On Thu, 08 Apr 2010 21:32:10 -0400, monkeys paw wrote:
> I was going from example and looking for something useful from the
> lambda feature. I come from C -> Perl -> Python (recent). I don't find
> lambda very useful yet.
Perhaps you feel that lambda is a special kind of object. It isn't. It's
just a short-cut for creating an anonymous function object.
f = lambda x: x+1
is almost exactly the same as:
def function(x):
return x+1
f = function
del function
The only advantages of lambda are:
(1) you can write a simple function as a one-liner; and
(2) it's an expression, so you can embed it in another expression:
list_of_functions = [math.sin, lambda x: 2*x-1, lambda x, y=1: x**y]
for func in list_of_functions:
plot(func)
The disadvantage of lambda is that you can only include a single
expression as the body of the function.
You will generally find lambdas used as callback functions, and almost
nowhere else.
--
Steven
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