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.
Jedi is simple to install and it just works.
See screenshots and get the full documentation : http://tkf.github.io/emacs-jedi/released/
Jedi's official page: http://jedi.jedidjah.ch/en/latest/
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
or call M-x jedi:setup
 Code Checker
To run pep8, pylint, pyflakes and unit-tests (with nose), you can be interested in using flymake-python.
Don't forget about pylint too.
Etags (Exuberant Ctags) generates an index (or tag) file of language objects found in source files that allows these items to be quickly and easily located by a text editor or other utility. A tag signifies a language object for which an index entry is available (or, alternatively, the index entry created for that object). Etags is a multilingual implementation of ctags.
The primary use for the tags files is looking up class/method/function/constant/etc declaration/definitions. Cscope is more powerful (see below).
Generate the tags with this command at the root of your project:
find . -name "*.py" -print | etags -
it creates the file TAGS.
cscope is a much more powerful beast. While it operates on more or less the same principle (generating a file of useful metadata) it allows you do some fancier things like find all references to a symbol, see where a function is being invoked, etc (you can find definitions as well).
It is originally designed for C and C++, but thanks to version 0.3 of pycscope, pythonista can make use of it.
The following commands should get you running:
apt-get install cscope pip install pycscope # in project base dir: find . -name '*.py' > cscope.files cscope -R
now install the xcscope emacs package with ELPA and require it:
When done, you can either enable the mode with cscope-minor-mode (which will add a menu you are free to explore) or call some functions like M-x cscope-find-global-definition, M-x cscope-find-functions-calling-this-function, etc.
 Ipdb, ipython debugger
If you call ipdb, the execution will stop and give a nice ipython-looking prompt. Just add `import ipdb; ipdb.set_trace()`
You can use the following to highlight this line, and not forget it :
; Highlight the call to ipdb ; src http://pedrokroger.com/2010/07/configuring-emacs-as-a-python-ide-2/ (defun annotate-pdb () (interactive) (highlight-lines-matching-regexp "import ipdb") (highlight-lines-matching-regexp "ipdb.set_trace()")) (add-hook 'python-mode-hook 'annotate-pdb)
 pdb track
If you use emacs-for-python given above, you can track your source code while debugging with pdbtrack.
A tool to use in a non-emacs terminal would be pdbpp
 Other tools
Pymacs is an Emacs extension that enables the use of Python alongside with Emacs Lisp.
 See also
You'll be certainly interested in :
- Magit, a git interface. Emacs + git is magic : see magit
- Yasnippet, a template system: yasnippet
- virtualenvwrapper, to load a virtualenv (so than you can use it with M-x compile) (available through ELPA)
- ELPA packages
If you're running Emacs 24, check out what is available in ELPA:
- M-x list-packages
- and see flymake-pyhon-pyflakes, flymake-shell, virtualenv, abl-mode (a python TDD minor-mode), jedi (a python auto-completion for emacs), nose (easy python test-running in emacs), pyregexp, python-magic and more.