anonymous functions? class?
Erik Max Francis
max at alcyone.com
Thu Nov 15 21:41:46 CET 2001
Peter Bismuti wrote:
> I want to pass a function as an argument but don't want to have to
> define it
> I think the proper terminology for this is "anonymous".
> The way I *don't* want to do it:
> def foo():
> The way I want to do it:
> callFunction(def foo(): pass)
> Something like that. Here the function has not been named and was not
> defined outside of the call. Can this be done in Python?
Yes. Python has lambda functions for this, although there are some
restrictions: lambda functions have to take at least one argument
(otherwise what's the point), and they can only evaluate to expressions,
rather than whole statements.
>>> map(lambda x: 2*x, range(10))
[0, 2, 4, 6, 8, 10, 12, 14, 16, 18]
Erik Max Francis / max at alcyone.com / http://www.alcyone.com/max/
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