14  1332 
Not exactly sure what you're looking for but you can do the following:
def dosomething(numlist):
return numlist[0] + numlist[1]
numlist = [ 5, 10]
val = dosomething(numlist)
If so, that would be somewhat pointless. It's always best to keep it
simple. It looks like the function you wrote above is very adequate for
the results you want returned.
Xah Lee wrote: is there a way to write a expression of a function with more than 1
argument?
e.g., i want a expression that's equivalent to
def f(x,y)
return x+y
Looking for lambda?
Reinhold
Xah Lee wrote: is there a way to write a expression of a function with more than 1
argument?
e.g., i want a expression that's equivalent to
def f(x,y)
return x+y
Since assignment is a statement in Python, not an expression,
and since "def f" is an assignment that binds a function
object to the name "f", you can't do exactly what you've
asked for.
On the other hand, this should be about equivalent, though
it's not merely an expression:
f = lambda x, y: x + y
lambda x, y: x + y
that's what i was looking for.
.... once i have a lambda expr, how to apply it to arguments?
e.g. in Mathematica
Function[#1+#2][a,b]
Python doc is quite confounded in it's way of organization centered
around implementation tied to hardware (as most imperative languages
are hardware-centric), as opposed to algorithm math concepts.
Xah xa*@xahlee.org http://xahlee.org/PageTwo_dir/more.html
Xah Lee wrote: once i have a expresson of a function, how to apply it to arguments?
e.g. if i have
lambda x,y:x+y
i have to applied it to a,b in my code.
OK, I'll bite.
As with any other callable, you can simply call it like this:
a = 4
b = 24
(lambda x, y: x+y)(a, b)
Of course, you could just as well simply write
a+b
instead.
Most often the lambda is not used directly, but passed to a function. A
trivial example:
def f(fn, a, b):
return fn(a, b)
f(lambda x, y: x+y, 3, 42)
--
"Codito ergo sum"
Roel Schroeven
Roel Schroeven wrote: (lambda x, y: x+y)(a, b)
Thanks. That's what i was looking for.
where in Pytho doc can one find this? or the lambda with multiple
params?
Most often the lambda is not used directly, but passed to a function.
That is because the IT morons has been throughly brainwashed by
imperative shits. (and these morons don't even know it)
i'll explain the ins and outs of expressions of functions some other
day.
Xah xa*@xahlee.org http://xahlee.org/PageTwo_dir/more.html
Xah Lee wrote: Roel Schroeven wrote:
(lambda x, y: x+y)(a, b)
Thanks. That's what i was looking for.
where in Pytho doc can one find this? or the lambda with multiple
params?
Most often the lambda is not used directly, but passed to a function.
That is because the IT morons has been throughly brainwashed by
imperative shits. (and these morons don't even know it)
i'll explain the ins and outs of expressions of functions some other
day.
After you read about them, I guess? We look forward to your
profound words on the subject.
Sheesh...
PS sorry for the rude remarks out of nowhere.
Xah
Xah Lee wrote: PS sorry for the rude remarks out of nowhere.
Xah
Wow, signs of developing inter-personal skills. I must assume that
c.l.py is having its benign influence on you too!
regards
Steve
--
Meet the Python developers and your c.l.py favorites March 23-25
Come to PyCon DC 2005 http://www.pycon.org/
Steve Holden http://www.holdenweb.com/
Xah Lee wrote: if i understand correctly, forms such as
(lambda x,y:x+y)(a,b)
can only be gained thru experience? and not documented directly
anywhere in the official docs?
The official documentation can't list every possible permutation of the
various syntactic constructs. It does explain parenthesis, the lambda
expression, and calling syntax; the particular combination of the three
that you're using can therefor be logically understood from the docs. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics
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