PEP 312 - Making lambdas implicit worries me, surely it's just the name 'lambda' that is bad...

[Jack Diederich]

As the butterfly that flapped its wings a week ago causing an ensuing
shift storm, I hereby declare the thread over.

I use this .emacs bit which was posted about a year ago in this thread.
I still type 'lambda' but it is displayed in context as

newlist = map(L x: x.a + x.b, oldlist)

#  vs the standard

newlist = map(lambda x: x.a + x.b, oldlist)

The L snuggles up to the opening paren.  Plus it isn't a real word so you
can see it without having to 'read' it.
All in all, a much quicker and more low maintenance solution than a custom
Grammar [pun very much intended].

-jackdied

;;Stefan Monnier's hack to make "lambda" display as (a greek lambda symbol)
;; EDIT - I use it to display 'L' instead

(defun pretty-lambdas ()
  (font-lock-add-keywords
   nil `(("\\<lambda\\>"
          (0 (progn (compose-region (match-beginning 0) (match-end 0)
                                    ,'"L")
                    nil))))))
(add-hook 'emacs-lisp-mode-hook 'pretty-lambdas)
(add-hook 'python-mode-hook 'pretty-lambdas)
(add-hook 'ilisp-mode-hook 'pretty-lambdas)